date.php

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        return $output;

    }

    /**
     * Get this date/time in Unix time() format
     *
     * Get a representation of this date in Unix time() format.  This may only be
     * valid for dates from 1970 to ~2038.
     *
     * @access public
     * @return int number of seconds since the unix epoch
     */
    function getTime()
    {
        return $this->getDate(DATE_FORMAT_UNIXTIME);
    }

    /**
     * Sets the time zone of this Date
     *
     * Sets the time zone of this date with the given
     * Date_TimeZone object.  Does not alter the date/time,
     * only assigns a new time zone.  For conversion, use
     * convertTZ().
     *
     * @access public
     * @param object Date_TimeZone $tz the Date_TimeZone object to use, if called 
     * with a paramater that is not a Date_TimeZone object, will fall through to
     * setTZbyID(). 
     */
    function setTZ($tz)
    {
    	if(is_a($tz, 'Date_Timezone')) {
        	$this->tz = $tz;
    	} else {
    		$this->setTZbyID($tz);
    	}
    }

    /**
     * Sets the time zone of this date with the given time zone id
     *
     * Sets the time zone of this date with the given
     * time zone id, or to the system default if the
     * given id is invalid. Does not alter the date/time,
     * only assigns a new time zone.  For conversion, use
     * convertTZ().
     *
     * @access public
     * @param string id a time zone id
     */
    function setTZbyID($id)
    {
        if (Date_TimeZone::isValidID($id)) {
            $this->tz = new Date_TimeZone($id);
        } else {
            $this->tz = Date_TimeZone::getDefault();
        }
    }

    /**
     * Tests if this date/time is in DST
     *
     * Returns true if daylight savings time is in effect for
     * this date in this date's time zone.  See Date_TimeZone::inDaylightTime()
     * for compatability information.
     *
     * @access public
     * @return boolean true if DST is in effect for this date
     */
    function inDaylightTime()
    {
        return $this->tz->inDaylightTime($this);
    }

    /**
     * Converts this date to UTC and sets this date's timezone to UTC
     *
     * Converts this date to UTC and sets this date's timezone to UTC
     *
     * @access public
     */
    function toUTC()
    {
        if ($this->tz->getOffset($this) > 0) {
            $this->subtractSeconds(intval($this->tz->getOffset($this) / 1000));
        } else {
            $this->addSeconds(intval(abs($this->tz->getOffset($this)) / 1000));
        }
        $this->tz = new Date_TimeZone('UTC');
    }

    /**
     * Converts this date to a new time zone
     *
     * Converts this date to a new time zone.
     * WARNING: This may not work correctly if your system does not allow
     * putenv() or if localtime() does not work in your environment.  See
     * Date::TimeZone::inDaylightTime() for more information.
     *
     * @access public
     * @param object Date_TimeZone $tz the Date::TimeZone object for the conversion time zone
     */
    function convertTZ($tz)
    {
        // convert to UTC
        if ($this->tz->getOffset($this) > 0) {
            $this->subtractSeconds(intval(abs($this->tz->getOffset($this)) / 1000));
        } else {
            $this->addSeconds(intval(abs($this->tz->getOffset($this)) / 1000));
        }
        // convert UTC to new timezone
        if ($tz->getOffset($this) > 0) {
            $this->addSeconds(intval(abs($tz->getOffset($this)) / 1000));
        } else {
            $this->subtractSeconds(intval(abs($tz->getOffset($this)) / 1000));
        }
        $this->tz = $tz;
    }

    /**
     * Converts this date to a new time zone, given a valid time zone ID
     *
     * Converts this date to a new time zone, given a valid time zone ID
     * WARNING: This may not work correctly if your system does not allow
     * putenv() or if localtime() does not work in your environment.  See
     * Date::TimeZone::inDaylightTime() for more information.
     *
     * @access public
     * @param string id a time zone id
     */
    function convertTZbyID($id)
    {
       if (Date_TimeZone::isValidID($id)) {
          $tz = new Date_TimeZone($id);
       } else {
          $tz = Date_TimeZone::getDefault();
       }
       $this->convertTZ($tz);
    }

    function toUTCbyOffset($offset)
    {
        if ($offset == "Z" || $offset == "+00:00" || $offset == "+0000") {
            $this->toUTC();
            return true;
        }

        if (preg_match('/([\+\-])(\d{2}):?(\d{2})/', $offset, $regs)) {
            // convert offset to seconds
            $hours  = (int) isset($regs[2])?$regs[2]:0;
            $mins   = (int) isset($regs[3])?$regs[3]:0;
            $offset = ($hours * 3600) + ($mins * 60);

            if (isset($regs[1]) && $regs[1] == "-") {
                $offset *= -1;
            }

            if ($offset > 0) {
                $this->subtractSeconds(intval($offset));
            } else {
                $this->addSeconds(intval(abs($offset)));
            }

            $this->tz = new Date_TimeZone('UTC');
            return true;
        }

        return false;
    }

    /**
     * Adds a given number of seconds to the date
     *
     * Adds a given number of seconds to the date
     *
     * @access public
     * @param int $sec the number of seconds to add
     */
    function addSeconds($sec)
    {
        $this->addSpan(new Date_Span((integer)$sec));
    }

    /**
     * Adds a time span to the date
     *
     * Adds a time span to the date
     *
     * @access public
     * @param object Date_Span $span the time span to add
     */
    function addSpan($span)
    {
        if (!is_a($span, 'Date_Span')) {
            return;
        }

        $this->second += $span->second;
        if ($this->second >= 60) {
            $this->minute++;
            $this->second -= 60;
        }

        $this->minute += $span->minute;
        if ($this->minute >= 60) {
            $this->hour++;
            if ($this->hour >= 24) {
                list($this->year, $this->month, $this->day) =
                    sscanf(Date_Calc::nextDay($this->day, $this->month, $this->year), "%04s%02s%02s");
                $this->hour -= 24;
            }
            $this->minute -= 60;
        }

        $this->hour += $span->hour;
        if ($this->hour >= 24) {
            list($this->year, $this->month, $this->day) =
                sscanf(Date_Calc::nextDay($this->day, $this->month, $this->year), "%04s%02s%02s");
            $this->hour -= 24;
        }

        $d = Date_Calc::dateToDays($this->day, $this->month, $this->year);
        $d += $span->day;

        list($this->year, $this->month, $this->day) =
            sscanf(Date_Calc::daysToDate($d), "%04s%02s%02s");
        $this->year  = intval($this->year);
        $this->month = intval($this->month);
        $this->day   = intval($this->day);
    }

    /**
     * Subtracts a given number of seconds from the date
     *
     * Subtracts a given number of seconds from the date
     *
     * @access public
     * @param int $sec the number of seconds to subtract
     */
    function subtractSeconds($sec)
    {
        $this->subtractSpan(new Date_Span($sec));
    }

    /**
     * Subtracts a time span to the date
     *
     * Subtracts a time span to the date
     *
     * @access public
     * @param object Date_Span $span the time span to subtract
     */
    function subtractSpan($span)
    {
        if (!is_a($span, 'Date_Span')) {
            return;
        }
        if ($span->isEmpty()) {
            return;
        }

        $this->second -= $span->second;
        if ($this->second < 0) {
            $this->minute--;
            $this->second += 60;
        }

        $this->minute -= $span->minute;
        if ($this->minute < 0) {
            $this->hour--;
            if ($this->hour < 0) {
                list($this->year, $this->month, $this->day) =
                    sscanf(Date_Calc::prevDay($this->day, $this->month, $this->year), "%04s%02s%02s");
                $this->hour += 24;
            }
            $this->minute += 60;
        }

        $this->hour -= $span->hour;
        if ($this->hour < 0) {
            list($this->year, $this->month, $this->day) =
                sscanf(Date_Calc::prevDay($this->day, $this->month, $this->year), "%04s%02s%02s");
            $this->hour += 24;
        }

        $d = Date_Calc::dateToDays($this->day, $this->month, $this->year);
        $d -= $span->day;

        list($this->year, $this->month, $this->day) =
            sscanf(Date_Calc::daysToDate($d), "%04s%02s%02s");
        $this->year  = intval($this->year);
        $this->month = intval($this->month);
        $this->day   = intval($this->day);
    }

    /**
     * Compares two dates
     *
     * Compares two dates.  Suitable for use
     * in sorting functions.
     *
     * @access public
     * @param object Date $d1 the first date
     * @param object Date $d2 the second date
     * @return int 0 if the dates are equal, -1 if d1 is before d2, 1 if d1 is after d2
     */
    function compare($d1, $d2)
    {
        $d1->convertTZ(new Date_TimeZone('UTC'));
        $d2->convertTZ(new Date_TimeZone('UTC'));
        $days1 = Date_Calc::dateToDays($d1->day, $d1->month, $d1->year);
        $days2 = Date_Calc::dateToDays($d2->day, $d2->month, $d2->year);
        if ($days1 < $days2) return -1;
        if ($days1 > $days2) return 1;
        if ($d1->hour < $d2->hour) return -1;
        if ($d1->hour > $d2->hour) return 1;
        if ($d1->minute < $d2->minute) return -1;
        if ($d1->minute > $d2->minute) return 1;
        if ($d1->second < $d2->second) return -1;
        if ($d1->second > $d2->second) return 1;
        return 0;
    }

    /**
     * Test if this date/time is before a certain date/time
     *
     * Test if this date/time is before a certain date/time
     *
     * @access public
     * @param object Date $when the date to test against
     * @return boolean true if this date is before $when
     */
    function before($when)
    {
        if (Date::compare($this,$when) == -1) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * Test if this date/time is after a certian date/time
     *
     * Test if this date/time is after a certian date/time
     *
     * @access public
     * @param object Date $when the date to test against
     * @return boolean true if this date is after $when
     */
    function after($when)
    {
        if (Date::compare($this,$when) == 1) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * Test if this date/time is exactly equal to a certian date/time
     *
     * Test if this date/time is exactly equal to a certian date/time
     *
     * @access public
     * @param object Date $when the date to test against
     * @return boolean true if this date is exactly equal to $when
     */
    function equals($when)
    {
        if (Date::compare($this,$when) == 0) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * Determine if this date is in the future
     *
     * Determine if this date is in the future
     *
     * @access public
     * @return boolean true if this date is in the future
     */
    function isFuture()
    {
        $now = new Date();
        if ($this->after($now)) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * Determine if this date is in the past
     *
     * Determine if this date is in the past