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Zend_Date::_calculate ( calc,
date,
part,
locale 
) [private]

Calculates the date or object

Parameters:
string$calcCalculation to make, one of: 'add'|'sub'|'cmp'|'copy'|'set'
string | integer | array | Zend_Date$dateDate or datepart to calculate with
string$partPart of the date to calculate, if null the timestamp is used
string | Zend_Locale$localeLocale for parsing input
Returns:
integer|string|Zend_Date new timestamp
Exceptions:
Zend_Date_Exception

Definition at line 1285 of file Date.php.

References _assign(), _getDigitFromName(), Zend_Locale_Data::getContent(), getDate(), Zend_Locale_Format::getDateFormat(), Zend_Date_DateObject::getDateParts(), Zend_Locale_Format::getDateTime(), getFullYear(), Zend_Locale_Data::getList(), getLocale(), getTime(), Zend_Locale_Format::getTimeFormat(), Zend_Date_DateObject::getUnixTimestamp(), Zend_Locale::isLocale(), Zend_Date_DateObject::mktime(), and toString().

Referenced by add(), compare(), set(), and sub().

    {
        if ($date === null) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception('parameter $date must be set, null is not allowed');
        }

        if (($part !== null) && (strlen($part) !== 2) && (Zend_Locale::isLocale($part, null, false))) {
            $locale = $part;
            $part   = null;
        }

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

        $locale = (string) $locale;

        // Create date parts
        $year   = $this->toString(self::YEAR, 'iso');
        $month  = $this->toString(self::MONTH_SHORT, 'iso');
        $day    = $this->toString(self::DAY_SHORT, 'iso');
        $hour   = $this->toString(self::HOUR_SHORT, 'iso');
        $minute = $this->toString(self::MINUTE_SHORT, 'iso');
        $second = $this->toString(self::SECOND_SHORT, 'iso');
        // If object extract value
        if ($date instanceof Zend_Date) {
            $date = $date->toString($part, 'iso', $locale);
        }

        if (is_array($date) === true) {
            if (empty($part) === false) {
                switch($part) {
                    // Fall through
                    case self::DAY:
                    case self::DAY_SHORT:
                        if (isset($date['day']) === true) {
                            $date = $date['day'];
                        }
                        break;
                    // Fall through
                    case self::WEEKDAY_SHORT:
                    case self::WEEKDAY:
                    case self::WEEKDAY_8601:
                    case self::WEEKDAY_DIGIT:
                    case self::WEEKDAY_NARROW:
                    case self::WEEKDAY_NAME:
                        if (isset($date['weekday']) === true) {
                            $date = $date['weekday'];
                            $part = self::WEEKDAY_DIGIT;
                        }
                        break;
                    case self::DAY_OF_YEAR:
                        if (isset($date['day_of_year']) === true) {
                            $date = $date['day_of_year'];
                        }
                        break;
                    // Fall through
                    case self::MONTH:
                    case self::MONTH_SHORT:
                    case self::MONTH_NAME:
                    case self::MONTH_NAME_SHORT:
                    case self::MONTH_NAME_NARROW:
                        if (isset($date['month']) === true) {
                            $date = $date['month'];
                        }
                        break;
                    // Fall through
                    case self::YEAR:
                    case self::YEAR_SHORT:
                    case self::YEAR_8601:
                    case self::YEAR_SHORT_8601:
                        if (isset($date['year']) === true) {
                            $date = $date['year'];
                        }
                        break;
                    // Fall through
                    case self::HOUR:
                    case self::HOUR_AM:
                    case self::HOUR_SHORT:
                    case self::HOUR_SHORT_AM:
                        if (isset($date['hour']) === true) {
                            $date = $date['hour'];
                        }
                        break;
                    // Fall through
                    case self::MINUTE:
                    case self::MINUTE_SHORT:
                        if (isset($date['minute']) === true) {
                            $date = $date['minute'];
                        }
                        break;
                    // Fall through
                    case self::SECOND:
                    case self::SECOND_SHORT:
                        if (isset($date['second']) === true) {
                            $date = $date['second'];
                        }
                        break;
                    // Fall through
                    case self::TIMEZONE:
                    case self::TIMEZONE_NAME:
                        if (isset($date['timezone']) === true) {
                            $date = $date['timezone'];
                        }
                        break;
                    case self::TIMESTAMP:
                        if (isset($date['timestamp']) === true) {
                            $date = $date['timestamp'];
                        }
                        break;
                    case self::WEEK:
                        if (isset($date['week']) === true) {
                            $date = $date['week'];
                        }
                        break;
                    case self::TIMEZONE_SECS:
                        if (isset($date['gmtsecs']) === true) {
                            $date = $date['gmtsecs'];
                        }
                        break;
                    default:
                        require_once 'Zend/Date/Exception.php';
                        throw new Zend_Date_Exception("datepart for part ($part) not found in array");
                        break;
                }
            } else {
                $hours = 0;
                if (isset($date['hour']) === true) {
                    $hours = $date['hour'];
                }
                $minutes = 0;
                if (isset($date['minute']) === true) {
                    $minutes = $date['minute'];
                }
                $seconds = 0;
                if (isset($date['second']) === true) {
                    $seconds = $date['second'];
                }
                $months = 0;
                if (isset($date['month']) === true) {
                    $months = $date['month'];
                }
                $days = 0;
                if (isset($date['day']) === true) {
                    $days = $date['day'];
                }
                $years = 0;
                if (isset($date['year']) === true) {
                    $years = $date['year'];
                }
                return $this->_assign($calc, $this->mktime($hours, $minutes, $seconds, $months, $days, $years, true),
                                             $this->mktime($hour, $minute, $second, $month, $day, $year, true), $hour);
            }
        }

        // $date as object, part of foreign date as own date
        switch($part) {

            // day formats
            case self::DAY:
                if (is_numeric($date)) {
                    return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + intval($date), 1970, true),
                                                 $this->mktime(0, 0, 0, 1, 1 + intval($day), 1970, true), $hour);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, day expected", 0, null, $date);
                break;

            case self::WEEKDAY_SHORT:
                $daylist = Zend_Locale_Data::getList($locale, 'day');
                $weekday = (int) $this->toString(self::WEEKDAY_DIGIT, 'iso', $locale);
                $cnt = 0;

                foreach ($daylist as $key => $value) {
                    if (strtoupper(iconv_substr($value, 0, 3, 'UTF-8')) == strtoupper($date)) {
                         $found = $cnt;
                        break;
                    }
                    ++$cnt;
                }

                // Weekday found
                if ($cnt < 7) {
                    return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + $found, 1970, true),
                                                 $this->mktime(0, 0, 0, 1, 1 + $weekday, 1970, true), $hour);
                }

                // Weekday not found
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, weekday expected", 0, null, $date);
                break;

            case self::DAY_SHORT:
                if (is_numeric($date)) {
                    return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + intval($date), 1970, true),
                                                 $this->mktime(0, 0, 0, 1, 1 + intval($day), 1970, true), $hour);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, day expected", 0, null, $date);
                break;

            case self::WEEKDAY:
                $daylist = Zend_Locale_Data::getList($locale, 'day');
                $weekday = (int) $this->toString(self::WEEKDAY_DIGIT, 'iso', $locale);
                $cnt = 0;

                foreach ($daylist as $key => $value) {
                    if (strtoupper($value) == strtoupper($date)) {
                        $found = $cnt;
                        break;
                    }
                    ++$cnt;
                }

                // Weekday found
                if ($cnt < 7) {
                    return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + $found, 1970, true),
                                                 $this->mktime(0, 0, 0, 1, 1 + $weekday, 1970, true), $hour);
                }

                // Weekday not found
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, weekday expected", 0, null, $date);
                break;

            case self::WEEKDAY_8601:
                $weekday = (int) $this->toString(self::WEEKDAY_8601, 'iso', $locale);
                if ((intval($date) > 0) and (intval($date) < 8)) {
                    return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + intval($date), 1970, true),
                                                 $this->mktime(0, 0, 0, 1, 1 + $weekday, 1970, true), $hour);
                }

                // Weekday not found
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, weekday expected", 0, null, $date);
                break;

            case self::DAY_SUFFIX:
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception('day suffix not supported', 0, null, $date);
                break;

            case self::WEEKDAY_DIGIT:
                $weekday = (int) $this->toString(self::WEEKDAY_DIGIT, 'iso', $locale);
                if (is_numeric($date) and (intval($date) >= 0) and (intval($date) < 7)) {
                    return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + $date, 1970, true),
                                                 $this->mktime(0, 0, 0, 1, 1 + $weekday, 1970, true), $hour);
                }

                // Weekday not found
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, weekday expected", 0, null, $date);
                break;

            case self::DAY_OF_YEAR:
                if (is_numeric($date)) {
                    if (($calc == 'add') || ($calc == 'sub')) {
                        $year = 1970;
                        ++$date;
                        ++$day;
                    }

                    return $this->_assign($calc, $this->mktime(0, 0, 0, 1, $date, $year, true),
                                                 $this->mktime(0, 0, 0, $month, $day, $year, true), $hour);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, day expected", 0, null, $date);
                break;

            case self::WEEKDAY_NARROW:
                $daylist = Zend_Locale_Data::getList($locale, 'day', array('gregorian', 'format', 'abbreviated'));
                $weekday = (int) $this->toString(self::WEEKDAY_DIGIT, 'iso', $locale);
                $cnt = 0;
                foreach ($daylist as $key => $value) {
                    if (strtoupper(iconv_substr($value, 0, 1, 'UTF-8')) == strtoupper($date)) {
                        $found = $cnt;
                        break;
                    }
                    ++$cnt;
                }

                // Weekday found
                if ($cnt < 7) {
                    return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + $found, 1970, true),
                                                 $this->mktime(0, 0, 0, 1, 1 + $weekday, 1970, true), $hour);
                }

                // Weekday not found
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, weekday expected", 0, null, $date);
                break;

            case self::WEEKDAY_NAME:
                $daylist = Zend_Locale_Data::getList($locale, 'day', array('gregorian', 'format', 'abbreviated'));
                $weekday = (int) $this->toString(self::WEEKDAY_DIGIT, 'iso', $locale);
                $cnt = 0;
                foreach ($daylist as $key => $value) {
                    if (strtoupper($value) == strtoupper($date)) {
                        $found = $cnt;
                        break;
                    }
                    ++$cnt;
                }

                // Weekday found
                if ($cnt < 7) {
                    return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + $found, 1970, true),
                                                 $this->mktime(0, 0, 0, 1, 1 + $weekday, 1970, true), $hour);
                }

                // Weekday not found
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, weekday expected", 0, null, $date);
                break;

            // week formats
            case self::WEEK:
                if (is_numeric($date)) {
                    $week = (int) $this->toString(self::WEEK, 'iso', $locale);
                    return $this->_assign($calc, parent::mktime(0, 0, 0, 1, 1 + ($date * 7), 1970, true),
                                                 parent::mktime(0, 0, 0, 1, 1 + ($week * 7), 1970, true), $hour);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, week expected", 0, null, $date);
                break;

            // month formats
            case self::MONTH_NAME:
                $monthlist = Zend_Locale_Data::getList($locale, 'month');
                $cnt = 0;
                foreach ($monthlist as $key => $value) {
                    if (strtoupper($value) == strtoupper($date)) {
                        $found = $key;
                        break;
                    }
                    ++$cnt;
                }
                $date = array_search($date, $monthlist);

                // Monthname found
                if ($cnt < 12) {
                    $fixday = 0;
                    if ($calc == 'add') {
                        $date += $found;
                        $calc = 'set';
                        if (self::$_options['extend_month'] == false) {
                            $parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
                            if ($parts['mday'] != $day) {
                                $fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
                            }
                        }
                    } else if ($calc == 'sub') {
                        $date = $month - $found;
                        $calc = 'set';
                        if (self::$_options['extend_month'] == false) {
                            $parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
                            if ($parts['mday'] != $day) {
                                $fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
                            }
                        }
                    }
                    return $this->_assign($calc, $this->mktime(0, 0, 0, $date,  $day + $fixday, $year, true),
                                                 $this->mktime(0, 0, 0, $month, $day, $year, true), $hour);
                }

                // Monthname not found
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, month expected", 0, null, $date);
                break;

            case self::MONTH:
                if (is_numeric($date)) {
                    $fixday = 0;
                    if ($calc == 'add') {
                        $date += $month;
                        $calc = 'set';
                        if (self::$_options['extend_month'] == false) {
                            $parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
                            if ($parts['mday'] != $day) {
                                $fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
                            }
                        }
                    } else if ($calc == 'sub') {
                        $date = $month - $date;
                        $calc = 'set';
                        if (self::$_options['extend_month'] == false) {
                            $parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
                            if ($parts['mday'] != $day) {
                                $fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
                            }
                        }
                    }
                    return $this->_assign($calc, $this->mktime(0, 0, 0, $date, $day + $fixday, $year, true),
                                                 $this->mktime(0, 0, 0, $month, $day, $year, true), $hour);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, month expected", 0, null, $date);
                break;

            case self::MONTH_NAME_SHORT:
                $monthlist = Zend_Locale_Data::getList($locale, 'month', array('gregorian', 'format', 'abbreviated'));
                $cnt = 0;
                foreach ($monthlist as $key => $value) {
                    if (strtoupper($value) == strtoupper($date)) {
                        $found = $key;
                        break;
                    }
                    ++$cnt;
                }
                $date = array_search($date, $monthlist);

                // Monthname found
                if ($cnt < 12) {
                    $fixday = 0;
                    if ($calc == 'add') {
                        $date += $found;
                        $calc = 'set';
                        if (self::$_options['extend_month'] === false) {
                            $parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
                            if ($parts['mday'] != $day) {
                                $fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
                            }
                        }
                    } else if ($calc == 'sub') {
                        $date = $month - $found;
                        $calc = 'set';
                        if (self::$_options['extend_month'] === false) {
                            $parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
                            if ($parts['mday'] != $day) {
                                $fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
                            }
                        }
                    }
                    return $this->_assign($calc, $this->mktime(0, 0, 0, $date, $day + $fixday, $year, true),
                                                 $this->mktime(0, 0, 0, $month, $day, $year, true), $hour);
                }

                // Monthname not found
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, month expected", 0, null, $date);
                break;

            case self::MONTH_SHORT:
                if (is_numeric($date) === true) {
                    $fixday = 0;
                    if ($calc === 'add') {
                        $date += $month;
                        $calc  = 'set';
                        if (self::$_options['extend_month'] === false) {
                            $parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
                            if ($parts['mday'] != $day) {
                                $fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
                            }
                        }
                    } else if ($calc === 'sub') {
                        $date = $month - $date;
                        $calc = 'set';
                        if (self::$_options['extend_month'] === false) {
                            $parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
                            if ($parts['mday'] != $day) {
                                $fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
                            }
                        }
                    }

                    return $this->_assign($calc, $this->mktime(0, 0, 0, $date,  $day + $fixday, $year, true),
                                                 $this->mktime(0, 0, 0, $month, $day,           $year, true), $hour);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, month expected", 0, null, $date);
                break;

            case self::MONTH_DAYS:
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception('month days not supported', 0, null, $date);
                break;

            case self::MONTH_NAME_NARROW:
                $monthlist = Zend_Locale_Data::getList($locale, 'month', array('gregorian', 'stand-alone', 'narrow'));
                $cnt       = 0;
                foreach ($monthlist as $key => $value) {
                    if (strtoupper($value) === strtoupper($date)) {
                        $found = $key;
                        break;
                    }
                    ++$cnt;
                }
                $date = array_search($date, $monthlist);

                // Monthname found
                if ($cnt < 12) {
                    $fixday = 0;
                    if ($calc === 'add') {
                        $date += $found;
                        $calc  = 'set';
                        if (self::$_options['extend_month'] === false) {
                            $parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
                            if ($parts['mday'] != $day) {
                                $fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
                            }
                        }
                    } else if ($calc === 'sub') {
                        $date = $month - $found;
                        $calc = 'set';
                        if (self::$_options['extend_month'] === false) {
                            $parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
                            if ($parts['mday'] != $day) {
                                $fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
                            }
                        }
                    }
                    return $this->_assign($calc, $this->mktime(0, 0, 0, $date,  $day + $fixday, $year, true),
                                                 $this->mktime(0, 0, 0, $month, $day,           $year, true), $hour);
                }

                // Monthname not found
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, month expected", 0, null, $date);
                break;

            // year formats
            case self::LEAPYEAR:
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception('leap year not supported', 0, null, $date);
                break;

            case self::YEAR_8601:
                if (is_numeric($date)) {
                    if ($calc === 'add') {
                        $date += $year;
                        $calc  = 'set';
                    } else if ($calc === 'sub') {
                        $date = $year - $date;
                        $calc = 'set';
                    }

                    return $this->_assign($calc, $this->mktime(0, 0, 0, $month, $day, intval($date), true),
                                                 $this->mktime(0, 0, 0, $month, $day, $year,         true), false);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, year expected", 0, null, $date);
                break;

            case self::YEAR:
                if (is_numeric($date)) {
                    if ($calc === 'add') {
                        $date += $year;
                        $calc  = 'set';
                    } else if ($calc === 'sub') {
                        $date = $year - $date;
                        $calc = 'set';
                    }

                    return $this->_assign($calc, $this->mktime(0, 0, 0, $month, $day, intval($date), true),
                                                 $this->mktime(0, 0, 0, $month, $day, $year,         true), false);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, year expected", 0, null, $date);
                break;

            case self::YEAR_SHORT:
                if (is_numeric($date)) {
                    $date = intval($date);
                    if (($calc == 'set') || ($calc == 'cmp')) {
                        $date = self::getFullYear($date);
                    }
                    if ($calc === 'add') {
                        $date += $year;
                        $calc  = 'set';
                    } else if ($calc === 'sub') {
                        $date = $year - $date;
                        $calc = 'set';
                    }

                    return $this->_assign($calc, $this->mktime(0, 0, 0, $month, $day, $date, true),
                                                 $this->mktime(0, 0, 0, $month, $day, $year, true), false);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, year expected", 0, null, $date);
                break;

            case self::YEAR_SHORT_8601:
                if (is_numeric($date)) {
                    $date = intval($date);
                    if (($calc === 'set') || ($calc === 'cmp')) {
                        $date = self::getFullYear($date);
                    }
                    if ($calc === 'add') {
                        $date += $year;
                        $calc  = 'set';
                    } else if ($calc === 'sub') {
                        $date = $year - $date;
                        $calc = 'set';
                    }

                    return $this->_assign($calc, $this->mktime(0, 0, 0, $month, $day, $date, true),
                                                 $this->mktime(0, 0, 0, $month, $day, $year, true), false);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, year expected", 0, null, $date);
                break;

            // time formats
            case self::MERIDIEM:
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception('meridiem not supported', 0, null, $date);
                break;

            case self::SWATCH:
                if (is_numeric($date)) {
                    $rest    = intval($date);
                    $hours   = floor($rest * 24 / 1000);
                    $rest    = $rest - ($hours * 1000 / 24);
                    $minutes = floor($rest * 1440 / 1000);
                    $rest    = $rest - ($minutes * 1000 / 1440);
                    $seconds = floor($rest * 86400 / 1000);
                    return $this->_assign($calc, $this->mktime($hours, $minutes, $seconds, 1, 1, 1970, true),
                                                 $this->mktime($hour,  $minute,  $second,  1, 1, 1970, true), false);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, swatchstamp expected", 0, null, $date);
                break;

            case self::HOUR_SHORT_AM:
                if (is_numeric($date)) {
                    return $this->_assign($calc, $this->mktime(intval($date), 0, 0, 1, 1, 1970, true),
                                                 $this->mktime($hour,         0, 0, 1, 1, 1970, true), false);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, hour expected", 0, null, $date);
                break;

            case self::HOUR_SHORT:
                if (is_numeric($date)) {
                    return $this->_assign($calc, $this->mktime(intval($date), 0, 0, 1, 1, 1970, true),
                                                 $this->mktime($hour,         0, 0, 1, 1, 1970, true), false);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, hour expected", 0, null, $date);
                break;

            case self::HOUR_AM:
                if (is_numeric($date)) {
                    return $this->_assign($calc, $this->mktime(intval($date), 0, 0, 1, 1, 1970, true),
                                                 $this->mktime($hour,         0, 0, 1, 1, 1970, true), false);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, hour expected", 0, null, $date);
                break;

            case self::HOUR:
                if (is_numeric($date)) {
                    return $this->_assign($calc, $this->mktime(intval($date), 0, 0, 1, 1, 1970, true),
                                                 $this->mktime($hour,         0, 0, 1, 1, 1970, true), false);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, hour expected", 0, null, $date);
                break;

            case self::MINUTE:
                if (is_numeric($date)) {
                    return $this->_assign($calc, $this->mktime(0, intval($date), 0, 1, 1, 1970, true),
                                                 $this->mktime(0, $minute,       0, 1, 1, 1970, true), false);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, minute expected", 0, null, $date);
                break;

            case self::SECOND:
                if (is_numeric($date)) {
                    return $this->_assign($calc, $this->mktime(0, 0, intval($date), 1, 1, 1970, true),
                                                 $this->mktime(0, 0, $second,       1, 1, 1970, true), false);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, second expected", 0, null, $date);
                break;

            case self::MILLISECOND:
                if (is_numeric($date)) {
                    switch($calc) {
                        case 'set' :
                            return $this->setMillisecond($date);
                            break;
                        case 'add' :
                            return $this->addMillisecond($date);
                            break;
                        case 'sub' :
                            return $this->subMillisecond($date);
                            break;
                    }

                    return $this->compareMillisecond($date);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, milliseconds expected", 0, null, $date);
                break;

            case self::MINUTE_SHORT:
                if (is_numeric($date)) {
                    return $this->_assign($calc, $this->mktime(0, intval($date), 0, 1, 1, 1970, true),
                                                 $this->mktime(0, $minute,       0, 1, 1, 1970, true), false);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, minute expected", 0, null, $date);
                break;

            case self::SECOND_SHORT:
                if (is_numeric($date)) {
                    return $this->_assign($calc, $this->mktime(0, 0, intval($date), 1, 1, 1970, true),
                                                 $this->mktime(0, 0, $second,       1, 1, 1970, true), false);
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, second expected", 0, null, $date);
                break;

            // timezone formats
            // break intentionally omitted
            case self::TIMEZONE_NAME:
            case self::TIMEZONE:
            case self::TIMEZONE_SECS:
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception('timezone not supported', 0, null, $date);
                break;

            case self::DAYLIGHT:
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception('daylight not supported', 0, null, $date);
                break;

            case self::GMT_DIFF:
            case self::GMT_DIFF_SEP:
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception('gmtdiff not supported', 0, null, $date);
                break;

            // date strings
            case self::ISO_8601:
                // (-)YYYY-MM-dd
                preg_match('/^(-{0,1}\d{4})-(\d{2})-(\d{2})/', $date, $datematch);
                // (-)YY-MM-dd
                if (empty($datematch)) {
                    preg_match('/^(-{0,1}\d{2})-(\d{2})-(\d{2})/', $date, $datematch);
                }
                // (-)YYYYMMdd
                if (empty($datematch)) {
                    preg_match('/^(-{0,1}\d{4})(\d{2})(\d{2})/', $date, $datematch);
                }
                // (-)YYMMdd
                if (empty($datematch)) {
                    preg_match('/^(-{0,1}\d{2})(\d{2})(\d{2})/', $date, $datematch);
                }
                $tmpdate = $date;
                if (!empty($datematch)) {
                    $dateMatchCharCount = iconv_strlen($datematch[0], 'UTF-8');
                    $tmpdate = iconv_substr($date,
                                            $dateMatchCharCount,
                                            iconv_strlen($date, 'UTF-8') - $dateMatchCharCount,
                                            'UTF-8');
                }
                // (T)hh:mm:ss
                preg_match('/[T,\s]{0,1}(\d{2}):(\d{2}):(\d{2})/', $tmpdate, $timematch);
                if (empty($timematch)) {
                    preg_match('/[T,\s]{0,1}(\d{2})(\d{2})(\d{2})/', $tmpdate, $timematch);
                }
                if (empty($datematch) and empty($timematch)) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception("unsupported ISO8601 format ($date)", 0, null, $date);
                }
                if (!empty($timematch)) {
                    $timeMatchCharCount = iconv_strlen($timematch[0], 'UTF-8');
                    $tmpdate = iconv_substr($tmpdate,
                                            $timeMatchCharCount,
                                            iconv_strlen($tmpdate, 'UTF-8') - $timeMatchCharCount,
                                            'UTF-8');
                }
                if (empty($datematch)) {
                    $datematch[1] = 1970;
                    $datematch[2] = 1;
                    $datematch[3] = 1;
                } else if (iconv_strlen($datematch[1], 'UTF-8') == 2) {
                    $datematch[1] = self::getFullYear($datematch[1]);
                }
                if (empty($timematch)) {
                    $timematch[1] = 0;
                    $timematch[2] = 0;
                    $timematch[3] = 0;
                }

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

            case self::RFC_2822:
                $result = preg_match('/^\w{3},\s(\d{1,2})\s(\w{3})\s(\d{4})\s(\d{2}):(\d{2}):{0,1}(\d{0,2})\s([+-]{1}\d{4})$/', $date, $match);
                if (!$result) {
                    require_once 'Zend/Date/Exception.php';
                    throw new Zend_Date_Exception("no RFC 2822 format ($date)", 0, null, $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], false),
                                             $this->mktime($hour,     $minute,   $second,   1 + $month,  1 + $day,      1970 + $year,     false), false);
                break;

            case self::TIMESTAMP:
                if (is_numeric($date)) {
                    return $this->_assign($calc, $date, $this->getUnixTimestamp());
                }

                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception("invalid date ($date) operand, timestamp expected", 0, null, $date);
                break;

            // additional formats
            // break intentionally omitted
            case self::ERA:
            case self::ERA_NAME:
                require_once 'Zend/Date/Exception.php';
                throw new Zend_Date_Exception('era not supported', 0, null, $date);
                break;

            case self::DATES:
                try {
                    $parsed = Zend_Locale_Format::getDate($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(), 0, $e, $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(), 0, $e, $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(), 0, $e, $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(), 0, $e, $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(), 0, $e, $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(), 0, $e, $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(), 0, $e, $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(), 0, $e, $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(), 0, $e, $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(), 0, $e, $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(), 0, $e, $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(), 0, $e, $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(), 0, $e, $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(), 0, $e, $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(), 0, $e, $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", 0, null, $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", 0, null, $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", 0, null, $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", 0, null, $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", 0, null, $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", 0, null, $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", 0, null, $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 (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']) ? $parsed['second'] : 0,
                            isset($parsed['month']) ? (1 + $parsed['month']) : 1,
                            isset($parsed['day']) ? (1 + $parsed['day']) : 1,
                            isset($parsed['year']) ? (1970 + $parsed['year']) : 1970,
                            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(), 0, $e, $date);
                        }
                    }
                }

                return $this->_assign($calc, $date, $this->getUnixTimestamp(), false);
                break;
        }
    }

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