<?php

/*

Copyright (c) 2006, Alex Tingle.  $Revision: 236 $

This program is free software; you can redistribute it and/or

modify it under the terms of the GNU General Public License

as published by the Free Software Foundation; either version 2

of the License, or (at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

*/

// Deal with timezones differently, depending upon what PHP has to offer.

if(function_exists('date_default_timezone_get')):

  // PHP5

  function ec3_tz_push($tz)

  {

    $old_tz=date_default_timezone_get();

    date_default_timezone_set($tz);

    return $old_tz;

  }

  function ec3_tz_pop($tz)

  {

    date_default_timezone_set($tz);

  }

elseif(ini_get('safe_mode')):

  // PHP4 safe mode.

  function ec3_tz_push($tz)

  {

    return $tz;

  }

  function ec3_tz_pop($tz)

  {

    // do nothing

  }

  $ec3->tz_disabled=true;

  $ec3->tz=getenv('TZ');

else:

  // PHP4 safe mode OFF 

  function ec3_tz_push($tz)

  {

    $old_tz=getenv('TZ');

    putenv("TZ=$tz");

    return $old_tz;

  }

  function ec3_tz_pop($tz)

  {

    putenv("TZ=$tz");

  }

endif;

/** Converts a WordPress timestamp to Unix time. */

function ec3_to_time($timestamp)

{

  global $ec3;

  // Parse $timestamp and extract the Unix time.

  $old_tz=ec3_tz_push($ec3->tz);

  $unix_time = strtotime($timestamp);

  ec3_tz_pop($old_tz);

  // Unix time is seconds since the epoch (in UTC).

  return $unix_time;

}

/** Converts a WordPress timestamp to UTC. */

function ec3_to_utc($timestamp,$fmt='%Y%m%dT%H%M00Z')

{

  $result = gmstrftime($fmt,ec3_to_time($timestamp));

  return $result;

}

/** Formats a Unix time as a time in the current timezone. */

function ec3_strftime($format,$unix_time=0)

{

  global $ec3;

  if(!$unix_time)

      $unix_time=time();

  // Express the Unix time as a string for timezone $ec3->tz.

  $old_tz=ec3_tz_push($ec3->tz);

  $result = strftime($format,$unix_time);

  ec3_tz_pop($old_tz);

  return $result;

}

$ec3->today=ec3_strftime("%Y-%m-%d 00:00:00");

/** Call from within a <select>. Echos grouped options for all timezones. */

function ec3_get_tz_options($selected='')

{

  /** All possible timezones, by group. */

  $groups = array(

    'Africa' => array(

      'Abidjan',

      'Accra',

      'Addis_Ababa',

      'Algiers',

      'Asmera',

      'Bamako',

      'Bangui',

      'Banjul',

      'Bissau',

      'Blantyre',

      'Brazzaville',

      'Bujumbura',

      'Cairo',

      'Casablanca',

      'Ceuta',

      'Conakry',

      'Dakar',

      'Dar_es_Salaam',

      'Djibouti',

      'Douala',

      'El_Aaiun',

      'Freetown',

      'Gaborone',

      'Harare',

      'Johannesburg',

      'Kampala',

      'Khartoum',

      'Kigali',

      'Kinshasa',

      'Lagos',

      'Libreville',

      'Lome',

      'Luanda',

      'Lubumbashi',

      'Lusaka',

      'Malabo',

      'Maputo',

      'Maseru',

      'Mbabane',

      'Mogadishu',

      'Monrovia',

      'Nairobi',

      'Ndjamena',

      'Niamey',

      'Nouakchott',

      'Ouagadougou',

      'Porto-Novo',

      'Sao_Tome',

      'Timbuktu',

      'Tripoli',

      'Tunis',

      'Windhoek'

    ),

    'America' => array(

      'Adak',

      'Anchorage',

      'Anguilla',

      'Antigua',

      'Araguaina',

      'Argentina/Buenos_Aires',

      'Argentina/Catamarca',

      'Argentina/ComodRivadavia',

      'Argentina/Cordoba',

      'Argentina/Jujuy',

      'Argentina/La_Rioja',

      'Argentina/Mendoza',

      'Argentina/Rio_Gallegos',

      'Argentina/San_Juan',

      'Argentina/Tucuman',

      'Argentina/Ushuaia',

      'Aruba',

      'Asuncion',

      'Atikokan',

      'Atka',

      'Bahia',

      'Barbados',

      'Belem',

      'Belize',

      'Blanc-Sablon',

      'Boa_Vista',

      'Bogota',

      'Boise',

      'Buenos_Aires',

      'Cambridge_Bay',

      'Campo_Grande',

      'Cancun',

      'Caracas',

      'Catamarca',

      'Cayenne',

      'Cayman',

      'Chicago',

      'Chihuahua',

      'Coral_Harbour',

      'Cordoba',

      'Costa_Rica',

      'Cuiaba',

      'Curacao',

      'Danmarkshavn',

      'Dawson',

      'Dawson_Creek',

      'Denver',

      'Detroit',

      'Dominica',

      'Edmonton',

      'Eirunepe',

      'El_Salvador',

      'Ensenada',

      'Fort_Wayne',

      'Fortaleza',

      'Glace_Bay',

      'Godthab',

      'Goose_Bay',

      'Grand_Turk',

      'Grenada',

      'Guadeloupe',

      'Guatemala',

      'Guayaquil',

      'Guyana',

      'Halifax',

      'Havana',

      'Hermosillo',

      'Indiana/Indianapolis',

      'Indiana/Knox',

      'Indiana/Marengo',

      'Indiana/Petersburg',

      'Indiana/Vevay',

      'Indiana/Vincennes',

      'Indianapolis',

      'Inuvik',

      'Iqaluit',

      'Jamaica',

      'Jujuy',

      'Juneau',

      'Kentucky/Louisville',

      'Kentucky/Monticello',

      'Knox_IN',

      'La_Paz',

      'Lima',

      'Los_Angeles',

      'Louisville',

      'Maceio',

      'Managua',

      'Manaus',

      'Martinique',

      'Mazatlan',

      'Mendoza',

      'Menominee',

      'Merida',

      'Mexico_City',

      'Miquelon',

      'Moncton',

      'Monterrey',

      'Montevideo',

      'Montreal',

      'Montserrat',

      'Nassau',

      'New_York',

      'Nipigon',

      'Nome',

      'Noronha',

      'North_Dakota/Center',

      'North_Dakota/New_Salem',

      'Panama',

      'Pangnirtung',

      'Paramaribo',

      'Phoenix',

      'Port-au-Prince',

      'Port_of_Spain',

      'Porto_Acre',

      'Porto_Velho',

      'Puerto_Rico',

      'Rainy_River',

      'Rankin_Inlet',

      'Recife',

      'Regina',

      'Rio_Branco',

      'Rosario',

      'Santiago',

      'Santo_Domingo',

      'Sao_Paulo',

      'Scoresbysund',

      'Shiprock',

      'St_Johns',

      'St_Kitts',

      'St_Lucia',

      'St_Thomas',

      'St_Vincent',

      'Swift_Current',

      'Tegucigalpa',

      'Thule',

      'Thunder_Bay',

      'Tijuana',

      'Toronto',

      'Tortola',

      'Vancouver',

      'Virgin',

      'Whitehorse',

      'Winnipeg',

      'Yakutat',

      'Yellowknife'

    ),

    'Antarctica' => array(

      'Casey',

      'Davis',

      'DumontDUrville',

      'Mawson',

      'McMurdo',

      'Palmer',

      'Rothera',

      'South_Pole',

      'Syowa',

      'Vostok'

    ),

    'Arctic' => array('Longyearbyen'),

    'Asia' => array(

      'Aden',

      'Almaty',

      'Amman',

      'Anadyr',

      'Aqtau',

      'Aqtobe',

      'Ashgabat',

      'Ashkhabad',

      'Baghdad',

      'Bahrain',

      'Baku',

      'Bangkok',

      'Beirut',

      'Bishkek',

      'Brunei',

      'Calcutta',

      'Choibalsan',

      'Chongqing',

      'Chungking',

      'Colombo',

      'Dacca',

      'Damascus',

      'Dhaka',

      'Dili',

      'Dubai',

      'Dushanbe',

      'Gaza',

      'Harbin',

      'Hong_Kong',

      'Hovd',

      'Irkutsk',

      'Istanbul',

      'Jakarta',

      'Jayapura',

      'Jerusalem',

      'Kabul',

      'Kamchatka',

      'Karachi',

      'Kashgar',

      'Katmandu',

      'Krasnoyarsk',

      'Kuala_Lumpur',

      'Kuching',

      'Kuwait',

      'Macao',

      'Macau',

      'Magadan',

      'Makassar',

      'Manila',

      'Muscat',

      'Nicosia',

      'Novosibirsk',

      'Omsk',

      'Oral',

      'Phnom_Penh',

      'Pontianak',

      'Pyongyang',

      'Qatar',

      'Qyzylorda',

      'Rangoon',

      'Riyadh',

      'Saigon',

      'Sakhalin',

      'Samarkand',

      'Seoul',

      'Shanghai',

      'Singapore',

      'Taipei',

      'Tashkent',

      'Tbilisi',

      'Tehran',

      'Tel_Aviv',

      'Thimbu',

      'Thimphu',

      'Tokyo',

      'Ujung_Pandang',

      'Ulaanbaatar',

      'Ulan_Bator',

      'Urumqi',

      'Vientiane',

      'Vladivostok',

      'Yakutsk',

      'Yekaterinburg',

      'Yerevan'

    ),

    'Atlantic' => array(

      'Azores',

      'Bermuda',

      'Canary',

      'Cape_Verde',

      'Faeroe',

      'Jan_Mayen',

      'Madeira',

      'Reykjavik',

      'South_Georgia',

      'St_Helena',

      'Stanley',

    ),

    'Australia' => array(

      'ACT',

      'Adelaide',

      'Brisbane',

      'Broken_Hill',

      'Canberra',

      'Currie',

      'Darwin',

      'Hobart',

      'LHI',

      'Lindeman',

      'Lord_Howe',

      'Melbourne',

      'North',

      'NSW',

      'Perth',

      'Queensland',

      'South',

      'Sydney',

      'Tasmania',

      'Victoria',

      'West',

      'Yancowinna'

    ),

    'Europe' => array(

      'Amsterdam',

      'Andorra',

      'Athens',

      'Belfast',

      'Belgrade',

      'Berlin',

      'Bratislava',

      'Brussels',

      'Bucharest',

      'Budapest',

      'Chisinau',

      'Copenhagen',

      'Dublin',

      'Gibraltar',

      'Guernsey',

      'Helsinki',

      'Isle_of_Man',

      'Istanbul',