Timezone in PHP

timezone.php

<?php 

return array (
    '(UTC-11:00) Midway Island' => 'Pacific/Midway',
    '(UTC-11:00) Samoa' => 'Pacific/Samoa',
    '(UTC-10:00) Hawaii' => 'Pacific/Honolulu',
    '(UTC-09:00) Alaska' => 'US/Alaska',
    '(UTC-08:00) Pacific Time (US &amp; Canada)' => 'America/Los_Angeles',
    '(UTC-08:00) Tijuana' => 'America/Tijuana',
    '(UTC-07:00) Arizona' => 'US/Arizona',
    '(UTC-07:00) Chihuahua' => 'America/Chihuahua',
    '(UTC-07:00) La Paz' => 'America/Chihuahua',
    '(UTC-07:00) Mazatlan' => 'America/Mazatlan',
    '(UTC-07:00) Mountain Time (US &amp; Canada)' => 'US/Mountain',
    '(UTC-06:00) Central America' => 'America/Managua',
    '(UTC-06:00) Central Time (US &amp; Canada)' => 'US/Central',
    '(UTC-06:00) Guadalajara' => 'America/Mexico_City',
    '(UTC-06:00) Mexico City' => 'America/Mexico_City',
    '(UTC-06:00) Monterrey' => 'America/Monterrey',
    '(UTC-06:00) Saskatchewan' => 'Canada/Saskatchewan',
    '(UTC-05:00) Bogota' => 'America/Bogota',
    '(UTC-05:00) Eastern Time (US &amp; Canada)' => 'US/Eastern',
    '(UTC-05:00) Indiana (East)' => 'US/East-Indiana',
    '(UTC-05:00) Lima' => 'America/Lima',
    '(UTC-05:00) Quito' => 'America/Bogota',
    '(UTC-04:00) Atlantic Time (Canada)' => 'Canada/Atlantic',
    '(UTC-04:30) Caracas' => 'America/Caracas',
    '(UTC-04:00) La Paz' => 'America/La_Paz',
    '(UTC-04:00) Santiago' => 'America/Santiago',
    '(UTC-03:30) Newfoundland' => 'Canada/Newfoundland',
    '(UTC-03:00) Brasilia' => 'America/Sao_Paulo',
    '(UTC-03:00) Buenos Aires' => 'America/Argentina/Buenos_Aires',
    '(UTC-03:00) Georgetown' => 'America/Argentina/Buenos_Aires',
    '(UTC-03:00) Greenland' => 'America/Godthab',
    '(UTC-02:00) Mid-Atlantic' => 'America/Noronha',
    '(UTC-01:00) Azores' => 'Atlantic/Azores',
    '(UTC-01:00) Cape Verde Is.' => 'Atlantic/Cape_Verde',
    '(UTC+00:00) Casablanca' => 'Africa/Casablanca',
    '(UTC+00:00) Edinburgh' => 'Europe/London',
    '(UTC+00:00) Greenwich Mean Time : Dublin' => 'Etc/Greenwich',
    '(UTC+00:00) Lisbon' => 'Europe/Lisbon',
    '(UTC+00:00) London' => 'Europe/London',
    '(UTC+00:00) Monrovia' => 'Africa/Monrovia',
    '(UTC+00:00) UTC' => 'UTC',
    '(UTC+01:00) Amsterdam' => 'Europe/Amsterdam',
    '(UTC+01:00) Belgrade' => 'Europe/Belgrade',
    '(UTC+01:00) Berlin' => 'Europe/Berlin',
    '(UTC+01:00) Bern' => 'Europe/Berlin',
    '(UTC+01:00) Bratislava' => 'Europe/Bratislava',
    '(UTC+01:00) Brussels' => 'Europe/Brussels',
    '(UTC+01:00) Budapest' => 'Europe/Budapest',
    '(UTC+01:00) Copenhagen' => 'Europe/Copenhagen',
    '(UTC+01:00) Ljubljana' => 'Europe/Ljubljana',
    '(UTC+01:00) Madrid' => 'Europe/Madrid',
    '(UTC+01:00) Paris' => 'Europe/Paris',
    '(UTC+01:00) Prague' => 'Europe/Prague',
    '(UTC+01:00) Rome' => 'Europe/Rome',
    '(UTC+01:00) Sarajevo' => 'Europe/Sarajevo',
    '(UTC+01:00) Skopje' => 'Europe/Skopje',
    '(UTC+01:00) Stockholm' => 'Europe/Stockholm',
    '(UTC+01:00) Vienna' => 'Europe/Vienna',
    '(UTC+01:00) Warsaw' => 'Europe/Warsaw',
    '(UTC+01:00) West Central Africa' => 'Africa/Lagos',
    '(UTC+01:00) Zagreb' => 'Europe/Zagreb',
    '(UTC+02:00) Athens' => 'Europe/Athens',
    '(UTC+02:00) Bucharest' => 'Europe/Bucharest',
    '(UTC+02:00) Cairo' => 'Africa/Cairo',
    '(UTC+02:00) Harare' => 'Africa/Harare',
    '(UTC+02:00) Helsinki' => 'Europe/Helsinki',
    '(UTC+02:00) Istanbul' => 'Europe/Istanbul',
    '(UTC+02:00) Jerusalem' => 'Asia/Jerusalem',
    '(UTC+02:00) Kyiv' => 'Europe/Helsinki',
    '(UTC+02:00) Pretoria' => 'Africa/Johannesburg',
    '(UTC+02:00) Riga' => 'Europe/Riga',
    '(UTC+02:00) Sofia' => 'Europe/Sofia',
    '(UTC+02:00) Tallinn' => 'Europe/Tallinn',
    '(UTC+02:00) Vilnius' => 'Europe/Vilnius',
    '(UTC+03:00) Baghdad' => 'Asia/Baghdad',
    '(UTC+03:00) Kuwait' => 'Asia/Kuwait',
    '(UTC+03:00) Minsk' => 'Europe/Minsk',
    '(UTC+03:00) Nairobi' => 'Africa/Nairobi',
    '(UTC+03:00) Riyadh' => 'Asia/Riyadh',
    '(UTC+03:00) Volgograd' => 'Europe/Volgograd',
    '(UTC+03:30) Tehran' => 'Asia/Tehran',
    '(UTC+04:00) Abu Dhabi' => 'Asia/Muscat',
    '(UTC+04:00) Baku' => 'Asia/Baku',
    '(UTC+04:00) Moscow' => 'Europe/Moscow',
    '(UTC+04:00) Muscat' => 'Asia/Muscat',
    '(UTC+04:00) St. Petersburg' => 'Europe/Moscow',
    '(UTC+04:00) Tbilisi' => 'Asia/Tbilisi',
    '(UTC+04:00) Yerevan' => 'Asia/Yerevan',
    '(UTC+04:30) Kabul' => 'Asia/Kabul',
    '(UTC+05:00) Islamabad' => 'Asia/Karachi',
    '(UTC+05:00) Karachi' => 'Asia/Karachi',
    '(UTC+05:00) Tashkent' => 'Asia/Tashkent',
    '(UTC+05:30) Chennai' => 'Asia/Calcutta',
    '(UTC+05:30) Kolkata' => 'Asia/Kolkata',
    '(UTC+05:30) Mumbai' => 'Asia/Calcutta',
    '(UTC+05:30) New Delhi' => 'Asia/Calcutta',
    '(UTC+05:30) Sri Jayawardenepura' => 'Asia/Calcutta',
    '(UTC+05:45) Kathmandu' => 'Asia/Katmandu',
    '(UTC+06:00) Almaty' => 'Asia/Almaty',
    '(UTC+06:00) Astana' => 'Asia/Dhaka',
    '(UTC+06:00) Dhaka' => 'Asia/Dhaka',
    '(UTC+06:00) Ekaterinburg' => 'Asia/Yekaterinburg',
    '(UTC+06:30) Rangoon' => 'Asia/Rangoon',
    '(UTC+07:00) Bangkok' => 'Asia/Bangkok',
    '(UTC+07:00) Hanoi' => 'Asia/Bangkok',
    '(UTC+07:00) Jakarta' => 'Asia/Jakarta',
    '(UTC+07:00) Novosibirsk' => 'Asia/Novosibirsk',
    '(UTC+08:00) Beijing' => 'Asia/Hong_Kong',
    '(UTC+08:00) Chongqing' => 'Asia/Chongqing',
    '(UTC+08:00) Hong Kong' => 'Asia/Hong_Kong',
    '(UTC+08:00) Krasnoyarsk' => 'Asia/Krasnoyarsk',
    '(UTC+08:00) Kuala Lumpur' => 'Asia/Kuala_Lumpur',
    '(UTC+08:00) Perth' => 'Australia/Perth',
    '(UTC+08:00) Singapore' => 'Asia/Singapore',
    '(UTC+08:00) Taipei' => 'Asia/Taipei',
    '(UTC+08:00) Ulaan Bataar' => 'Asia/Ulan_Bator',
    '(UTC+08:00) Urumqi' => 'Asia/Urumqi',
    '(UTC+09:00) Irkutsk' => 'Asia/Irkutsk',
    '(UTC+09:00) Osaka' => 'Asia/Tokyo',
    '(UTC+09:00) Sapporo' => 'Asia/Tokyo',
    '(UTC+09:00) Seoul' => 'Asia/Seoul',
    '(UTC+09:00) Tokyo' => 'Asia/Tokyo',
    '(UTC+09:30) Adelaide' => 'Australia/Adelaide',
    '(UTC+09:30) Darwin' => 'Australia/Darwin',
    '(UTC+10:00) Brisbane' => 'Australia/Brisbane',
    '(UTC+10:00) Canberra' => 'Australia/Canberra',
    '(UTC+10:00) Guam' => 'Pacific/Guam',
    '(UTC+10:00) Hobart' => 'Australia/Hobart',
    '(UTC+10:00) Melbourne' => 'Australia/Melbourne',
    '(UTC+10:00) Port Moresby' => 'Pacific/Port_Moresby',
    '(UTC+10:00) Sydney' => 'Australia/Sydney',
    '(UTC+10:00) Yakutsk' => 'Asia/Yakutsk',
    '(UTC+11:00) Vladivostok' => 'Asia/Vladivostok',
    '(UTC+12:00) Auckland' => 'Pacific/Auckland',
    '(UTC+12:00) Fiji' => 'Pacific/Fiji',
    '(UTC+12:00) International Date Line West' => 'Pacific/Kwajalein',
    '(UTC+12:00) Kamchatka' => 'Asia/Kamchatka',
    '(UTC+12:00) Magadan' => 'Asia/Magadan',
    '(UTC+12:00) Marshall Is.' => 'Pacific/Fiji',
    '(UTC+12:00) New Caledonia' => 'Asia/Magadan',
    '(UTC+12:00) Solomon Is.' => 'Asia/Magadan',
    '(UTC+12:00) Wellington' => 'Pacific/Auckland',
    '(UTC+13:00) Nuku\'alofa' => 'Pacific/Tongatapu'
);
?>

Thank you very much for this helpful array .

Thanks, It was very helpful

Please check '(UTC+05:45) Kathmandu' => 'Asia/Katmandu'.

On http://php.net/manual/en/timezones.asia.php it shows Asia/Kathmandu instead of Asia/Katmandu