:getDate($date, array('locale' => $locale, 'format_type' => 'iso', 'fix_date' => true));

                    if (($calc == 'set') || ($calc == 'cmp')) {
                        --$parsed['month'];
                        --$month;
                        --$parsed['day'];
                        --$day;
                        $parsed['year'] -= 1970;
                        $year  -= 1970;
                    }
                    return $this->_assign($calc, $this->mktime(0, 0, 0, 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
                                                 $this->mktime(0, 0, 0, 1 + $month,           1 + $day,           1970 + $year,           true), $hour);
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage(), $date);
                }
                break;

            case self::DATE_FULL:
                try {
                    $format = Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'full'));
                    $parsed = Zend_Locale_Format::getDate($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));

                    if (($calc == 'set') || ($calc == 'cmp')) {
                        --$parsed['month'];
                        --$month;
                        --$parsed['day'];
                        --$day;
                        $parsed['year'] -= 1970;
                        $year  -= 1970;
                    }
                    return $this->_assign($calc, $this->mktime(0, 0, 0, 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
                                                 $this->mktime(0, 0, 0, 1 + $month,           1 + $day,           1970 + $year,           true), $hour);
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage(), $date);
                }
                break;

            case self::DATE_LONG:
                try {
                    $format = Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'long'));
                    $parsed = Zend_Locale_Format::getDate($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));

                    if (($calc == 'set') || ($calc == 'cmp')){
                        --$parsed['month'];
                        --$month;
                        --$parsed['day'];
                        --$day;
                        $parsed['year'] -= 1970;
                        $year  -= 1970;
                    }
                    return $this->_assign($calc, $this->mktime(0, 0, 0, 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
                                                 $this->mktime(0, 0, 0, 1 + $month,           1 + $day,           1970 + $year,           true), $hour);
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage(), $date);
                }
                break;

            case self::DATE_MEDIUM:
                try {
                    $format = Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'medium'));
                    $parsed = Zend_Locale_Format::getDate($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));

                    if (($calc == 'set') || ($calc == 'cmp')) {
                        --$parsed['month'];
                        --$month;
                        --$parsed['day'];
                        --$day;
                        $parsed['year'] -= 1970;
                        $year  -= 1970;
                    }
                    return $this->_assign($calc, $this->mktime(0, 0, 0, 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
                                                 $this->mktime(0, 0, 0, 1 + $month,           1 + $day,           1970 + $year,           true), $hour);
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage(), $date);
                }
                break;

            case self::DATE_SHORT:
                try {
                    $format = Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'short'));
                    $parsed = Zend_Locale_Format::getDate($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));

                    $parsed['year'] = self::getFullYear($parsed['year']);

                    if (($calc == 'set') || ($calc == 'cmp')) {
                        --$parsed['month'];
                        --$month;
                        --$parsed['day'];
                        --$day;
                        $parsed['year'] -= 1970;
                        $year  -= 1970;
                    }
                    return $this->_assign($calc, $this->mktime(0, 0, 0, 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
                                                 $this->mktime(0, 0, 0, 1 + $month,           1 + $day,           1970 + $year,           true), $hour);
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage(), $date);
                }
                break;

            case self::TIMES:
                try {
                    if ($calc != 'set') {
                        $month = 1;
                        $day   = 1;
                        $year  = 1970;
                    }
                    $parsed = Zend_Locale_Format::getTime($date, array('locale' => $locale, 'format_type' => 'iso', 'fix_date' => true));
                    return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], $month, $day, $year, true),
                                                 $this->mktime($hour,           $minute,           $second,           $month, $day, $year, true), false);
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage(), $date);
                }
                break;

            case self::TIME_FULL:
                try {
                    $format = Zend_Locale_Data::getContent($locale, 'time', array('gregorian', 'full'));
                    $parsed = Zend_Locale_Format::getTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));
                    if ($calc != 'set') {
                        $month = 1;
                        $day   = 1;
                        $year  = 1970;
                    }

                    if (!isset($parsed['second'])) {
                        $parsed['second'] = 0;
                    }

                    return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], $month, $day, $year, true),
                                                 $this->mktime($hour,           $minute,           $second,           $month, $day, $year, true), false);
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage(), $date);
                }
                break;

            case self::TIME_LONG:
                try {
                    $format = Zend_Locale_Data::getContent($locale, 'time', array('gregorian', 'long'));
                    $parsed = Zend_Locale_Format::getTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));
                    if ($calc != 'set') {
                        $month = 1;
                        $day   = 1;
                        $year  = 1970;
                    }
                    return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], $month, $day, $year, true),
                                                 $this->mktime($hour,           $minute,           $second,           $month, $day, $year, true), false);
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage(), $date);
                }
                break;

            case self::TIME_MEDIUM:
                try {
                    $format = Zend_Locale_Data::getContent($locale, 'time', array('gregorian', 'medium'));
                    $parsed = Zend_Locale_Format::getTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));
                    if ($calc != 'set') {
                        $month = 1;
                        $day   = 1;
                        $year  = 1970;
                    }
                    return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], $month, $day, $year, true),
                                                 $this->mktime($hour,           $minute,           $second,           $month, $day, $year, true), false);
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage(), $date);
                }
                break;

            case self::TIME_SHORT:
                try {
                    $format = Zend_Locale_Data::getContent($locale, 'time', array('gregorian', 'short'));
                    $parsed = Zend_Locale_Format::getTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));
                    if ($calc != 'set') {
                        $month = 1;
                        $day   = 1;
                        $year  = 1970;
                    }

                    if (!isset($parsed['second'])) {
                        $parsed['second'] = 0;
                    }

                    return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], $month, $day, $year, true),
                                                 $this->mktime($hour,           $minute,           $second,           $month, $day, $year, true), false);
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage(), $date);
                }
                break;

            case self::DATETIME:
                try {
                    $parsed = Zend_Locale_Format::getDateTime($date, array('locale' => $locale, 'format_type' => 'iso', 'fix_date' => true));
                    if (($calc == 'set') || ($calc == 'cmp')) {
                        --$parsed['month'];
                        --$month;
                        --$parsed['day'];
                        --$day;
                        $parsed['year'] -= 1970;
                        $year  -= 1970;
                    }
                    return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
                                                 $this->mktime($hour,           $minute,           $second,           1 + $month,           1 + $day,           1970 + $year,           true), $hour);
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage(), $date);
                }
                break;

            case self::DATETIME_FULL:
                try {
                    $format = Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'full'));
                    $parsed = Zend_Locale_Format::getDateTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));

                    if (($calc == 'set') || ($calc == 'cmp')) {
                        --$parsed['month'];
                        --$month;
                        --$parsed['day'];
                        --$day;
                        $parsed['year'] -= 1970;
                        $year  -= 1970;
                    }

                    if (!isset($parsed['second'])) {
                        $parsed['second'] = 0;
                    }

                    return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
                                                 $this->mktime($hour,           $minute,           $second,           1 + $month,           1 + $day,           1970 + $year,           true), $hour);
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage(), $date);
                }
                break;

            case self::DATETIME_LONG:
                try {
                    $format = Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'long'));
                    $parsed = Zend_Locale_Format::getDateTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));

                    if (($calc == 'set') || ($calc == 'cmp')){
                        --$parsed['month'];
                        --$month;
                        --$parsed['day'];
                        --$day;
                        $parsed['year'] -= 1970;
                        $year  -= 1970;
                    }
                    return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
                                                 $this->mktime($hour,           $minute,           $second,           1 + $month,           1 + $day,           1970 + $year,           true), $hour);
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage(), $date);
                }
                break;

            case self::DATETIME_MEDIUM:
                try {
                    $format = Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'medium'));
                    $parsed = Zend_Locale_Format::getDateTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));
                    if (($calc == 'set') || ($calc == 'cmp')) {
                        --$parsed['month'];
                        --$month;
                        --$parsed['day'];
                        --$day;
                        $parsed['year'] -= 1970;
                        $year  -= 1970;
                    }
                    return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
                                                 $this->mktime($hour,           $minute,           $second,           1 + $month,           1 + $day,           1970 + $year,           true), $hour);
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage(), $date);
                }
                break;

            case self::DATETIME_SHORT:
                try {
                    $format = Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'short'));
                    $parsed = Zend_Locale_Format::getDateTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));

                    $parsed['year'] = self::getFullYear($parsed['year']);

                    if (($calc == 'set') || ($calc == 'cmp')) {
                        --$parsed['month'];
                        --$month;
                        --$parsed['day'];
                        --$day;
                        $parsed['year'] -= 1970;
                        $year  -= 1970;
                    }

                    if (!isset($parsed['second'])) {
                        $parsed['second'] = 0;
                    }

                    return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
                                                 $this->mktime($hour,           $minute,           $second,           1 + $month,           1 + $day,           1970 + $year,           true), $hour);
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage(), $date);
                }
                break;

            // ATOM and RFC_3339 are identical
            case self::ATOM:
            case self::RFC_3339:
                $result = preg_match('/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})\d{0,4}([+-]{1}\d{2}:\d{2}|Z)$/', $date, $match);
                if (!$result) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception("invalid date ($date) operand, ATOM format expected", $date);
                }

                if (($calc == 'set') || ($calc == 'cmp')) {
                    --$match[2];
                    --$month;
                    --$match[3];
                    --$day;
                    $match[1] -= 1970;
                    $year     -= 1970;
                }
                return $this->_assign($calc, $this->mktime($match[4], $match[5], $match[6], 1 + $match[2], 1 + $match[3], 1970 + $match[1], true),
                                             $this->mktime($hour,     $minute,   $second,   1 + $month,    1 + $day,      1970 + $year,     true), false);
                break;

            case self::COOKIE:
                $result = preg_match("/^\w{6,9},\s(\d{2})-(\w{3})-(\d{2})\s(\d{2}):(\d{2}):(\d{2})\s.{3,20}$/", $date, $match);
                if (!$result) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception("invalid date ($date) operand, COOKIE format expected", $date);
                }
                $matchStartPos = iconv_strpos($match[0], ' ', 0, 'UTF-8') + 1;
                $match[0] = iconv_substr($match[0],
                                         $matchStartPos,
                                         iconv_strlen($match[0], 'UTF-8') - $matchStartPos,
                                         'UTF-8');

                $months    = $this->_getDigitFromName($match[2]);
                $match[3] = self::getFullYear($match[3]);

                if (($calc == 'set') || ($calc == 'cmp')) {
                    --$months;
                    --$month;
                    --$match[1];
                    --$day;
                    $match[3] -= 1970;
                    $year     -= 1970;
                }
                return $this->_assign($calc, $this->mktime($match[4], $match[5], $match[6], 1 + $months, 1 + $match[1], 1970 + $match[3], true),
                                             $this->mktime($hour,     $minute,   $second,   1 + $month,  1 + $day,      1970 + $year,     true), false);
                break;

            case self::RFC_822:
            case self::RFC_1036:
                // new RFC 822 format, identical to RFC 1036 standard
                $result = preg_match('/^\w{0,3},{0,1}\s{0,1}(\d{1,2})\s(\w{3})\s(\d{2})\s(\d{2}):(\d{2}):{0,1}(\d{0,2})\s([+-]{1}\d{4}|\w{1,20})$/', $date, $match);
                if (!$result) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception("invalid date ($date) operand, RFC 822 date format expected", $date);
                }

                $months    = $this->_getDigitFromName($match[2]);
                $match[3] = self::getFullYear($match[3]);

                if (($calc == 'set') || ($calc == 'cmp')) {
                    --$months;
                    --$month;
                    --$match[1];
                    --$day;
                    $match[3] -= 1970;
                    $year     -= 1970;
                }
                return $this->_assign($calc, $this->mktime($match[4], $match[5], $match[6], 1 + $months, 1 + $match[1], 1970 + $match[3], false),
                                             $this->mktime($hour,     $minute,   $second,   1 + $month,  1 + $day,      1970 + $year,     false), false);
                break;

            case self::RFC_850:
                $result = preg_match('/^\w{6,9},\s(\d{2})-(\w{3})-(\d{2})\s(\d{2}):(\d{2}):(\d{2})\s.{3,21}$/', $date, $match);
                if (!$result) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception("invalid date ($date) operand, RFC 850 date format expected", $date);
                }

                $months    = $this->_getDigitFromName($match[2]);
                $match[3] = self::getFullYear($match[3]);

                if (($calc == 'set') || ($calc == 'cmp')) {
                    --$months;
                    --$month;
                    --$match[1];
                    --$day;
                    $match[3] -= 1970;
                    $year     -= 1970;
                }
                return $this->_assign($calc, $this->mktime($match[4], $match[5], $match[6], 1 + $months, 1 + $match[1], 1970 + $match[3], true),
                                             $this->mktime($hour,     $minute,   $second,   1 + $month,  1 + $day,      1970 + $year,     true), false);
                break;

            case self::RFC_1123:
                $result = preg_match('/^\w{0,3},{0,1}\s{0,1}(\d{1,2})\s(\w{3})\s(\d{2,4})\s(\d{2}):(\d{2}):{0,1}(\d{0,2})\s([+-]{1}\d{4}|\w{1,20})$/', $date, $match);
                if (!$result) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception("invalid date ($date) operand, RFC 1123 date format expected", $date);
                }

                $months  = $this->_getDigitFromName($match[2]);

                if (($calc == 'set') || ($calc == 'cmp')) {
                    --$months;
                    --$month;
                    --$match[1];
                    --$day;
                    $match[3] -= 1970;
                    $year     -= 1970;
                }
                return $this->_assign($calc, $this->mktime($match[4], $match[5], $match[6], 1 + $months, 1 + $match[1], 1970 + $match[3], true),
                                             $this->mktime($hour,     $minute,   $second,   1 + $month,  1 + $day,      1970 + $year,     true), false);
                break;

            case self::RSS:
                $result = preg_match('/^\w{3},\s(\d{2})\s(\w{3})\s(\d{2,4})\s(\d{1,2}):(\d{2}):(\d{2})\s.{1,21}$/', $date, $match);
                if (!$result) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception("invalid date ($date) operand, RSS date format expected", $date);
                }

                $months  = $this->_getDigitFromName($match[2]);
                $match[3] = self::getFullYear($match[3]);

                if (($calc == 'set') || ($calc == 'cmp')) {
                    --$months;
                    --$month;
                    --$match[1];
                    --$day;
                    $match[3] -= 1970;
                    $year  -= 1970;
                }
                return $this->_assign($calc, $this->mktime($match[4], $match[5], $match[6], 1 + $months, 1 + $match[1], 1970 + $match[3], true),
                                             $this->mktime($hour,     $minute,   $second,   1 + $month,  1 + $day,      1970 + $year,     true), false);
                break;

            case self::W3C:
                $result = preg_match('/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})[+-]{1}\d{2}:\d{2}$/', $date, $match);
                if (!$result) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception("invalid date ($date) operand, W3C date format expected", $date);
                }

                if (($calc == 'set') || ($calc == 'cmp')) {
                    --$match[2];
                    --$month;
                    --$match[3];
                    --$day;
                    $match[1] -= 1970;
                    $year     -= 1970;
                }
                return $this->_assign($calc, $this->mktime($match[4], $match[5], $match[6], 1 + $match[2], 1 + $match[3], 1970 + $match[1], true),
                                             $this->mktime($hour,     $minute,   $second,   1 + $month,    1 + $day,      1970 + $year,     true), false);
                break;

            default:
                if (!is_numeric($date) || !empty($part)) {
                    try {
                        if (self::$_options['format_type'] == 'php') {
                            $part = Zend_Locale_Format::convertPhpToIsoFormat($part);
                        }
                        if (empty($part)) {
                            $part  = Zend_Locale_Format::getDateFormat($locale) . " ";
                            $part .= Zend_Locale_Format::getTimeFormat($locale);
                        }
                        $parsed = Zend_Locale_Format::getDate($date, array('date_format' => $part, 'locale' => $locale, 'fix_date' => true, 'format_type' => 'iso'));
                        if ((strpos(strtoupper($part), 'YY') !== false) and (strpos(strtoupper($part), 'YYYY') === false)) {
                            $parsed['year'] = self::getFullYear($parsed['year']);
                        }
                        if (($calc == 'set') || ($calc == 'cmp')) {
                            if (isset($parsed['month'])) {
                                --$parsed['month'];
                            } else {
                                $parsed['month'] = 0;
                            }
                            if (isset($parsed['day'])) {
                                --$parsed['day'];
                            } else {
                                $parsed['day'] = 0;
                            }
                            if (isset($parsed['year'])) {
                                $parsed['year'] -= 1970;
                            } else {
                                $parsed['year'] = 0;
                            }
                        }
                        return $this->_assign($calc, $this->mktime(
                            isset($parsed['hour']) ? $parsed['hour'] : 0,
                            isset($parsed['minute']) ? $parsed['minute'] : 0,
                            isset($parsed['second']) ? $parsed['second'] : 0,
                            1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'],
                            false), $this->getUnixTimestamp(), false);
                    } catch (Zend_Locale_Exception $e) {
                        if (!is_numeric($date)) {
                            require_once 'Zend/Date/Exception.php';
                            throw new Zend_Date_Exception($e->getMessage(), $date);
                        }
                    }
                }
                return $this->_assign($calc, $date, $this->getUnixTimestamp(), false);
                break;
        }
    }

    /**
     * Returns true when both date objects or date parts are equal.
     * For example:
     * 15.May.2000 <-> 15.June.2000 Equals only for Day or Year... all other will return false
     *
     * @param  string|integer|array|Zend_Date  $date    Date or datepart to equal with
     * @param  string                          $part    OPTIONAL Part of the date to compare, if null the timestamp is used
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return boolean
     * @throws Zend_Date_Exception
     */
    public function equals($date, $part = null, $locale = null)
    {
        $result = $this->compare($date, $part, $locale);

        if ($result == 0) {
            return true;
        }
        return false;
    }

    /**
     * Returns if the given date or datepart is earlier
     * For example:
     * 15.May.2000 <-> 13.June.1999 will return true for day, year and date, but not for month
     *
     * @param  string|integer|array|Zend_Date  $date    Date or datepart to compare with
     * @param  string                          $part    OPTIONAL Part of the date to compare, if null the timestamp is used
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return boolean
     * @throws Zend_Date_Exception
     */
    public function isEarlier($date, $part = null, $locale = null)
    {
        $result = $this->compare($date, $part, $locale);

        if ($result == -1) {
            return true;
        }
        return false;
    }

    /**
     * Returns if the given date or datepart is later
     * For example:
     * 15.May.2000 <-> 13.June.1999 will return true for month but false for day, year and date
     * Returns if the given date is later
     *
     * @param  string|integer|array|Zend_Date  $date    Date or datepart to compare with
     * @param  string                          $part    OPTIONAL Part of the date to compare, if null the timestamp is used
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return boolean
     * @throws Zend_Date_Exception
     */
    public function isLater($date, $part = null, $locale = null)
    {
        $result = $this->compare($date, $part, $locale);

        if ($result == 1) {
            return true;
        }
        return false;
    }

    /**
     * Returns only the time of the date as new Zend_Date object
     * For example:
     * 15.May.2000 10:11:23 will return a dateobject equal to 01.Jan.1970 10:11:23
     *
     * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     */
    public function getTime($locale = null)
    {
        return $this->copyPart(self::TIME_MEDIUM, $locale);
    }

    /**
     * Returns the calculated time
     *
     * @param  string                    $calc    Calculation to make
     * @param  string|integer|array|Zend_Date  $time    Time to calculate with, if null the actual time is taken
     * @param  string                          $format  Timeformat for parsing input
     * @param  string|Zend_Locale              $locale  Locale for parsing input
     * @return integer|Zend_Date  new time
     * @throws Zend_Date_Exception
     */
    private function _time($calc, $time, $format, $locale)
    {
        if ($time === null) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception('parameter $time must be set, null is not allowed');
        }

        if ($time instanceof Zend_Date) {
            // extract time from object
            $time = $time->get('HH:mm:ss');
        } else {
            if (is_array($time)) {
                if ((isset($time['hour']) === true) or (isset($time['minute']) === true) or
                    (isset($time['second']) === true)) {
                    $parsed = $time;
                } else {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception("no hour, minute or second given in array");
                }
            } else {
                if (self::$_options['format_type'] == 'php') {
                    $format = Zend_Locale_Format::convertPhpToIsoFormat($format);
                }
                try {
                    if ($locale === null) {
                        $locale = $this->getLocale();
                    }

                    $parsed = Zend_Locale_Format::getTime($time, array('date_format' => $format, 'locale' => $locale, 'format_type' => 'iso'));
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage());
                }
            }
            $time  = str_pad($parsed['hour'], 2, '0', STR_PAD_LEFT) . ":";
            $time .= str_pad($parsed['minute'], 2, '0', STR_PAD_LEFT) . ":";
            $time .= str_pad($parsed['second'], 2, '0', STR_PAD_LEFT);
        }

        $return = $this->_calcdetail($calc, $time, self::TIMES, 'de');
        if ($calc != 'cmp') {
            return $this;
        }
        return $return;
    }


    /**
     * Sets a new time for the date object. Format defines how to parse the time string.
     * Also a complete date can be given, but only the time is used for setting.
     * For example: dd.MMMM.yyTHH:mm' and 'ss sec'-> 10.May.07T25:11 and 44 sec => 1h11min44sec + 1 day
     * Returned is the new date object and the existing date is left as it was before
     *
     * @param  string|integer|array|Zend_Date  $time    Time to set
     * @param  string                          $format  OPTIONAL Timeformat for parsing input
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new time
     * @throws Zend_Date_Exception
     */
    public function setTime($time, $format = null, $locale = null)
    {
        return $this->_time('set', $time, $format, $locale);
    }


    /**
     * Adds a time to the existing date. Format defines how to parse the time string.
     * If only parts are given the other parts are set to 0.
     * If no format is given, the standardformat of this locale is used.
     * For example: HH:mm:ss -> 10 -> +10 hours
     *
     * @param  string|integer|array|Zend_Date  $time    Time to add
     * @param  string                          $format  OPTIONAL Timeformat for parsing input
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new time
     * @throws Zend_Date_Exception
     */
    public function addTime($time, $format = null, $locale = null)
    {
        return $this->_time('add', $time, $format, $locale);
    }


    /**
     * Subtracts a time from the existing date. Format defines how to parse the time string.
     * If only parts are given the other parts are set to 0.
     * If no format is given, the standardformat of this locale is used.
     * For example: HH:mm:ss -> 10 -> -10 hours
     *
     * @param  string|integer|array|Zend_Date  $time    Time to sub
     * @param  string                          $format  OPTIONAL Timeformat for parsing input
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new time
     * @throws Zend_Date_Exception
     */
    public function subTime($time, $format = null, $locale = null)
    {
        return $this->_time('sub', $time, $format, $locale);
    }


    /**
     * Compares the time from the existing date. Format defines how to parse the time string.
     * If only parts are given the other parts are set to default.
     * If no format us given, the standardformat of this locale is used.
     * For example: HH:mm:ss -> 10 -> 10 hours
     *
     * @param  string|integer|array|Zend_Date  $time    Time to compare
     * @param  string                          $format  OPTIONAL Timeformat for parsing input
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return integer  0 = equal, 1 = later, -1 = earlier
     * @throws Zend_Date_Exception
     */
    public function compareTime($time, $format = null, $locale = null)
    {
        return $this->_time('cmp', $time, $format, $locale);
    }

    /**
     * Returns a clone of $this, with the time part set to 00:00:00.
     *
     * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     */
    public function getDate($locale = null)
    {
        $date = $this->copyPart(self::DATE_MEDIUM, $locale);
        $date->addTimestamp($this->getGmtOffset());
        return $date;
    }

    /**
     * Returns the calculated date
     *
     * @param  string                          $calc    Calculation to make
     * @param  string|integer|array|Zend_Date  $date    Date to calculate with, if null the actual date is taken
     * @param  string                          $format  Date format for parsing
     * @param  string|Zend_Locale              $locale  Locale for parsing input
     * @return integer|Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    private function _date($calc, $date, $format, $locale)
    {
        if ($date === null) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception('parameter $date must be set, null is not allowed');
        }

        if ($date instanceof Zend_Date) {
            // extract date from object
            $date = $date->get('d.M.Y');
        } else {
            if (is_array($date)) {
                if ((isset($date['year']) === true) or (isset($date['month']) === true) or
                    (isset($date['day']) === true)) {
                    $parsed = $date;
                } else {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception("no day,month or year given in array");
                }
            } else {
                if (self::$_options['format_type'] == 'php') {
                    $format = Zend_Locale_Format::convertPhpToIsoFormat($format);
                }
                try {
                    if ($locale === null) {
                        $locale = $this->getLocale();
                    }

                    $parsed = Zend_Locale_Format::getDate($date, array('date_format' => $format, 'locale' => $locale, 'format_type' => 'iso'));
                    if ((strpos(strtoupper($format), 'YY') !== false) and (strpos(strtoupper($format), 'YYYY') === false)) {
                        $parsed['year'] = self::getFullYear($parsed['year']);
                    }
                } catch (Zend_Locale_Exception $e) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception($e->getMessage());
                }
            }
            $date  = $parsed['day'] . "." . $parsed['month'] . "." . $parsed['year'];
        }

        $return = $this->_calcdetail($calc, $date, self::DATE_MEDIUM, 'de');
        if ($calc != 'cmp') {
            return $this;
        }
        return $return;
    }


    /**
     * Sets a new date for the date object. Format defines how to parse the date string.
     * Also a complete date with time can be given, but only the date is used for setting.
     * For example: MMMM.yy HH:mm-> May.07 22:11 => 01.May.07 00:00
     * Returned is the new date object and the existing time is left as it was before
     *
     * @param  string|integer|array|Zend_Date  $date    Date to set
     * @param  string                          $format  OPTIONAL Date format for parsing
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return integer|Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function setDate($date, $format = null, $locale = null)
    {
        return $this->_date('set', $date, $format, $locale);
    }


    /**
     * Adds a date to the existing date object. Format defines how to parse the date string.
     * If only parts are given the other parts are set to 0.
     * If no format is given, the standardformat of this locale is used.
     * For example: MM.dd.YYYY -> 10 -> +10 months
     *
     * @param  string|integer|array|Zend_Date  $date    Date to add
     * @param  string                          $format  OPTIONAL Date format for parsing input
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function addDate($date, $format = null, $locale = null)
    {
        return $this->_date('add', $date, $format, $locale);
    }


    /**
     * Subtracts a date from the existing date object. Format defines how to parse the date string.
     * If only parts are given the other parts are set to 0.
     * If no format is given, the standardformat of this locale is used.
     * For example: MM.dd.YYYY -> 10 -> -10 months
     * Be aware: Subtracting 2 months is not equal to Adding -2 months !!!
     *
     * @param  string|integer|array|Zend_Date  $date    Date to sub
     * @param  string                          $format  OPTIONAL Date format for parsing input
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function subDate($date, $format = null, $locale = null)
    {
        return $this->_date('sub', $date, $format, $locale);
    }


    /**
     * Compares the date from the existing date object, ignoring the time.
     * Format defines how to parse the date string.
     * If only parts are given the other parts are set to 0.
     * If no format is given, the standardformat of this locale is used.
     * For example: 10.01.2000 => 10.02.1999 -> false
     *
     * @param  string|integer|array|Zend_Date  $date    Date to compare
     * @param  string                          $format  OPTIONAL Date format for parsing input
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function compareDate($date, $format = null, $locale = null)
    {
        return $this->_date('cmp', $date, $format, $locale);
    }


    /**
     * Returns the full ISO 8601 date from the date object.
     * Always the complete ISO 8601 specifiction is used. If an other ISO date is needed
     * (ISO 8601 defines several formats) use toString() instead.
     * This function does not return the ISO date as object. Use copy() instead.
     *
     * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
     * @return string
     */
    public function getIso($locale = null)
    {
        return $this->get(self::ISO_8601, $locale);
    }


    /**
     * Sets a new date for the date object. Not given parts are set to default.
     * Only supported ISO 8601 formats are accepted.
     * For example: 050901 -> 01.Sept.2005 00:00:00, 20050201T10:00:30 -> 01.Feb.2005 10h00m30s
     * Returned is the new date object
     *
     * @param  string|integer|Zend_Date  $date    ISO Date to set
     * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
     * @return integer|Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function setIso($date, $locale = null)
    {
        return $this->_calcvalue('set', $date, 'iso', self::ISO_8601, $locale);
    }


    /**
     * Adds a ISO date to the date object. Not given parts are set to default.
     * Only supported ISO 8601 formats are accepted.
     * For example: 050901 -> + 01.Sept.2005 00:00:00, 10:00:00 -> +10h
     * Returned is the new date object
     *
     * @param  string|integer|Zend_Date  $date    ISO Date to add
     * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
     * @return integer|Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function addIso($date, $locale = null)
    {
        return $this->_calcvalue('add', $date, 'iso', self::ISO_8601, $locale);
    }


    /**
     * Subtracts a ISO date from the date object. Not given parts are set to default.
     * Only supported ISO 8601 formats are accepted.
     * For example: 050901 -> - 01.Sept.2005 00:00:00, 10:00:00 -> -10h
     * Returned is the new date object
     *
     * @param  string|integer|Zend_Date  $date    ISO Date to sub
     * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
     * @return integer|Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function subIso($date, $locale = null)
    {
        return $this->_calcvalue('sub', $date, 'iso', self::ISO_8601, $locale);
    }


    /**
     * Compares a ISO date with the date object. Not given parts are set to default.
     * Only supported ISO 8601 formats are accepted.
     * For example: 050901 -> - 01.Sept.2005 00:00:00, 10:00:00 -> -10h
     * Returns if equal, earlier or later
     *
     * @param  string|integer|Zend_Date  $date    ISO Date to sub
     * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
     * @return integer  0 = equal, 1 = later, -1 = earlier
     * @throws Zend_Date_Exception
     */
    public function compareIso($date, $locale = null)
    {
        return $this->_calcvalue('cmp', $date, 'iso', self::ISO_8601, $locale);
    }


    /**
     * Returns a RFC 822 compilant datestring from the date object.
     * This function does not return the RFC date as object. Use copy() instead.
     *
     * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
     * @return string
     */
    public function getArpa($locale = null)
    {
        return $this->get(self::RFC_822, $locale);
    }


    /**
     * Sets a RFC 822 date as new date for the date object.
     * Only RFC 822 compilant date strings are accepted.
     * For example: Sat, 14 Feb 09 00:31:30 +0100
     * Returned is the new date object
     *
     * @param  string|integer|Zend_Date  $date    RFC 822 to set
     * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
     * @return integer|Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function setArpa($date, $locale = null)
    {
        return $this->_calcvalue('set', $date, 'arpa', self::RFC_822, $locale);
    }


    /**
     * Adds a RFC 822 date to the date object.
     * ARPA messages are used in emails or HTTP Headers.
     * Only RFC 822 compilant date strings are accepted.
     * For example: Sat, 14 Feb 09 00:31:30 +0100
     * Returned is the new date object
     *
     * @param  string|integer|Zend_Date  $date    RFC 822 Date to add
     * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
     * @return integer|Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function addArpa($date, $locale = null)
    {
        return $this->_calcvalue('add', $date, 'arpa', self::RFC_822, $locale);
    }


    /**
     * Subtracts a RFC 822 date from the date object.
     * ARPA messages are used in emails or HTTP Headers.
     * Only RFC 822 compilant date strings are accepted.
     * For example: Sat, 14 Feb 09 00:31:30 +0100
     * Returned is the new date object
     *
     * @param  string|integer|Zend_Date  $date    RFC 822 Date to sub
     * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
     * @return integer|Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function subArpa($date, $locale = null)
    {
        return $this->_calcvalue('sub', $date, 'arpa', self::RFC_822, $locale);
    }


    /**
     * Compares a RFC 822 compilant date with the date object.
     * ARPA messages are used in emails or HTTP Headers.
     * Only RFC 822 compilant date strings are accepted.
     * For example: Sat, 14 Feb 09 00:31:30 +0100
     * Returns if equal, earlier or later
     *
     * @param  string|integer|Zend_Date  $date    RFC 822 Date to sub
     * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
     * @return integer  0 = equal, 1 = later, -1 = earlier
     * @throws Zend_Date_Exception
     */
    public function compareArpa($date, $locale = null)
    {
        return $this->_calcvalue('cmp', $date, 'arpa', self::RFC_822, $locale);
    }


    /**
     * Check if location is supported
     *
     * @param $location array - locations array
     * @return $horizon float
     */
    private function _checkLocation($location)
    {
        if (!isset($location['longitude']) or !isset($location['latitude'])) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception('Location must include \'longitude\' and \'latitude\'', $location);
        }
        if (($location['longitude'] > 180) or ($location['longitude'] < -180)) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception('Longitude must be between -180 and 180', $location);
        }
        if (($location['latitude'] > 90) or ($location['latitude'] < -90)) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception('Latitude must be between -90 and 90', $location);
        }

        if (!isset($location['horizon'])){
            $location['horizon'] = 'effective';
        }

        switch ($location['horizon']) {
            case 'civil' :
                return -0.104528;
                break;
            case 'nautic' :
                return -0.207912;
                break;
            case 'astronomic' :
                return -0.309017;
                break;
            default :
                return -0.0145439;
                break;
        }
    }


    /**
     * Returns the time of sunrise for this date and a given location as new date object
     * For a list of cities and correct locations use the class Zend_Date_Cities
     *
     * @param  $location array - location of sunrise
     *                   ['horizon']   -> civil, nautic, astronomical, effective (default)
     *                   ['longitude'] -> longitude of location
     *                   ['latitude']  -> latitude of location
     * @return Zend_Date
     * @throws Zend_Date_Exception
     */
    public function getSunrise($location)
    {
        $horizon = $this->_checkLocation($location);
        $result = clone $this;
        $result->set($this->calcSun($location, $horizon, true), self::TIMESTAMP);
        return $result;
    }


    /**
     * Returns the time of sunset for this date and a given location as new date object
     * For a list of cities and correct locations use the class Zend_Date_Cities
     *
     * @param  $location array - location of sunset
     *                   ['horizon']   -> civil, nautic, astronomical, effective (default)
     *                   ['longitude'] -> longitude of location
     *                   ['latitude']  -> latitude of location
     * @return Zend_Date
     * @throws Zend_Date_Exception
     */
    public function getSunset($location)
    {
        $horizon = $this->_checkLocation($location);
        $result = clone $this;
        $result->set($this->calcSun($location, $horizon, false), self::TIMESTAMP);
        return $result;
    }


    /**
     * Returns an array with the sunset and sunrise dates for all horizon types
     * For a list of cities and correct locations use the class Zend_Date_Cities
     *
     * @param  $location array - location of suninfo
     *                   ['horizon']   -> civil, nautic, astronomical, effective (default)
     *                   ['longitude'] -> longitude of location
     *                   ['latitude']  -> latitude of location
     * @return array - [sunset|sunrise][effective|civil|nautic|astronomic]
     * @throws Zend_Date_Exception
     */
    public function getSunInfo($location)
    {
        $suninfo = array();
        for ($i = 0; $i < 4; ++$i) {
            switch ($i) {
                case 0 :
                    $location['horizon'] = 'effective';
                    break;
                case 1 :
                    $location['horizon'] = 'civil';
                    break;
                case 2 :
                    $location['horizon'] = 'nautic';
                    break;
                case 3 :
                    $location['horizon'] = 'astronomic';
                    break;
            }
            $horizon = $this->_checkLocation($location);
            $result = clone $this;
            $result->set($this->calcSun($location, $horizon, true), self::TIMESTAMP);
            $suninfo['sunrise'][$location['horizon']] = $result;
            $result = clone $this;
            $result->set($this->calcSun($location, $horizon, false), self::TIMESTAMP);
            $suninfo['sunset'][$location['horizon']]  = $result;
        }
        return $suninfo;
    }


    /**
     * Check a given year for leap year.
     *
     * @param  integer|array|Zend_Date  $year  Year to check
     * @return boolean
     */
    public static function checkLeapYear($year)
    {
        if ($year instanceof Zend_Date) {
            $year = (int) $year->get(self::YEAR);
        }
        if (is_array($year)) {
            if (isset($year['year']) === true) {
                $year = $year['year'];
            } else {
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("no year given in array");
            }
        }
        if (!is_numeric($year)) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception("year ($year) has to be integer for checkLeapYear()", $year);
        }

        return (bool) parent::isYearLeapYear($year);
    }


    /**
     * Returns true, if the year is a leap year.
     *
     * @return boolean
     */
    public function isLeapYear()
    {
        return self::checkLeapYear($this);
    }


    /**
     * Returns if the set date is todays date
     *
     * @return boolean
     */
    public function isToday()
    {
        $today = $this->date('Ymd', $this->_getTime());
        $day   = $this->date('Ymd', $this->getUnixTimestamp());
        return ($today == $day);
    }


    /**
     * Returns if the set date is yesterdays date
     *
     * @return boolean
     */
    public function isYesterday()
    {
        list($year, $month, $day) = explode('-', $this->date('Y-m-d', $this->_getTime()));
        // adjusts for leap days and DST changes that are timezone specific
        $yesterday = $this->date('Ymd', $this->mktime(0, 0, 0, $month, $day -1, $year));
        $day   = $this->date('Ymd', $this->getUnixTimestamp());
        return $day == $yesterday;
    }


    /**
     * Returns if the set date is tomorrows date
     *
     * @return boolean
     */
    public function isTomorrow()
    {
        list($year, $month, $day) = explode('-', $this->date('Y-m-d', $this->_getTime()));
        // adjusts for leap days and DST changes that are timezone specific
        $tomorrow = $this->date('Ymd', $this->mktime(0, 0, 0, $month, $day +1, $year));
        $day   = $this->date('Ymd', $this->getUnixTimestamp());
        return $day == $tomorrow;
    }

    /**
     * Returns the actual date as new date object
     *
     * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     */
    public static function now($locale = null)
    {
        return new Zend_Date(time(), self::TIMESTAMP, $locale);
    }

    /**
     * Calculate date details
     *
     * @param  string                          $calc    Calculation to make
     * @param  string|integer|array|Zend_Date  $date    Date or Part to calculate
     * @param  string                          $part    Datepart for Calculation
     * @param  string|Zend_Locale              $locale  Locale for parsing input
     * @return integer|string  new date
     * @throws Zend_Date_Exception
     */
    private function _calcdetail($calc, $date, $type, $locale)
    {
        switch($calc) {
            case 'set' :
                return $this->set($date, $type, $locale);
                break;
            case 'add' :
                return $this->add($date, $type, $locale);
                break;
            case 'sub' :
                return $this->sub($date, $type, $locale);
                break;
        }
        return $this->compare($date, $type, $locale);
    }

    /**
     * Internal calculation, returns the requested date type
     *
     * @param  string                    $calc    Calculation to make
     * @param  string|integer|Zend_Date  $value   Datevalue to calculate with, if null the actual value is taken
     * @param  string|Zend_Locale        $locale  Locale for parsing input
     * @return integer|Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    private function _calcvalue($calc, $value, $type, $parameter, $locale)
    {
        if ($value === null) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception("parameter $type must be set, null is not allowed");
        }

        if ($locale === null) {
            $locale = $this->getLocale();
        }

        if ($value instanceof Zend_Date) {
            // extract value from object
            $value = $value->get($parameter, $locale);
        } else if (!is_array($value) && !is_numeric($value) && ($type != 'iso') && ($type != 'arpa')) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception("invalid $type ($value) operand", $value);
        }

        $return = $this->_calcdetail($calc, $value, $parameter, $locale);
        if ($calc != 'cmp') {
            return $this;
        }
        return $return;
    }


    /**
     * Returns only the year from the date object as new object.
     * For example: 10.May.2000 10:30:00 -> 01.Jan.2000 00:00:00
     *
     * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     */
    public function getYear($locale = null)
    {
        return $this->copyPart(self::YEAR, $locale);
    }


    /**
     * Sets a new year
     * If the year is between 0 and 69, 2000 will be set (2000-2069)
     * If the year if between 70 and 99, 1999 will be set (1970-1999)
     * 3 or 4 digit years are set as expected. If you need to set year 0-99
     * use set() instead.
     * Returned is the new date object
     *
     * @param  string|integer|array|Zend_Date  $date    Year to set
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function setYear($year, $locale = null)
    {
        return $this->_calcvalue('set', $year, 'year', self::YEAR, $locale);
    }


    /**
     * Adds the year to the existing date object
     * If the year is between 0 and 69, 2000 will be added (2000-2069)
     * If the year if between 70 and 99, 1999 will be added (1970-1999)
     * 3 or 4 digit years are added as expected. If you need to add years from 0-99
     * use add() instead.
     * Returned is the new date object
     *
     * @param  string|integer|array|Zend_Date  $date    Year to add
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function addYear($year, $locale = null)
    {
        return $this->_calcvalue('add', $year, 'year', self::YEAR, $locale);
    }


    /**
     * Subs the year from the existing date object
     * If the year is between 0 and 69, 2000 will be subtracted (2000-2069)
     * If the year if between 70 and 99, 1999 will be subtracted (1970-1999)
     * 3 or 4 digit years are subtracted as expected. If you need to subtract years from 0-99
     * use sub() instead.
     * Returned is the new date object
     *
     * @param  string|integer|array|Zend_Date  $date    Year to sub
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function subYear($year, $locale = null)
    {
        return $this->_calcvalue('sub', $year, 'year', self::YEAR, $locale);
    }


    /**
     * Compares the year with the existing date object, ignoring other date parts.
     * For example: 10.03.2000 -> 15.02.2000 -> true
     * Returns if equal, earlier or later
     *
     * @param  string|integer|array|Zend_Date  $year    Year to compare
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return integer  0 = equal, 1 = later, -1 = earlier
     * @throws Zend_Date_Exception
     */
    public function compareYear($year, $locale = null)
    {
        return $this->_calcvalue('cmp', $year, 'year', self::YEAR, $locale);
    }


    /**
     * Returns only the month from the date object as new object.
     * For example: 10.May.2000 10:30:00 -> 01.May.1970 00:00:00
     *
     * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     */
    public function getMonth($locale = null)
    {
        return $this->copyPart(self::MONTH, $locale);
    }


    /**
     * Returns the calculated month
     *
     * @param  string                          $calc    Calculation to make
     * @param  string|integer|array|Zend_Date  $month   Month to calculate with, if null the actual month is taken
     * @param  string|Zend_Locale              $locale  Locale for parsing input
     * @return integer|Zend_Date  new time
     * @throws Zend_Date_Exception
     */
    private function _month($calc, $month, $locale)
    {
        if ($month === null) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception('parameter $month must be set, null is not allowed');
        }

        if ($locale === null) {
            $locale = $this->getLocale();
        }

        if ($month instanceof Zend_Date) {
            // extract month from object
            $found = $month->get(self::MONTH_SHORT, $locale);
        } else {
            if (is_numeric($month)) {
                $found = $month;
            } else if (is_array($month)) {
                if (isset($month['month']) === true) {
                    $month = $month['month'];
                } else {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception("no month given in array");
                }
            } else {
                $monthlist  = Zend_Locale_Data::getList($locale, 'month');
                $monthlist2 = Zend_Locale_Data::getList($locale, 'month', array('gregorian', 'format', 'abbreviated'));

                $monthlist = array_merge($monthlist, $monthlist2);
                $found = 0;
                $cnt = 0;
                foreach ($monthlist as $key => $value) {
                    if (strtoupper($value) == strtoupper($month)) {
                        $found = ($key % 12) + 1;
                        break;
                    }
                    ++$cnt;
                }
                if ($found == 0) {
                    foreach ($monthlist2 as $key => $value) {
                        if (strtoupper(iconv_substr($value, 0, 1, 'UTF-8')) == strtoupper($month)) {
                            $found = $key + 1;
                            break;
                        }
                        ++$cnt;
                    }
                }
                if ($found == 0) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception("unknown month name ($month)", $month);
                }
            }
        }
        $return = $this->_calcdetail($calc, $found, self::MONTH_SHORT, $locale);
        if ($calc != 'cmp') {
            return $this;
        }
        return $return;
    }


    /**
     * Sets a new month
     * The month can be a number or a string. Setting months lower then 0 and greater then 12
     * will result in adding or subtracting the relevant year. (12 months equal one year)
     * If a localized monthname is given it will be parsed with the default locale or the optional
     * set locale.
     * Returned is the new date object
     *
     * @param  string|integer|array|Zend_Date  $month   Month to set
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function setMonth($month, $locale = null)
    {
        return $this->_month('set', $month, $locale);
    }


    /**
     * Adds months to the existing date object.
     * The month can be a number or a string. Adding months lower then 0 and greater then 12
     * will result in adding or subtracting the relevant year. (12 months equal one year)
     * If a localized monthname is given it will be parsed with the default locale or the optional
     * set locale.
     * Returned is the new date object
     *
     * @param  string|integer|array|Zend_Date  $month   Month to add
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function addMonth($month, $locale = null)
    {
        return $this->_month('add', $month, $locale);
    }


    /**
     * Subtracts months from the existing date object.
     * The month can be a number or a string. Subtracting months lower then 0 and greater then 12
     * will result in adding or subtracting the relevant year. (12 months equal one year)
     * If a localized monthname is given it will be parsed with the default locale or the optional
     * set locale.
     * Returned is the new date object
     *
     * @param  string|integer|array|Zend_Date  $month   Month to sub
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function subMonth($month, $locale = null)
    {
        return $this->_month('sub', $month, $locale);
    }


    /**
     * Compares the month with the existing date object, ignoring other date parts.
     * For example: 10.03.2000 -> 15.03.1950 -> true
     * Returns if equal, earlier or later
     *
     * @param  string|integer|array|Zend_Date  $month   Month to compare
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return integer  0 = equal, 1 = later, -1 = earlier
     * @throws Zend_Date_Exception
     */
    public function compareMonth($month, $locale = null)
    {
        return $this->_month('cmp', $month, $locale);
    }


    /**
     * Returns the day as new date object
     * Example: 20.May.1986 -> 20.Jan.1970 00:00:00
     *
     * @param $locale  string|Zend_Locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     */
    public function getDay($locale = null)
    {
        return $this->copyPart(self::DAY_SHORT, $locale);
    }


    /**
     * Returns the calculated day
     *
     * @param $calc    string                    Type of calculation to make
     * @param $day     string|integer|Zend_Date  Day to calculate, when null the actual day is calculated
     * @param $locale  string|Zend_Locale        Locale for parsing input
     * @return Zend_Date|integer
     */
    private function _day($calc, $day, $locale)
    {
        if ($day === null) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception('parameter $day must be set, null is not allowed');
        }

        if ($locale === null) {
            $locale = $this->getLocale();
        }

        if ($day instanceof Zend_Date) {
            $day = $day->get(self::DAY_SHORT, $locale);
        }

        if (is_numeric($day)) {
            $type = self::DAY_SHORT;
        } else if (is_array($day)) {
            if (isset($day['day']) === true) {
                $day = $day['day'];
                $type = self::WEEKDAY;
            } else {
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("no day given in array");
            }
        } else {
            switch (iconv_strlen($day, 'UTF-8')) {
                case 1 :
                   $type = self::WEEKDAY_NARROW;
                    break;
                case 2:
                    $type = self::WEEKDAY_NAME;
                    break;
                case 3:
                    $type = self::WEEKDAY_SHORT;
                    break;
                default:
                    $type = self::WEEKDAY;
                    break;
            }
        }
        $return = $this->_calcdetail($calc, $day, $type, $locale);
        if ($calc != 'cmp') {
            return $this;
        }
        return $return;
    }


    /**
     * Sets a new day
     * The day can be a number or a string. Setting days lower then 0 or greater than the number of this months days
     * will result in adding or subtracting the relevant month.
     * If a localized dayname is given it will be parsed with the default locale or the optional
     * set locale.
     * Returned is the new date object
     * Example: setDay('Montag', 'de_AT'); will set the monday of this week as day.
     *
     * @param  string|integer|array|Zend_Date  $month   Day to set
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function setDay($day, $locale = null)
    {
        return $this->_day('set', $day, $locale);
    }


    /**
     * Adds days to the existing date object.
     * The day can be a number or a string. Adding days lower then 0 or greater than the number of this months days
     * will result in adding or subtracting the relevant month.
     * If a localized dayname is given it will be parsed with the default locale or the optional
     * set locale.
     * Returned is the new date object
     * Example: addDay('Montag', 'de_AT'); will add the number of days until the next monday
     *
     * @param  string|integer|array|Zend_Date  $month   Day to add
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function addDay($day, $locale = null)
    {
        return $this->_day('add', $day, $locale);
    }


    /**
     * Subtracts days from the existing date object.
     * The day can be a number or a string. Subtracting days lower then 0 or greater than the number of this months days
     * will result in adding or subtracting the relevant month.
     * If a localized dayname is given it will be parsed with the default locale or the optional
     * set locale.
     * Returned is the new date object
     * Example: subDay('Montag', 'de_AT'); will sub the number of days until the previous monday
     *
     * @param  string|integer|array|Zend_Date  $month   Day to sub
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function subDay($day, $locale = null)
    {
        return $this->_day('sub', $day, $locale);
    }


    /**
     * Compares the day with the existing date object, ignoring other date parts.
     * For example: 'Monday', 'en' -> 08.Jan.2007 -> 0
     * Returns if equal, earlier or later
     *
     * @param  string|integer|array|Zend_Date  $day     Day to compare
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return integer  0 = equal, 1 = later, -1 = earlier
     * @throws Zend_Date_Exception
     */
    public function compareDay($day, $locale = null)
    {
        return $this->_day('cmp', $day, $locale);
    }


    /**
     * Returns the weekday as new date object
     * Weekday is always from 1-7
     * Example: 09-Jan-2007 -> 2 = Tuesday -> 02-Jan-1970 (when 02.01.1970 is also Tuesday)
     *
     * @param $locale  string|Zend_Locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     */
    public function getWeekday($locale = null)
    {
        return $this->copyPart(self::WEEKDAY, $locale);
    }


    /**
     * Returns the calculated weekday
     *
     * @param  $calc     string                          Type of calculation to make
     * @param  $weekday  string|integer|array|Zend_Date  Weekday to calculate, when null the actual weekday is calculated
     * @param  $locale   string|Zend_Locale              Locale for parsing input
     * @return Zend_Date|integer
     * @throws Zend_Date_Exception
     */
    private function _weekday($calc, $weekday, $locale)
    {
        if ($weekday === null) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception('parameter $weekday must be set, null is not allowed');
        }

        if ($locale === null) {
            $locale = $this->getLocale();
        }

        if ($weekday instanceof Zend_Date) {
            $weekday = $weekday->get(self::WEEKDAY_8601, $locale);
        }

        if (is_numeric($weekday)) {
            $type = self::WEEKDAY_8601;
        } else if (is_array($weekday)) {
            if (isset($weekday['weekday']) === true) {
                $weekday = $weekday['weekday'];
                $type = self::WEEKDAY;
            } else {
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("no weekday given in array");
            }
        } else {
            switch(iconv_strlen($weekday, 'UTF-8')) {
                case 1:
                   $type = self::WEEKDAY_NARROW;
                    break;
                case 2:
                    $type = self::WEEKDAY_NAME;
                    break;
                case 3:
                    $type = self::WEEKDAY_SHORT;
                    break;
                default:
                    $type = self::WEEKDAY;
                    break;
            }
        }
        $return = $this->_calcdetail($calc, $weekday, $type, $locale);
        if ($calc != 'cmp') {
            return $this;
        }
        return $return;
    }


    /**
     * Sets a new weekday
     * The weekday can be a number or a string. If a localized weekday name is given,
     * then it will be parsed as a date in $locale (defaults to the same locale as $this).
     * Returned is the new date object.
     * Example: setWeekday(3); will set the wednesday of this week as day.
     *
     * @param  string|integer|array|Zend_Date  $month   Weekday to set
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function setWeekday($weekday, $locale = null)
    {
        return $this->_weekday('set', $weekday, $locale);
    }


    /**
     * Adds weekdays to the existing date object.
     * The weekday can be a number or a string.
     * If a localized dayname is given it will be parsed with the default locale or the optional
     * set locale.
     * Returned is the new date object
     * Example: addWeekday(3); will add the difference of days from the begining of the month until
     * wednesday.
     *
     * @param  string|integer|array|Zend_Date  $month   Weekday to add
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function addWeekday($weekday, $locale = null)
    {
        return $this->_weekday('add', $weekday, $locale);
    }


    /**
     * Subtracts weekdays from the existing date object.
     * The weekday can be a number or a string.
     * If a localized dayname is given it will be parsed with the default locale or the optional
     * set locale.
     * Returned is the new date object
     * Example: subWeekday(3); will subtract the difference of days from the begining of the month until
     * wednesday.
     *
     * @param  string|integer|array|Zend_Date  $month   Weekday to sub
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function subWeekday($weekday, $locale = null)
    {
        return $this->_weekday('sub', $weekday, $locale);
    }


    /**
     * Compares the weekday with the existing date object, ignoring other date parts.
     * For example: 'Monday', 'en' -> 08.Jan.2007 -> 0
     * Returns if equal, earlier or later
     *
     * @param  string|integer|array|Zend_Date  $weekday  Weekday to compare
     * @param  string|Zend_Locale              $locale   OPTIONAL Locale for parsing input
     * @return integer  0 = equal, 1 = later, -1 = earlier
     * @throws Zend_Date_Exception
     */
    public function compareWeekday($weekday, $locale = null)
    {
        return $this->_weekday('cmp', $weekday, $locale);
    }


    /**
     * Returns the day of year as new date object
     * Example: 02.Feb.1986 10:00:00 -> 02.Feb.1970 00:00:00
     *
     * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     */
    public function getDayOfYear($locale = null)
    {
        return $this->copyPart(self::DAY_OF_YEAR, $locale);
    }


    /**
     * Sets a new day of year
     * The day of year is always a number.
     * Returned is the new date object
     * Example: 04.May.2004 -> setDayOfYear(10) -> 10.Jan.2004
     *
     * @param  string|integer|array|Zend_Date  $day     Day of Year to set
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function setDayOfYear($day, $locale = null)
    {
        return $this->_calcvalue('set', $day, 'day of year', self::DAY_OF_YEAR, $locale);
    }


    /**
     * Adds a day of year to the existing date object.
     * The day of year is always a number.
     * Returned is the new date object
     * Example: addDayOfYear(10); will add 10 days to the existing date object.
     *
     * @param  string|integer|array|Zend_Date  $day     Day of Year to add
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function addDayOfYear($day, $locale = null)
    {
        return $this->_calcvalue('add', $day, 'day of year', self::DAY_OF_YEAR, $locale);
    }


    /**
     * Subtracts a day of year from the existing date object.
     * The day of year is always a number.
     * Returned is the new date object
     * Example: subDayOfYear(10); will subtract 10 days from the existing date object.
     *
     * @param  string|integer|array|Zend_Date  $day     Day of Year to sub
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function subDayOfYear($day, $locale = null)
    {
        return $this->_calcvalue('sub', $day, 'day of year', self::DAY_OF_YEAR, $locale);
    }


    /**
     * Compares the day of year with the existing date object.
     * For example: compareDayOfYear(33) -> 02.Feb.2007 -> 0
     * Returns if equal, earlier or later
     *
     * @param  string|integer|array|Zend_Date  $day     Day of Year to compare
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return integer  0 = equal, 1 = later, -1 = earlier
     * @throws Zend_Date_Exception
     */
    public function compareDayOfYear($day, $locale = null)
    {
        return $this->_calcvalue('cmp', $day, 'day of year', self::DAY_OF_YEAR, $locale);
    }


    /**
     * Returns the hour as new date object
     * Example: 02.Feb.1986 10:30:25 -> 01.Jan.1970 10:00:00
     *
     * @param $locale  string|Zend_Locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     */
    public function getHour($locale = null)
    {
        return $this->copyPart(self::HOUR, $locale);
    }


    /**
     * Sets a new hour
     * The hour is always a number.
     * Returned is the new date object
     * Example: 04.May.1993 13:07:25 -> setHour(7); -> 04.May.1993 07:07:25
     *
     * @param  string|integer|array|Zend_Date  $hour    Hour to set
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function setHour($hour, $locale = null)
    {
        return $this->_calcvalue('set', $hour, 'hour', self::HOUR_SHORT, $locale);
    }


    /**
     * Adds hours to the existing date object.
     * The hour is always a number.
     * Returned is the new date object
     * Example: 04.May.1993 13:07:25 -> addHour(12); -> 05.May.1993 01:07:25
     *
     * @param  string|integer|array|Zend_Date  $hour    Hour to add
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function addHour($hour, $locale = null)
    {
        return $this->_calcvalue('add', $hour, 'hour', self::HOUR_SHORT, $locale);
    }


    /**
     * Subtracts hours from the existing date object.
     * The hour is always a number.
     * Returned is the new date object
     * Example: 04.May.1993 13:07:25 -> subHour(6); -> 05.May.1993 07:07:25
     *
     * @param  string|integer|array|Zend_Date  $hour    Hour to sub
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function subHour($hour, $locale = null)
    {
        return $this->_calcvalue('sub', $hour, 'hour', self::HOUR_SHORT, $locale);
    }


    /**
     * Compares the hour with the existing date object.
     * For example: 10:30:25 -> compareHour(10) -> 0
     * Returns if equal, earlier or later
     *
     * @param  string|integer|array|Zend_Date  $hour    Hour to compare
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return integer  0 = equal, 1 = later, -1 = earlier
     * @throws Zend_Date_Exception
     */
    public function compareHour($hour, $locale = null)
    {
        return $this->_calcvalue('cmp', $hour, 'hour', self::HOUR_SHORT, $locale);
    }


    /**
     * Returns the minute as new date object
     * Example: 02.Feb.1986 10:30:25 -> 01.Jan.1970 00:30:00
     *
     * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     */
    public function getMinute($locale = null)
    {
        return $this->copyPart(self::MINUTE, $locale);
    }


    /**
     * Sets a new minute
     * The minute is always a number.
     * Returned is the new date object
     * Example: 04.May.1993 13:07:25 -> setMinute(29); -> 04.May.1993 13:29:25
     *
     * @param  string|integer|array|Zend_Date  $minute  Minute to set
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function setMinute($minute, $locale = null)
    {
        return $this->_calcvalue('set', $minute, 'minute', self::MINUTE_SHORT, $locale);
    }


    /**
     * Adds minutes to the existing date object.
     * The minute is always a number.
     * Returned is the new date object
     * Example: 04.May.1993 13:07:25 -> addMinute(65); -> 04.May.1993 13:12:25
     *
     * @param  string|integer|array|Zend_Date  $minute  Minute to add
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function addMinute($minute, $locale = null)
    {
        return $this->_calcvalue('add', $minute, 'minute', self::MINUTE_SHORT, $locale);
    }


    /**
     * Subtracts minutes from the existing date object.
     * The minute is always a number.
     * Returned is the new date object
     * Example: 04.May.1993 13:07:25 -> subMinute(9); -> 04.May.1993 12:58:25
     *
     * @param  string|integer|array|Zend_Date  $minute  Minute to sub
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function subMinute($minute, $locale = null)
    {
        return $this->_calcvalue('sub', $minute, 'minute', self::MINUTE_SHORT, $locale);
    }


    /**
     * Compares the minute with the existing date object.
     * For example: 10:30:25 -> compareMinute(30) -> 0
     * Returns if equal, earlier or later
     *
     * @param  string|integer|array|Zend_Date  $minute  Hour to compare
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return integer  0 = equal, 1 = later, -1 = earlier
     * @throws Zend_Date_Exception
     */
    public function compareMinute($minute, $locale = null)
    {
        return $this->_calcvalue('cmp', $minute, 'minute', self::MINUTE_SHORT, $locale);
    }


    /**
     * Returns the second as new date object
     * Example: 02.Feb.1986 10:30:25 -> 01.Jan.1970 00:00:25
     *
     * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     */
    public function getSecond($locale = null)
    {
        return $this->copyPart(self::SECOND, $locale);
    }


    /**
     * Sets new seconds to the existing date object.
     * The second is always a number.
     * Returned is the new date object
     * Example: 04.May.1993 13:07:25 -> setSecond(100); -> 04.May.1993 13:08:40
     *
     * @param  string|integer|array|Zend_Date $second Second to set
     * @param  string|Zend_Locale             $locale (Optional) Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function setSecond($second, $locale = null)
    {
        return $this->_calcvalue('set', $second, 'second', self::SECOND_SHORT, $locale);
    }


    /**
     * Adds seconds to the existing date object.
     * The second is always a number.
     * Returned is the new date object
     * Example: 04.May.1993 13:07:25 -> addSecond(65); -> 04.May.1993 13:08:30
     *
     * @param  string|integer|array|Zend_Date $second Second to add
     * @param  string|Zend_Locale             $locale (Optional) Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function addSecond($second, $locale = null)
    {
        return $this->_calcvalue('add', $second, 'second', self::SECOND_SHORT, $locale);
    }


    /**
     * Subtracts seconds from the existing date object.
     * The second is always a number.
     * Returned is the new date object
     * Example: 04.May.1993 13:07:25 -> subSecond(10); -> 04.May.1993 13:07:15
     *
     * @param  string|integer|array|Zend_Date $second Second to sub
     * @param  string|Zend_Locale             $locale (Optional) Locale for parsing input
     * @return Zend_Date  new date
     * @throws Zend_Date_Exception
     */
    public function subSecond($second, $locale = null)
    {
        return $this->_calcvalue('sub', $second, 'second', self::SECOND_SHORT, $locale);
    }


    /**
     * Compares the second with the existing date object.
     * For example: 10:30:25 -> compareSecond(25) -> 0
     * Returns if equal, earlier or later
     *
     * @param  string|integer|array|Zend_Date $second Second to compare
     * @param  string|Zend_Locale             $locale (Optional) Locale for parsing input
     * @return integer  0 = equal, 1 = later, -1 = earlier
     * @throws Zend_Date_Exception
     */
    public function compareSecond($second, $locale = null)
    {
        return $this->_calcvalue('cmp', $second, 'second', self::SECOND_SHORT, $locale);
    }


    /**
     * Returns the precision for fractional seconds
     *
     * @return integer
     */
    public function getFractionalPrecision()
    {
        return $this->_precision;
    }


    /**
     * Sets a new precision for fractional seconds
     *
     * @param  integer $precision Precision for the fractional datepart 3 = milliseconds
     * @throws Zend_Date_Exception
     * @return void
     */
    public function setFractionalPrecision($precision)
    {
        if (!intval($precision) or ($precision < 0) or ($precision > 9)) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception("precision ($precision) must be a positive integer less than 10", $precision);
        }
        $this->_precision = (int) $precision;
    }


    /**
     * Returns the milliseconds of the date object
     *
     * @return integer
     */
    public function getMilliSecond()
    {
        return $this->_fractional;
    }


    /**
     * Sets new milliseconds for the date object
     * Example: setMilliSecond(550, 2) -> equals +5 Sec +50 MilliSec
     *
     * @param  integer|Zend_Date $milli     (Optional) Millisecond to set, when null the actual millisecond is set
     * @param  integer           $precision (Optional) Fraction precision of the given milliseconds
     * @return integer|string
     */
    public function setMilliSecond($milli = null, $precision = null)
    {
        if ($milli === null) {
            list($milli, $time) = explode(" ", microtime());
            $milli = intval($milli);
            $precision = 6;
        } else if (!is_numeric($milli)) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception("invalid milli second ($milli) operand", $milli);
        }

        if ($precision === null) {
            $precision = $this->_precision;
        } else if (!is_int($precision) || $precision < 1 || $precision > 9) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception("precision ($precision) must be a positive integer less than 10", $precision);
        }

        $this->_fractional = 0;
        $this->addMilliSecond($milli, $precision);
        return $this->_fractional;
    }


    /**
     * Adds milliseconds to the date object
     *
     * @param  integer|Zend_Date $milli     (Optional) Millisecond to add, when null the actual millisecond is added
     * @param  integer           $precision (Optional) Fractional precision for the given milliseconds
     * @return integer|string
     */
    public function addMilliSecond($milli = null, $precision = null)
    {
        if ($milli === null) {
            list($milli, $time) = explode(" ", microtime());
            $milli = intval($milli);
        } else if (!is_numeric($milli)) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception("invalid milli second ($milli) operand", $milli);
        }

        if ($precision === null) {
            $precision = $this->_precision;
        } else if (!is_int($precision) || $precision < 1 || $precision > 9) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception("precision ($precision) must be a positive integer less than 10", $precision);
        }

        if ($precision != $this->_precision) {
            if ($precision > $this->_precision) {
                $diff = $precision - $this->_precision;
                $milli = (int) ($milli / (10 * $diff));
            } else {
                $diff = $this->_precision - $precision;
                $milli = (int) ($milli * (10 * $diff));
            }
        }

        $this->_fractional += $milli;
        // Add/sub milliseconds + add/sub seconds

        $max = pow(10, $this->_precision);
        // Milli includes seconds
        if ($this->_fractional >= $max) {
            while ($this->_fractional >= $max) {
                $this->addSecond(1);
                $this->_fractional -= $max;
            }
        }

        if ($this->_fractional < 0) {
            while ($this->_fractional < 0) {
                $this->subSecond(1);
                $this->_fractional += $max;
            }
        }

        return $this->_fractional;
    }


    /**
     * Subtracts a millisecond
     *
     * @param  integer|Zend_Date $milli     (Optional) Millisecond to sub, when null the actual millisecond is subtracted
     * @param  integer           $precision (Optional) Fractional precision for the given milliseconds
     * @return integer
     */
    public function subMilliSecond($milli = null, $precision = null)
    {
        return $this->addMilliSecond(0 - $milli, $precision);
    }

    /**
     * Compares only the millisecond part, returning the difference
     *
     * @param  integer|Zend_Date  $milli  OPTIONAL Millisecond to compare, when null the actual millisecond is compared
     * @param  integer            $precision  OPTIONAL Fractional precision for the given milliseconds
     * @return integer
     */
    public function compareMilliSecond($milli = null, $precision = null)
    {
        if ($milli === null) {
            list($milli, $time) = explode(" ", microtime());
            $milli = intval($milli);
        } else if (is_numeric($milli) === false) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception("invalid milli second ($milli) operand", $milli);
        }

        if ($precision === null) {
            $precision = $this->_precision;
        } else if (!is_int($precision) || $precision < 1 || $precision > 9) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception("precision ($precision) must be a positive integer less than 10", $precision);
        }

        if ($precision === 0) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception('precision is 0');
        }

        if ($precision != $this->_precision) {
            if ($precision > $this->_precision) {
                $diff = $precision - $this->_precision;
                $milli = (int) ($milli / (10 * $diff));
            } else {
                $diff = $this->_precision - $precision;
                $milli = (int) ($milli * (10 * $diff));
            }
        }

        $comp = $this->_fractional - $milli;
        if ($comp < 0) {
            return -1;
        } else if ($comp > 0) {
            return 1;
        }
        return 0;
    }

    /**
     * Returns the week as new date object using monday as begining of the week
     * Example: 12.Jan.2007 -> 08.Jan.1970 00:00:00
     *
     * @param $locale  string|Zend_Locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     */
    public function getWeek($locale = null)
    {
        return $this->copyPart(self::WEEK, $locale);
    }

    /**
     * Sets a new week. The week is always a number. The day of week is not changed.
     * Returned is the new date object
     * Example: 09.Jan.2007 13:07:25 -> setWeek(1); -> 02.Jan.2007 13:07:25
     *
     * @param  string|integer|array|Zend_Date  $week    Week to set
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     * @throws Zend_Date_Exception
     */
    public function setWeek($week, $locale = null)
    {
        return $this->_calcvalue('set', $week, 'week', self::WEEK, $locale);
    }

    /**
     * Adds a week. The week is always a number. The day of week is not changed.
     * Returned is the new date object
     * Example: 09.Jan.2007 13:07:25 -> addWeek(1); -> 16.Jan.2007 13:07:25
     *
     * @param  string|integer|array|Zend_Date  $week    Week to add
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     * @throws Zend_Date_Exception
     */
    public function addWeek($week, $locale = null)
    {
        return $this->_calcvalue('add', $week, 'week', self::WEEK, $locale);
    }

    /**
     * Subtracts a week. The week is always a number. The day of week is not changed.
     * Returned is the new date object
     * Example: 09.Jan.2007 13:07:25 -> subWeek(1); -> 02.Jan.2007 13:07:25
     *
     * @param  string|integer|array|Zend_Date  $week    Week to sub
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return Zend_Date
     * @throws Zend_Date_Exception
     */
    public function subWeek($week, $locale = null)
    {
        return $this->_calcvalue('sub', $week, 'week', self::WEEK, $locale);
    }

    /**
     * Compares only the week part, returning the difference
     * Returned is the new date object
     * Returns if equal, earlier or later
     * Example: 09.Jan.2007 13:07:25 -> compareWeek(2); -> 0
     *
     * @param  string|integer|array|Zend_Date  $week    Week to compare
     * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
     * @return integer 0 = equal, 1 = later, -1 = earlier
     */
    public function compareWeek($week, $locale = null)
    {
        return $this->_calcvalue('cmp', $week, 'week', self::WEEK, $locale);
    }

    /**
     * Sets a new standard locale for the date object.
     * This locale will be used for all functions
     * Returned is the really set locale.
     * Example: 'de_XX' will be set to 'de' because 'de_XX' does not exist
     * 'xx_YY' will be set to 'root' because 'xx' does not exist
     *
     * @param  string|Zend_Locale $locale (Optional) Locale for parsing input
     * @throws Zend_Date_Exception When the given locale does not exist
     * @return Zend_Date Provides fluent interface
     */
    public function setLocale($locale = null)
    {
        try {
            $this->_locale = Zend_Locale::findLocale($locale);
        } catch (Zend_Locale_Exception $e) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception($e->getMessage());
        }

        return $this;
    }

    /**
     * Returns the actual set locale
     *
     * @return string
     */
    public function getLocale()
    {
        return $this->_locale;
    }

    /**
     * Checks if the given date is a real date or datepart.
     * Returns false if a expected datepart is missing or a datepart exceeds its possible border.
     * But the check will only be done for the expected dateparts which are given by format.
     * If no format is given the standard dateformat for the actual locale is used.
     * f.e. 30.February.2007 will return false if format is 'dd.MMMM.YYYY'
     *
     * @param  string|array|Zend_Date $date   Date to parse for correctness
     * @param  string                 $format (Optional) Format for parsing the date string
     * @param  string|Zend_Locale     $locale (Optional) Locale for parsing date parts
     * @return boolean                True when all date parts are correct
     */
    public static function isDate($date, $format = null, $locale = null)
    {
        if (!is_string($date) && !is_numeric($date) && !($date instanceof Zend_Date) &&
            !is_array($date)) {
            return false;
        }

        if (($format !== null) and (Zend_Locale::isLocale($format, null, false))) {
            $locale = $format;
            $format = null;
        }

        $locale = Zend_Locale::findLocale($locale);

        if ($format === null) {
            $format = Zend_Locale_Format::getDateFormat($locale);
        } else if (self::$_options['format_type'] == 'php') {
            $format = Zend_Locale_Format::convertPhpToIsoFormat($format);
        }

        $format = self::_getLocalizedToken($format, $locale);
        if (!is_array($date)) {
            try {
                $parsed = Zend_Locale_Format::getDate($date, array('locale' => $locale,
                                                      'date_format' => $format, 'format_type' => 'iso',
                                                      'fix_date' => false));
            } catch (Zend_Locale_Exception $e) {
                // Date can not be parsed
                return false;
            }
        } else {
            $parsed = $date;
        }

        if (((strpos($format, 'Y') !== false) or (strpos($format, 'y') !== false)) and
            (!isset($parsed['year']))) {
            // Year expected but not found
                return false;
        }

        if ((strpos($format, 'M') !== false) and (!isset($parsed['month']))) {
            // Month expected but not found
            return false;
        }

        if ((strpos($format, 'd') !== false) and (!isset($parsed['day']))) {
            // Day expected but not found
            return false;
        }

        if (((strpos($format, 'H') !== false) or (strpos($format, 'h') !== false)) and
            (!isset($parsed['hour']))) {
            // Hour expected but not found
                return false;
        }

        if ((strpos($format, 'm') !== false) and (!isset($parsed['minute']))) {
            // Minute expected but not found
            return false;
        }

        if ((strpos($format, 's') !== false) and (!isset($parsed['second']))) {
            // Second expected  but not found
            return false;
        }

        // Set not given dateparts
        if (isset($parsed['hour']) === false) {
            $parsed['hour'] = 12;
        }

        if (isset($parsed['minute']) === false) {
            $parsed['minute'] = 0;
        }

        if (isset($parsed['second']) === false) {
            $parsed['second'] = 0;
        }

        if (isset($parsed['month']) === false) {
            $parsed['month'] = 1;
        }

        if (isset($parsed['day']) === false) {
            $parsed['day'] = 1;
        }

        if (isset($parsed['year']) === false) {
            $parsed['year'] = 1970;
        }

        if (self::isYearLeapYear($parsed['year'])) {
            $parsed['year'] = 1972;
        } else {
            $parsed['year'] = 1971;
        }

        $date      = new self($parsed, null, $locale);
        $timestamp = $date->mktime($parsed['hour'], $parsed['minute'], $parsed['second'],
                                   $parsed['month'], $parsed['day'], $parsed['year']);

        if ($parsed['year'] != $date->date('Y', $timestamp)) {
            // Given year differs from parsed year
            return false;
        }

        if ($parsed['month'] != $date->date('n', $timestamp)) {
            // Given month differs from parsed month
            return false;
        }

        if ($parsed['day'] != $date->date('j', $timestamp)) {
            // Given day differs from parsed day
            return false;
        }

        if ($parsed['hour'] != $date->date('G', $timestamp)) {
            // Given hour differs from parsed hour
            return false;
        }

        if ($parsed['minute'] != $date->date('i', $timestamp)) {
            // Given minute differs from parsed minute
            return false;
        }

        if ($parsed['second'] != $date->date('s', $timestamp)) {
            // Given second differs from parsed second
            return false;
        }

        return true;
    }

    /**
     * Returns the ISO Token for all localized constants
     *
     * @param string $token Token to normalize
     * @param string $locale Locale to search
     * @return string
     */
    protected static function _getLocalizedToken($token, $locale)
    {
        switch($token) {
            case self::ISO_8601 :
                return "dd mm yy";
                break;
            case self::RFC_2822 :
                return "EEE, dd MMM yyyy HH:mm:ss";
                break;
            case self::DATES :
                return Zend_Locale_Data::getContent($locale, 'date');
                break;
            case self::DATE_FULL :
                return Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'full'));
                break;
            case self::DATE_LONG :
                return Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'long'));
                break;
            case self::DATE_MEDIUM :
                return Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'medium'));
                break;
            case self::DATE_SHORT :
                return Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'short'));
                break;
            case self::TIMES :
                return Zend_Locale_Data::getContent($locale, 'date');
                break;
            case self::TIME_FULL :
                return Zend_Locale_Data::getContent($locale, 'time', array('gregorian', 'full'));
                break;
            case self::TIME_LONG :
                return Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'long'));
                break;
            case self::TIME_MEDIUM :
                return Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'medium'));
                break;
            case self::TIME_SHORT :
                return Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'short'));
                break;
            case self::DATETIME :
                return Zend_Locale_Data::getContent($locale, 'datetime');
                break;
            case self::DATETIME_FULL :
                return Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'full'));
                break;
            case self::DATETIME_LONG :
                return Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'long'));
                break;
            case self::DATETIME_MEDIUM :
                return Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'medium'));
                break;
            case self::DATETIME_SHORT :
                return Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'short'));
                break;
            case self::ATOM :
            case self::RFC_3339 :
            case self::W3C :
                return "yyyy-MM-DD HH:mm:ss";
                break;
            case self::COOKIE :
            case self::RFC_850 :
                return "EEEE, dd-MM-yyyy HH:mm:ss";
                break;
            case self::RFC_822 :
            case self::RFC_1036 :
            case self::RFC_1123 :
            case self::RSS :
                return "EEE, dd MM yyyy HH:mm:ss";
                break;
        }

        return $token;
    }
}
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        <span class="text truncate grey" id="last-commit-message">switch gis to tencent</span>
        <span class="ui right text grey age"><span class="time-since" title="Thu, 07 May 2020 16:22:27 CST">6 years ago</span></span>
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        <td class="text grey right age"><span class="time-since" title="Wed, 25 Apr 2018 21:20:05 CST">8 years ago</span></td>
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          <a rel="nofollow" class="ui green sha label" href="/Kodo/kodo/commit/2e20a894a3e3de52126faca8f5367147d0c3d6df ">2e20a894a3 </a>
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          <span class="text truncate">pre_adaptive_cameras</span>
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        <td class="text grey right age"><span class="time-since" title="Sat, 22 Feb 2020 16:17:28 CST">6 years ago</span></td>
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        <td class="text grey right age"><span class="time-since" title="Wed, 25 Apr 2018 21:20:05 CST">8 years ago</span></td>
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        <td class="text grey right age"><span class="time-since" title="Wed, 25 Apr 2018 21:20:05 CST">8 years ago</span></td>
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        <td class="text grey right age"><span class="time-since" title="Wed, 25 Apr 2018 21:20:05 CST">8 years ago</span></td>
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          <span class="text truncate">:art: Support del_clerk_sale_submit_api</span>
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          <span class="text truncate">switch gis to tencent</span>
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