egroupware/phpgwapi/inc/class.datetime.inc.php

<?php
  /**************************************************************************\
  * phpGroupWare API - Commononly used functions                             *
  * This file written by Dan Kuykendall <seek3r@phpgroupware.org>            *
  * and Joseph Engo <jengo@phpgroupware.org>                                 *
  * and Mark Peters <skeeter@phpgroupware.org>                               *
  * Commononly used functions by phpGroupWare developers                     *
  * Copyright (C) 2000, 2001 Dan Kuykendall                                  *
  * -------------------------------------------------------------------------*
  * This library is part of the phpGroupWare API                             *
  * http://www.phpgroupware.org/api                                          * 
  * ------------------------------------------------------------------------ *
  * This library is free software; you can redistribute it and/or modify it  *
  * under the terms of the GNU Lesser General Public License as published by *
  * the Free Software Foundation; either version 2.1 of the License,         *
  * or any later version.                                                    *
  * This library is distributed in the hope that it will be useful, but      *
  * WITHOUT ANY WARRANTY; without even the implied warranty of               *
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                     *
  * See the GNU Lesser General Public License for more details.              *
  * You should have received a copy of the GNU Lesser General Public License *
  * along with this library; if not, write to the Free Software Foundation,  *
  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA            *
  \**************************************************************************/

	/* $Id$ */

	$d1 = strtolower(@substr(PHPGW_API_INC,0,3));
	$d2 = strtolower(@substr(PHPGW_SERVER_ROOT,0,3));
	$d3 = strtolower(@substr(PHPGW_APP_INC,0,3));
	if($d1 == 'htt' || $d1 == 'ftp' || $d2 == 'htt' || $d2 == 'ftp' || $d3 == 'htt' || $d3 == 'ftp')
	{
		echo 'Failed attempt to break in via an old Security Hole!<br>'."\n";
		exit;
	}
	unset($d1);
	unset($d2);
	unset($d3);
		
	/*!
	@class datetime
	@abstract datetime class that contains common date/time functions
	*/
	class datetime
	{
		var $tz_offset;
		var $TZs = Array();
		var $days = Array();
		var $gmtnow = 0;
		var $users_localtime;
		var $gmtdate;

		function datetime()
		{
			$this->tz_offset = 3600 * intval($GLOBALS['phpgw_info']['user']['preferences']['common']['tz_offset']);
			print_debug('datetime::datetime::gmtnow',$this->gmtnow,'api');

			$error_occured = True;
			// If we already have a GMT time, no need to do this again.
			if(!$this->gmtnow)
			{
				if(isset($GLOBALS['phpgw_info']['server']['tz_offset']))
				{
					$this->gmtnow = time() - (intval($GLOBALS['phpgw_info']['server']['tz_offset']) * 3600);
				}
				else
				{
					$this->gmtnow = time() - ($this->getbestguess() * 3600);
				}
			}
			$this->users_localtime = $this->gmtnow + $this->tz_offset;
		}
		
		function getntpoffset()
		{
			$error_occured = False;
			if(!@is_object($GLOBALS['phpgw']->network))
			{
				$GLOBALS['phpgw']->network = createobject('phpgwapi.network');
			}
			$server_time = time();

			if($GLOBALS['phpgw']->network->open_port('129.6.15.28',13,5))
			{
				$line = $GLOBALS['phpgw']->network->bs_read_port(64);
				$GLOBALS['phpgw']->network->close_port();

				$array = explode(' ',$line);
				// host: 129.6.15.28
				// Value returned is 52384 02-04-20 13:55:29 50 0 0   9.2 UTC(NIST) *
				print_debug('Server datetime',time(),'api');
				print_debug('Temporary NTP datetime',$line,'api');
				if ($array[5] == 4)
				{
					$error_occured = True;
				}
				else
				{
					$date = explode('-',$array[1]);
					$time = explode(':',$array[2]);
					$this->gmtnow = mktime(intval($time[0]),intval($time[1]),intval($time[2]),intval($date[1]),intval($date[2]),intval($date[0]) + 2000);
					print_debug('Temporary RFC epoch',$this->gmtnow,'api');
					print_debug('GMT',date('Ymd H:i:s',$this->gmtnow),'api');
				}
			}
			else
			{
				$error_occured = True;
			}
			
			if($error_occured == True)
			{
				return $this->getbestguess();
			}
			else
			{
				return intval(($server_time - $this->gmtnow) / 3600);
			}
		}

		function gethttpoffset()
		{
			$error_occured = False;
			if(!@is_object($GLOBALS['phpgw']->network))
			{
				$GLOBALS['phpgw']->network = createobject('phpgwapi.network');
			}
			$server_time = time();

			$filename = 'http://132.163.4.213/timezone.cgi?GMT';
			$file = $GLOBALS['phpgw']->network->gethttpsocketfile($filename);
			if(!$file)
			{
				return $this->getbestguess();
			}
			$time = strip_tags($file[55]);
			$date = strip_tags($file[56]);

			print_debug('GMT DateTime',$date.' '.$time,'api');
			$dt_array = explode(' ',$date);
			$temp_datetime = $dt_array[0].' '.substr($dt_array[2],0,-1).' '.substr($dt_array[1],0,3).' '.$dt_array[3].' '.$time.' GMT';
			print_debug('Reformulated GMT DateTime',$temp_datetime,'api');
			$this->gmtnow = $this->convert_rfc_to_epoch($temp_datetime);
			print_debug('this->gmtnow',$this->gmtnow,'api');
			print_debug('server time',$server_time,'api');
			print_debug('server DateTime',date('D, d M Y H:i:s',$server_time),'api');
			return intval(($server_time - $this->gmtnow) / 3600);
		}

		function getbestguess()
		{
			print_debug('datetime::datetime::debug: Inside getting from local server','api');
			$server_time = time();
			// Calculate GMT time...
			// If DST, add 1 hour...
			//  - (date('I') == 1?3600:0)
			$this->gmtnow = $this->convert_rfc_to_epoch(gmdate('D, d M Y H:i:s',$server_time).' GMT');
			return intval(($server_time - $this->gmtnow) / 3600);
		}

		function convert_rfc_to_epoch($date_str)
		{
			$comma_pos = strpos($date_str,',');
			if($comma_pos)
			{
				$date_str = substr($date_str,$comma_pos+1);
			}

			// This may need to be a reference to the different months in native tongue....
			$month= array(
				'Jan' => 1,
				'Feb' => 2,
				'Mar' => 3,
				'Apr' => 4,
				'May' => 5,
				'Jun' => 6,
				'Jul' => 7,
				'Aug' => 8,
				'Sep' => 9,
				'Oct' => 10,
				'Nov' => 11,
				'Dec' => 12
			);
			$dta = array();
			$ta = array();

			// Convert "15 Jul 2000 20:50:22 +0200" to unixtime
			$dta = explode(' ',$date_str);
			$ta = explode(':',$dta[4]);

			if(substr($dta[5],0,3) <> 'GMT')
			{
				$tzoffset = substr($dta[5],0,1);
				$tzhours = intval(substr($dta[5],1,2));
				$tzmins = intval(substr($dta[5],3,2));
				switch ($tzoffset)
				{
					case '-':
						(int)$ta[0] += $tzhours;
						(int)$ta[1] += $tzmins;
						break;
					case '+':
						(int)$ta[0] -= $tzhours;
						(int)$ta[1] -= $tzmins;
						break;
				}
			}
			return mktime($ta[0],$ta[1],$ta[2],$month[$dta[2]],$dta[1],$dta[3]);
		}

		function get_weekday_start($year,$month,$day)
		{
			$weekday = $this->day_of_week($year,$month,$day);
			switch($GLOBALS['phpgw_info']['user']['preferences']['calendar']['weekdaystarts'])
			{
				// Saturday is for arabic support
				case 'Saturday':
					$this->days = Array(
						0 => Array(
							'name'	=> 'Sat',
							'weekday'	=> 0
						),
						1 => Array(
							'name'	=> 'Sun',
							'weekday'	=> 0
						),
						2 => Array(
							'name'	=> 'Mon',
							'weekday'	=> 1
						),
						3 => Array(
							'name'	=> 'Tue',
							'weekday'	=> 1
						),
						4 => Array(
							'name'	=> 'Wed',
							'weekday'	=> 1
						),
						5 => Array(
							'name'	=> 'Thu',
							'weekday'	=> 1
						),
						6 => Array(
							'name'	=> 'Fri',
							'weekday'	=> 1
						)
					);
					switch($weekday)
					{
						case 0:
							$sday = mktime(2,0,0,$month,$day - 1,$year);
							break;
						case 6:
							$sday = mktime(2,0,0,$month,$day,$year);
							break;
						default:
							$sday = mktime(2,0,0,$month,$day - ($weekday + 1),$year);
							break;
					}
					break;
				case 'Monday':
					$this->days = Array(
						0 => Array(
							'name'	=> 'Mon',
							'weekday'	=> 1
						),
						1 => Array(
							'name'	=> 'Tue',
							'weekday'	=> 1
						),
						2 => Array(
							'name'	=> 'Wed',
							'weekday'	=> 1
						),
						3 => Array(
							'name'	=> 'Thu',
							'weekday'	=> 1
						),
						4 => Array(
							'name'	=> 'Fri',
							'weekday'	=> 1
						),
						5 => Array(
							'name'	=> 'Sat',
							'weekday'	=> 0
						),
						6 => Array(
							'name'	=> 'Sun',
							'weekday'	=> 0
						)
					);
					switch($weekday)
					{
						case 0:
							$sday = mktime(2,0,0,$month,$day - 6,$year);
							break;
						case 1:
							$sday = mktime(2,0,0,$month,$day,$year);
							break;
						default:
							$sday = mktime(2,0,0,$month,$day - ($weekday - 1),$year);
							break;
					}
					break;
				case 'Sunday':
				default:
					$this->days = Array(
						0 => Array(
							'name'	=> 'Sun',
							'weekday'	=> 0
						),
						1 => Array(
							'name'	=> 'Mon',
							'weekday'	=> 1
						),
						2 => Array(
							'name'	=> 'Tue',
							'weekday'	=> 1
						),
						3 => Array(
							'name'	=> 'Wed',
							'weekday'	=> 1
						),
						4 => Array(
							'name'	=> 'Thu',
							'weekday'	=> 1
						),
						5 => Array(
							'name'	=> 'Fri',
							'weekday'	=> 1
						),
						6 => Array(
							'name'	=> 'Sat',
							'weekday'	=> 0
						)
					);
					$sday = mktime(2,0,0,$month,$day - $weekday,$year);
					break;
			}
			return $sday - 7200;
		}

		function is_leap_year($year)
		{
			if ((intval($year) % 4 == 0) && (intval($year) % 100 != 0) || (intval($year) % 400 == 0))
			{
				return 1;
			}
			else
			{
				return 0;
			}
		}

		function days_in_month($month,$year)
		{
			$days = Array(
				1	=>	31,
				2	=>	28 + $this->is_leap_year(intval($year)),
				3	=>	31,
				4	=>	30,
				5	=>	31,
				6	=>	30,
				7	=>	31,
				8	=>	31,
				9	=>	30,
				10	=>	31,
				11	=>	30,
				12	=>	31
			);
			return $days[intval($month)];
		}

		function date_valid($year,$month,$day)
		{
			return checkdate(intval($month),intval($day),intval($year));
		}

		function time_valid($hour,$minutes,$seconds)
		{
			if(intval($hour) < 0 || intval($hour) > 24)
			{
				return False;
			}
			if(intval($minutes) < 0 || intval($minutes) > 59)
			{
				return False;
			}
			if(intval($seconds) < 0 || intval($seconds) > 59)
			{
				return False;
			}

			return True;
		}

		function day_of_week($year,$month,$day)
		{
			if($month > 2)
			{
				$month -= 2;
			}
			else
			{
				$month += 10;
				$year--;
			}
			$day = (floor((13 * $month - 1) / 5) + $day + ($year % 100) + floor(($year % 100) / 4) + floor(($year / 100) / 4) - 2 * floor($year / 100) + 77);
			return (($day - 7 * floor($day / 7)));
		}
	
		function day_of_year($year,$month,$day)
		{
			$days = array(0,31,59,90,120,151,181,212,243,273,304,334);

			$julian = ($days[$month - 1] + $day);

			if($month > 2 && $this->is_leap_year($year))
			{
				$julian++;
			}
			return($julian);
		}

		/*!
		@function days_between
		@abstract Get the number of days between two dates
		@author Steven Cramer
		@param $m1 - Month_1, $d1 - Day_1, $y1 - Year_1, $m2 - Month_2, $d2 - Day_2, $y2 - Year_2
		*/
		function days_between($m1,$d1,$y1,$m2,$d2,$y2)
		{
//			$start = "$d1.$m1.$y1";

			if ($y1 == $y2 && $m1 == $m2)
			{
				$days = $d2 - $d1;
			}
			else
 			{
				$days = $this->days_in_month($m1,$y1) - $d1;
				while ($m1 != $m2 || $y1 != $y2)
				{
					if ($m1+1 == 13)
					{
						$m1 = 1;
						$y1++;
					}
					else 
					{
						$m1++;
					}

					if ($m1 != $m2 || $y1 != $y2)
					{
						$days += $this->days_in_month($m1,$y1);
					}
				}
				$days += $d2;
			}
			return $days;
		}

		function date_compare($a_year,$a_month,$a_day,$b_year,$b_month,$b_day)
		{
			$a_date = mktime(0,0,0,intval($a_month),intval($a_day),intval($a_year));
			$b_date = mktime(0,0,0,intval($b_month),intval($b_day),intval($b_year));
			if($a_date == $b_date)
			{
				return 0;
			}
			elseif($a_date > $b_date)
			{
				return 1;
			}
			elseif($a_date < $b_date)
			{
				return -1;
			}
		}

		function time_compare($a_hour,$a_minute,$a_second,$b_hour,$b_minute,$b_second)
		{
			$a_time = mktime(intval($a_hour),intval($a_minute),intval($a_second),0,0,70);
			$b_time = mktime(intval($b_hour),intval($b_minute),intval($b_second),0,0,70);
			if($a_time == $b_time)
			{
				return 0;
			}
			elseif($a_time > $b_time)
			{
				return 1;
			}
			elseif($a_time < $b_time)
			{
				return -1;
			}
		}

		function makegmttime($hour,$minute,$second,$month,$day,$year)
		{
			return $this->gmtdate(mktime($hour, $minute, $second, $month, $day, $year));
		}

		function localdates($localtime)
		{
			$date = Array('raw','day','month','year','full','dow','dm','bd');
			$date['raw'] = $localtime;
			$date['year'] = intval($GLOBALS['phpgw']->common->show_date($date['raw'],'Y'));
			$date['month'] = intval($GLOBALS['phpgw']->common->show_date($date['raw'],'m'));
			$date['day'] = intval($GLOBALS['phpgw']->common->show_date($date['raw'],'d'));
			$date['full'] = intval($GLOBALS['phpgw']->common->show_date($date['raw'],'Ymd'));
			$date['bd'] = mktime(0,0,0,$date['month'],$date['day'],$date['year']);
			$date['dm'] = intval($GLOBALS['phpgw']->common->show_date($date['raw'],'dm'));
			$date['dow'] = $this->day_of_week($date['year'],$date['month'],$date['day']);
			$date['hour'] = intval($GLOBALS['phpgw']->common->show_date($date['raw'],'H'));
			$date['minute'] = intval($GLOBALS['phpgw']->common->show_date($date['raw'],'i'));
			$date['second'] = intval($GLOBALS['phpgw']->common->show_date($date['raw'],'s'));
		
			return $date;
		}

		function gmtdate($localtime)
		{
			return $this->localdates($localtime - $this->tz_offset);
		}

		function timezone_list()
		{
			$this->TZs = Array(
				'US/Alaska',
				'US/Aleutian',
				'US/Arizona',
				'US/Central',
				'US/Eastern',
				'US/East-Indiana',
				'US/Hawaii',
				'US/Indiana-Starke',
				'US/Michigan',
				'US/Mountain',
				'US/Pacific',
				'US/Samoa',
				'Africa/Abidjan',
				'Africa/Accra',
				'Africa/Addis_Ababa',
				'Africa/Algiers',
				'Africa/Asmera',
				'Africa/Bamako',
				'Africa/Bangui',
				'Africa/Banjul',
				'Africa/Bissau',
				'Africa/Blantyre',
				'Africa/Brazzaville',
				'Africa/Bujumbura',
				'Africa/Cairo',
				'Africa/Casablanca',
				'Africa/Ceuta',
				'Africa/Conakry',
				'Africa/Dakar',
				'Africa/Dar_es_Salaam',
				'Africa/Djibouti',
				'Africa/Douala',
				'Africa/El_Aaiun',
				'Africa/Freetown',
				'Africa/Gaborone',
				'Africa/Harare',
				'Africa/Johannesburg',
				'Africa/Kampala',
				'Africa/Khartoum',
				'Africa/Kigali',
				'Africa/Kinshasa',
				'Africa/Lagos',
				'Africa/Libreville',
				'Africa/Lome',
				'Africa/Luanda',
				'Africa/Lubumbashi',
				'Africa/Lusaka',
				'Africa/Malabo',
				'Africa/Maputo',
				'Africa/Maseru',
				'Africa/Mbabane',
				'Africa/Mogadishu',
				'Africa/Monrovia',
				'Africa/Nairobi',
				'Africa/Ndjamena',
				'Africa/Niamey',
				'Africa/Nouakchott',
				'Africa/Ouagadougou',
				'Africa/Porto-Novo',
				'Africa/Sao_Tome',
				'Africa/Timbuktu',
				'Africa/Tripoli',
				'Africa/Tunis',
				'Africa/Windhoek',
				'America/Adak',
				'America/Anchorage',
				'America/Anguilla',
				'America/Antigua',
				'America/Araguaina',
				'America/Aruba',
				'America/Asuncion',
				'America/Atka',
				'America/Barbados',
				'America/Belem',
				'America/Belize',
				'America/Boa_Vista',
				'America/Bogota',
				'America/Boise',
				'America/Buenos_Aires',
				'America/Cambridge_Bay',
				'America/Cancun',
				'America/Caracas',
				'America/Catamarca',
				'America/Cayenne',
				'America/Cayman',
				'America/Chicago',
				'America/Chihuahua',
				'America/Cordoba',
				'America/Costa_Rica',
				'America/Cuiaba',
				'America/Curacao',
				'America/Dawson',
				'America/Dawson_Creek',
				'America/Denver',
				'America/Detroit',
				'America/Dominica',
				'America/Edmonton',
				'America/El_Salvador',
				'America/Ensenada',
				'America/Fortaleza',
				'America/Fort_Wayne',
				'America/Glace_Bay',
				'America/Godthab',
				'America/Goose_Bay',
				'America/Grand_Turk',
				'America/Grenada',
				'America/Guadeloupe',
				'America/Guatemala',
				'America/Guayaquil',
				'America/Guyana',
				'America/Halifax',
				'America/Havana',
				'America/Hermosillo',
				'America/Indiana/Indianapolis',
				'America/Indiana/Knox',
				'America/Indiana/Marengo',
				'America/Indiana/Vevay',
				'America/Indianapolis',
				'America/Inuvik',
				'America/Iqaluit',
				'America/Jamaica',
				'America/Jujuy',
				'America/Juneau',
				'America/Knox_IN',
				'America/La_Paz',
				'America/Lima',
				'America/Los_Angeles',
				'America/Louisville',
				'America/Maceio',
				'America/Managua',
				'America/Manaus',
				'America/Martinique',
				'America/Mazatlan',
				'America/Mendoza',
				'America/Menominee',
				'America/Mexico_City',
				'America/Miquelon',
				'America/Montevideo',
				'America/Montreal',
				'America/Montserrat',
				'America/Nassau',
				'America/New_York',
				'America/Nipigon',
				'America/Nome',
				'America/Noronha',
				'America/Panama',
				'America/Pangnirtung',
				'America/Paramaribo',
				'America/Phoenix',
				'America/Port-au-Prince',
				'America/Porto_Acre',
				'America/Port_of_Spain',
				'America/Porto_Velho',
				'America/Puerto_Rico',
				'America/Rainy_River',
				'America/Rankin_Inlet',
				'America/Regina',
				'America/Rosario',
				'America/Santiago',
				'America/Santo_Domingo',
				'America/Sao_Paulo',
				'America/Scoresbysund',
				'America/Shiprock',
				'America/St_Johns',
				'America/St_Kitts',
				'America/St_Lucia',
				'America/St_Thomas',
				'America/St_Vincent',
				'America/Swift_Current',
				'America/Tegucigalpa',
				'America/Thule',
				'America/Thunder_Bay',
				'America/Tijuana',
				'America/Tortola',
				'America/Vancouver',
				'America/Virgin',
				'America/Whitehorse',
				'America/Winnipeg',
				'America/Yakutat',
				'America/Yellowknife',
				'Antarctica/Casey',
				'Antarctica/Davis',
				'Antarctica/DumontDUrville',
				'Antarctica/Mawson',
				'Antarctica/McMurdo',
				'Antarctica/Palmer',
				'Antarctica/South_Pole',
				'Antarctica/Syowa',
				'Arctic/Longyearbyen',
				'Asia/Aden',
				'Asia/Almaty',
				'Asia/Amman',
				'Asia/Anadyr',
				'Asia/Aqtau',
				'Asia/Aqtobe',
				'Asia/Ashkhabad',
				'Asia/Baghdad',
				'Asia/Bahrain',
				'Asia/Baku',
				'Asia/Bangkok',
				'Asia/Beirut',
				'Asia/Bishkek',
				'Asia/Brunei',
				'Asia/Calcutta',
				'Asia/Chungking',
				'Asia/Colombo',
				'Asia/Dacca',
				'Asia/Damascus',
				'Asia/Dili',
				'Asia/Dubai',
				'Asia/Dushanbe',
				'Asia/Gaza',
				'Asia/Harbin',
				'Asia/Hong_Kong',
				'Asia/Hovd',
				'Asia/Irkutsk',
				'Asia/Istanbul',
				'Asia/Jakarta',
				'Asia/Jayapura',
				'Asia/Jerusalem',
				'Asia/Kabul',
				'Asia/Kamchatka',
				'Asia/Karachi',
				'Asia/Kashgar',
				'Asia/Katmandu',
				'Asia/Krasnoyarsk',
				'Asia/Kuala_Lumpur',
				'Asia/Kuching',
				'Asia/Kuwait',
				'Asia/Macao',
				'Asia/Magadan',
				'Asia/Manila',
				'Asia/Muscat',
				'Asia/Nicosia',
				'Asia/Novosibirsk',
				'Asia/Omsk',
				'Asia/Phnom_Penh',
				'Asia/Pyongyang',
				'Asia/Qatar',
				'Asia/Rangoon',
				'Asia/Riyadh',
				'Asia/Riyadh87',
				'Asia/Riyadh88',
				'Asia/Riyadh89',
				'Asia/Saigon',
				'Asia/Samarkand',
				'Asia/Seoul',
				'Asia/Shanghai',
				'Asia/Singapore',
				'Asia/Taipei',
				'Asia/Tashkent',
				'Asia/Tbilisi',
				'Asia/Tehran',
				'Asia/Tel_Aviv',
				'Asia/Thimbu',
				'Asia/Tokyo',
				'Asia/Ujung_Pandang',
				'Asia/Ulaanbaatar',
				'Asia/Ulan_Bator',
				'Asia/Urumqi',
				'Asia/Vientiane',
				'Asia/Vladivostok',
				'Asia/Yakutsk',
				'Asia/Yekaterinburg',
				'Asia/Yerevan',
				'Atlantic/Azores',
				'Atlantic/Bermuda',
				'Atlantic/Canary',
				'Atlantic/Cape_Verde',
				'Atlantic/Faeroe',
				'Atlantic/Jan_Mayen',
				'Atlantic/Madeira',
				'Atlantic/Reykjavik',
				'Atlantic/South_Georgia',
				'Atlantic/Stanley',
				'Atlantic/St_Helena',
				'Australia/ACT',
				'Australia/Adelaide',
				'Australia/Brisbane',
				'Australia/Broken_Hill',
				'Australia/Canberra',
				'Australia/Darwin',
				'Australia/Hobart',
				'Australia/LHI',
				'Australia/Lindeman',
				'Australia/Lord_Howe',
				'Australia/Melbourne',
				'Australia/North',
				'Australia/NSW',
				'Australia/Perth',
				'Australia/Queensland',
				'Australia/South',
				'Australia/Sydney',
				'Australia/Tasmania',
				'Australia/Victoria',
				'Australia/West',
				'Australia/Yancowinna',
				'Brazil/Acre',
				'Brazil/DeNoronha',
				'Brazil/East',
				'Brazil/West',
				'Canada/Atlantic',
				'Canada/Central',
				'Canada/Eastern',
				'Canada/East-Saskatchewan',
				'Canada/Mountain',
				'Canada/Newfoundland',
				'Canada/Pacific',
				'Canada/Saskatchewan',
				'Canada/Yukon',
				'CET',
				'Chile/Continental',
				'Chile/EasterIsland',
				'China/Beijing',
				'China/Shanghai',
				'CST6CDT',
				'Cuba',
				'EET',
				'Egypt',
				'Eire',
				'EST',
				'EST5EDT',
				'Europe/Amsterdam',
				'Europe/Andorra',
				'Europe/Athens',
				'Europe/Belfast',
				'Europe/Belgrade',
				'Europe/Berlin',
				'Europe/Bratislava',
				'Europe/Brussels',
				'Europe/Bucharest',
				'Europe/Budapest',
				'Europe/Chisinau',
				'Europe/Copenhagen',
				'Europe/Dublin',
				'Europe/Gibraltar',
				'Europe/Helsinki',
				'Europe/Istanbul',
				'Europe/Kaliningrad',
				'Europe/Kiev',
				'Europe/Lisbon',
				'Europe/Ljubljana',
				'Europe/London',
				'Europe/Luxembourg',
				'Europe/Madrid',
				'Europe/Malta',
				'Europe/Minsk',
				'Europe/Monaco',
				'Europe/Moscow',
				'Europe/Oslo',
				'Europe/Paris',
				'Europe/Prague',
				'Europe/Riga',
				'Europe/Rome',
				'Europe/Samara',
				'Europe/San_Marino',
				'Europe/Sarajevo',
				'Europe/Simferopol',
				'Europe/Skopje',
				'Europe/Sofia',
				'Europe/Stockholm',
				'Europe/Tallinn',
				'Europe/Tirane',
				'Europe/Tiraspol',
				'Europe/Uzhgorod',
				'Europe/Vaduz',
				'Europe/Vatican',
				'Europe/Vienna',
				'Europe/Vilnius',
				'Europe/Warsaw',
				'Europe/Zagreb',
				'Europe/Zaporozhye',
				'Europe/Zurich',
				'Factory',
				'GB',
				'GB-Eire',
				'GMT',
				'GMT0',
				'GMT-0',
				'GMT+0',
				'Greenwich',
				'Hongkong',
				'HST',
				'Iceland',
				'Indian/Antananarivo',
				'Indian/Chagos',
				'Indian/Christmas',
				'Indian/Cocos',
				'Indian/Comoro',
				'Indian/Kerguelen',
				'Indian/Mahe',
				'Indian/Maldives',
				'Indian/Mauritius',
				'Indian/Mayotte',
				'Indian/Reunion',
				'Iran',
				'Israel',
				'Jamaica',
				'Japan',
				'Kwajalein',
				'Libya',
				'MET',
				'Mexico/BajaNorte',
				'Mexico/BajaSur',
				'Mexico/General',
				'Mideast/Riyadh87',
				'Mideast/Riyadh88',
				'Mideast/Riyadh89',
				'MST',
				'MST7MDT',
				'Navajo',
				'NZ',
				'NZ-CHAT',
				'Pacific/Apia',
				'Pacific/Auckland',
				'Pacific/Chatham',
				'Pacific/Easter',
				'Pacific/Efate',
				'Pacific/Enderbury',
				'Pacific/Fakaofo',
				'Pacific/Fiji',
				'Pacific/Funafuti',
				'Pacific/Galapagos',
				'Pacific/Gambier',
				'Pacific/Guadalcanal',
				'Pacific/Guam',
				'Pacific/Honolulu',
				'Pacific/Johnston',
				'Pacific/Kiritimati',
				'Pacific/Kosrae',
				'Pacific/Kwajalein',
				'Pacific/Majuro',
				'Pacific/Marquesas',
				'Pacific/Midway',
				'Pacific/Nauru',
				'Pacific/Niue',
				'Pacific/Norfolk',
				'Pacific/Noumea',
				'Pacific/Pago_Pago',
				'Pacific/Palau',
				'Pacific/Pitcairn',
				'Pacific/Ponape',
				'Pacific/Port_Moresby',
				'Pacific/Rarotonga',
				'Pacific/Saipan',
				'Pacific/Samoa',
				'Pacific/Tahiti',
				'Pacific/Tarawa',
				'Pacific/Tongatapu',
				'Pacific/Truk',
				'Pacific/Wake',
				'Pacific/Wallis',
				'Pacific/Yap',
				'Poland',
				'Portugal',
				'PRC',
				'PST8PDT',
				'ROC',
				'ROK',
				'Singapore',
				'Turkey',
				'UCT',
				'Universal',
				'UTC',
				'WET',
				'W-SU',
				'Zulu'
			);
		}
	}
?>