Laravel Timezone

Date/time timezone storage and retrieval for Laravel 5

A simple set of functions to assist in converting date/times between a global storage timezone, and a user's local timezone.

Requirements

• This has been unit tested on Laravel 5.4 with PHP 7.1, but I believe it should work with older versions as well. Let me know if you find that it does!

Installation

Install via Composer...

composer require gazugafan/laravel-timezone

Add the service provider to the providers array in config/app.php...

'providers' => [
	...
	\Gazugafan\Timezone\TimezoneServiceProvider::class
];

And add an alias to the aliases array in config/app.php...

'aliases' => [
	...
	'Timezone' => Gazugafan\Timezone\Facades\Timezone::class
];

Overview

If your application is timezone-aware, you'll want to be converting all of your date/times to a single global timezone before storing them in the database. Then, when you retrieve these date/times, you'll want to convert them to the currently-logged-in user's local timezone before displaying them. This Timezone class contains a simple set of methods for doing just that!

Setup

First, you need to decide what global timezone you'll be using to store your date/times in. Most people recommend using UTC for this storage timezone, which is fair because it's commonly-used and somewhat expected. It really doesn't matter, though--so long as you pick one timezone and never change it. Personally, I recommend using whatever timezone you (or your DBA) is in. This way, when manually querying or browsing the database, you'll be seeing dates in your own timezone instead of UTC, which will probably be much easier to work with.

Got your storage timezone figured out? Good! Fill it into the timezone entry in config/app.php. It's the only place you'll need to specify it...

'timezone' => 'America/Chicago',

Next, you'll need to figure out how your user's timezone will be specified. A pretty straightforward way to do this would be adding a timezone field to your user's table. By default, these helper methods will assume that's what you've done, and will retrieve the currently-logged-in user's timezone like this...

Auth::user()->timezone

If you need help coming up with a list of timezones for your users to select from, here's a set of options you could use in a dropdown...

<option value="America/New_York">America, Eastern</option>
<option value="America/Chicago">America, Central</option>
<option value="America/Denver">America, Mountain</option>
<option value="America/Phoenix">America, Mountain (no DST)</option>
<option value="America/Los_Angeles">America, Pacific</option>
<option value="America/Anchorage">America, Alaska</option>
<option value="America/Adak">America, Hawaii</option>
<option value="Pacific/Honolulu">Pacific, Hawaii (no DST)</option>
<option value="Pacific/Midway">Pacific, Midway (GMT-11:00)</option>
<option value="Pacific/Niue">Pacific, Niue (GMT-11:00)</option>
<option value="Pacific/Pago_Pago">Pacific, Pago Pago (GMT-11:00)</option>
<option value="Pacific/Honolulu">Pacific, Honolulu (GMT-10:00)</option>
<option value="Pacific/Johnston">Pacific, Johnston (GMT-10:00)</option>
<option value="Pacific/Rarotonga">Pacific, Rarotonga (GMT-10:00)</option>
<option value="Pacific/Tahiti">Pacific, Tahiti (GMT-10:00)</option>
<option value="Pacific/Marquesas">Pacific, Marquesas (GMT-09:30)</option>
<option value="America/Adak">America, Adak (GMT-09:00)</option>
<option value="Pacific/Gambier">Pacific, Gambier (GMT-09:00)</option>
<option value="America/Anchorage">America, Anchorage (GMT-08:00)</option>
<option value="America/Juneau">America, Juneau (GMT-08:00)</option>
<option value="America/Metlakatla">America, Metlakatla (GMT-08:00)</option>
<option value="America/Nome">America, Nome (GMT-08:00)</option>
<option value="America/Sitka">America, Sitka (GMT-08:00)</option>
<option value="America/Yakutat">America, Yakutat (GMT-08:00)</option>
<option value="Pacific/Pitcairn">Pacific, Pitcairn (GMT-08:00)</option>
<option value="America/Creston">America, Creston (GMT-07:00)</option>
<option value="America/Dawson">America, Dawson (GMT-07:00)</option>
<option value="America/Dawson_Creek">America, Dawson Creek (GMT-07:00)</option>
<option value="America/Fort_Nelson">America, Fort Nelson (GMT-07:00)</option>
<option value="America/Hermosillo">America, Hermosillo (GMT-07:00)</option>
<option value="America/Los_Angeles">America, Los Angeles (GMT-07:00)</option>
<option value="America/Phoenix">America, Phoenix (GMT-07:00)</option>
<option value="America/Tijuana">America, Tijuana (GMT-07:00)</option>
<option value="America/Vancouver">America, Vancouver (GMT-07:00)</option>
<option value="America/Whitehorse">America, Whitehorse (GMT-07:00)</option>
<option value="America/Belize">America, Belize (GMT-06:00)</option>
<option value="America/Boise">America, Boise (GMT-06:00)</option>
<option value="America/Cambridge_Bay">America, Cambridge Bay (GMT-06:00)</option>
<option value="America/Chihuahua">America, Chihuahua (GMT-06:00)</option>
<option value="America/Costa_Rica">America, Costa Rica (GMT-06:00)</option>
<option value="America/Denver">America, Denver (GMT-06:00)</option>
<option value="America/Edmonton">America, Edmonton (GMT-06:00)</option>
<option value="America/El_Salvador">America, El Salvador (GMT-06:00)</option>
<option value="America/Guatemala">America, Guatemala (GMT-06:00)</option>
<option value="America/Inuvik">America, Inuvik (GMT-06:00)</option>
<option value="America/Managua">America, Managua (GMT-06:00)</option>
<option value="America/Mazatlan">America, Mazatlan (GMT-06:00)</option>
<option value="America/Ojinaga">America, Ojinaga (GMT-06:00)</option>
<option value="America/Regina">America, Regina (GMT-06:00)</option>
<option value="America/Swift_Current">America, Swift Current (GMT-06:00)</option>
<option value="America/Tegucigalpa">America, Tegucigalpa (GMT-06:00)</option>
<option value="America/Yellowknife">America, Yellowknife (GMT-06:00)</option>
<option value="Pacific/Galapagos">Pacific, Galapagos (GMT-06:00)</option>
<option value="America/Atikokan">America, Atikokan (GMT-05:00)</option>
<option value="America/Bahia_Banderas">America, Bahia Banderas (GMT-05:00)</option>
<option value="America/Bogota">America, Bogota (GMT-05:00)</option>
<option value="America/Cancun">America, Cancun (GMT-05:00)</option>
<option value="America/Cayman">America, Cayman (GMT-05:00)</option>
<option value="America/Chicago">America, Chicago (GMT-05:00)</option>
<option value="America/Eirunepe">America, Eirunepe (GMT-05:00)</option>
<option value="America/Guayaquil">America, Guayaquil (GMT-05:00)</option>
<option value="America/Indiana/Knox">America, Indiana, Knox (GMT-05:00)</option>
<option value="America/Indiana/Tell_City">America, Indiana, Tell City (GMT-05:00)</option>
<option value="America/Jamaica">America, Jamaica (GMT-05:00)</option>
<option value="America/Lima">America, Lima (GMT-05:00)</option>
<option value="America/Matamoros">America, Matamoros (GMT-05:00)</option>
<option value="America/Menominee">America, Menominee (GMT-05:00)</option>
<option value="America/Merida">America, Merida (GMT-05:00)</option>
<option value="America/Mexico_City">America, Mexico City (GMT-05:00)</option>
<option value="America/Monterrey">America, Monterrey (GMT-05:00)</option>
<option value="America/North_Dakota/Beulah">America, North Dakota, Beulah (GMT-05:00)</option>
<option value="America/North_Dakota/Center">America, North Dakota, Center (GMT-05:00)</option>
<option value="America/North_Dakota/New_Salem">America, North Dakota, New Salem (GMT-05:00)</option>
<option value="America/Panama">America, Panama (GMT-05:00)</option>
<option value="America/Port-au-Prince">America, Port-au-Prince (GMT-05:00)</option>
<option value="America/Rainy_River">America, Rainy River (GMT-05:00)</option>
<option value="America/Rankin_Inlet">America, Rankin Inlet (GMT-05:00)</option>
<option value="America/Resolute">America, Resolute (GMT-05:00)</option>
<option value="America/Rio_Branco">America, Rio Branco (GMT-05:00)</option>
<option value="America/Winnipeg">America, Winnipeg (GMT-05:00)</option>
<option value="Pacific/Easter">Pacific, Easter (GMT-05:00)</option>
<option value="America/Anguilla">America, Anguilla (GMT-04:00)</option>
<option value="America/Antigua">America, Antigua (GMT-04:00)</option>
<option value="America/Aruba">America, Aruba (GMT-04:00)</option>
<option value="America/Asuncion">America, Asuncion (GMT-04:00)</option>
<option value="America/Barbados">America, Barbados (GMT-04:00)</option>
<option value="America/Blanc-Sablon">America, Blanc-Sablon (GMT-04:00)</option>
<option value="America/Boa_Vista">America, Boa Vista (GMT-04:00)</option>
<option value="America/Campo_Grande">America, Campo Grande (GMT-04:00)</option>
<option value="America/Caracas">America, Caracas (GMT-04:00)</option>
<option value="America/Cuiaba">America, Cuiaba (GMT-04:00)</option>
<option value="America/Curacao">America, Curacao (GMT-04:00)</option>
<option value="America/Detroit">America, Detroit (GMT-04:00)</option>
<option value="America/Dominica">America, Dominica (GMT-04:00)</option>
<option value="America/Grand_Turk">America, Grand Turk (GMT-04:00)</option>
<option value="America/Grenada">America, Grenada (GMT-04:00)</option>
<option value="America/Guadeloupe">America, Guadeloupe (GMT-04:00)</option>
<option value="America/Guyana">America, Guyana (GMT-04:00)</option>
<option value="America/Havana">America, Havana (GMT-04:00)</option>
<option value="America/Indiana/Indianapolis">America, Indiana, Indianapolis (GMT-04:00)</option>
<option value="America/Indiana/Marengo">America, Indiana, Marengo (GMT-04:00)</option>
<option value="America/Indiana/Petersburg">America, Indiana, Petersburg (GMT-04:00)</option>
<option value="America/Indiana/Vevay">America, Indiana, Vevay (GMT-04:00)</option>
<option value="America/Indiana/Vincennes">America, Indiana, Vincennes (GMT-04:00)</option>
<option value="America/Indiana/Winamac">America, Indiana, Winamac (GMT-04:00)</option>
<option value="America/Iqaluit">America, Iqaluit (GMT-04:00)</option>
<option value="America/Kentucky/Louisville">America, Kentucky, Louisville (GMT-04:00)</option>
<option value="America/Kentucky/Monticello">America, Kentucky, Monticello (GMT-04:00)</option>
<option value="America/Kralendijk">America, Kralendijk (GMT-04:00)</option>
<option value="America/La_Paz">America, La Paz (GMT-04:00)</option>
<option value="America/Lower_Princes">America, Lower Princes (GMT-04:00)</option>
<option value="America/Manaus">America, Manaus (GMT-04:00)</option>
<option value="America/Marigot">America, Marigot (GMT-04:00)</option>
<option value="America/Martinique">America, Martinique (GMT-04:00)</option>
<option value="America/Montserrat">America, Montserrat (GMT-04:00)</option>
<option value="America/Nassau">America, Nassau (GMT-04:00)</option>
<option value="America/New_York">America, New York (GMT-04:00)</option>
<option value="America/Nipigon">America, Nipigon (GMT-04:00)</option>
<option value="America/Pangnirtung">America, Pangnirtung (GMT-04:00)</option>
<option value="America/Port_of_Spain">America, Port of Spain (GMT-04:00)</option>
<option value="America/Porto_Velho">America, Porto Velho (GMT-04:00)</option>
<option value="America/Puerto_Rico">America, Puerto Rico (GMT-04:00)</option>
<option value="America/Santo_Domingo">America, Santo Domingo (GMT-04:00)</option>
<option value="America/St_Barthelemy">America, St. Barthelemy (GMT-04:00)</option>
<option value="America/St_Kitts">America, St. Kitts (GMT-04:00)</option>
<option value="America/St_Lucia">America, St. Lucia (GMT-04:00)</option>
<option value="America/St_Thomas">America, St. Thomas (GMT-04:00)</option>
<option value="America/St_Vincent">America, St. Vincent (GMT-04:00)</option>
<option value="America/Thunder_Bay">America, Thunder Bay (GMT-04:00)</option>
<option value="America/Toronto">America, Toronto (GMT-04:00)</option>
<option value="America/Tortola">America, Tortola (GMT-04:00)</option>
<option value="America/Araguaina">America, Araguaina (GMT-03:00)</option>
<option value="America/Argentina/Buenos_Aires">America, Argentina, Buenos Aires (GMT-03:00)</option>
<option value="America/Argentina/Catamarca">America, Argentina, Catamarca (GMT-03:00)</option>
<option value="America/Argentina/Cordoba">America, Argentina, Cordoba (GMT-03:00)</option>
<option value="America/Argentina/Jujuy">America, Argentina, Jujuy (GMT-03:00)</option>
<option value="America/Argentina/La_Rioja">America, Argentina, La Rioja (GMT-03:00)</option>
<option value="America/Argentina/Mendoza">America, Argentina, Mendoza (GMT-03:00)</option>
<option value="America/Argentina/Rio_Gallegos">America, Argentina, Rio Gallegos (GMT-03:00)</option>
<option value="America/Argentina/Salta">America, Argentina, Salta (GMT-03:00)</option>
<option value="America/Argentina/San_Juan">America, Argentina, San Juan (GMT-03:00)</option>
<option value="America/Argentina/San_Luis">America, Argentina, San Luis (GMT-03:00)</option>
<option value="America/Argentina/Tucuman">America, Argentina, Tucuman (GMT-03:00)</option>
<option value="America/Argentina/Ushuaia">America, Argentina, Ushuaia (GMT-03:00)</option>
<option value="America/Bahia">America, Bahia (GMT-03:00)</option>
<option value="America/Belem">America, Belem (GMT-03:00)</option>
<option value="America/Cayenne">America, Cayenne (GMT-03:00)</option>
<option value="America/Fortaleza">America, Fortaleza (GMT-03:00)</option>
<option value="America/Glace_Bay">America, Glace Bay (GMT-03:00)</option>
<option value="America/Goose_Bay">America, Goose Bay (GMT-03:00)</option>
<option value="America/Halifax">America, Halifax (GMT-03:00)</option>
<option value="America/Maceio">America, Maceio (GMT-03:00)</option>
<option value="America/Moncton">America, Moncton (GMT-03:00)</option>
<option value="America/Montevideo">America, Montevideo (GMT-03:00)</option>
<option value="America/Paramaribo">America, Paramaribo (GMT-03:00)</option>
<option value="America/Recife">America, Recife (GMT-03:00)</option>
<option value="America/Santarem">America, Santarem (GMT-03:00)</option>
<option value="America/Santiago">America, Santiago (GMT-03:00)</option>
<option value="America/Sao_Paulo">America, Sao Paulo (GMT-03:00)</option>
<option value="America/Thule">America, Thule (GMT-03:00)</option>
<option value="Antarctica/Palmer">Antarctica, Palmer (GMT-03:00)</option>
<option value="Antarctica/Rothera">Antarctica, Rothera (GMT-03:00)</option>
<option value="Atlantic/Bermuda">Atlantic, Bermuda (GMT-03:00)</option>
<option value="Atlantic/Stanley">Atlantic, Stanley (GMT-03:00)</option>
<option value="America/St_Johns">America, St. Johns (GMT-02:30)</option>
<option value="America/Godthab">America, Godthab (GMT-02:00)</option>
<option value="America/Miquelon">America, Miquelon (GMT-02:00)</option>
<option value="America/Noronha">America, Noronha (GMT-02:00)</option>
<option value="Atlantic/South_Georgia">Atlantic, South Georgia (GMT-02:00)</option>
<option value="Atlantic/Cape_Verde">Atlantic, Cape Verde (GMT-01:00)</option>
<option value="Africa/Abidjan">Africa, Abidjan (GMT)</option>
<option value="Africa/Accra">Africa, Accra (GMT)</option>
<option value="Africa/Bamako">Africa, Bamako (GMT)</option>
<option value="Africa/Banjul">Africa, Banjul (GMT)</option>
<option value="Africa/Bissau">Africa, Bissau (GMT)</option>
<option value="Africa/Conakry">Africa, Conakry (GMT)</option>
<option value="Africa/Dakar">Africa, Dakar (GMT)</option>
<option value="Africa/Freetown">Africa, Freetown (GMT)</option>
<option value="Africa/Lome">Africa, Lome (GMT)</option>
<option value="Africa/Monrovia">Africa, Monrovia (GMT)</option>
<option value="Africa/Nouakchott">Africa, Nouakchott (GMT)</option>
<option value="Africa/Ouagadougou">Africa, Ouagadougou (GMT)</option>
<option value="Africa/Sao_Tome">Africa, Sao Tome (GMT)</option>
<option value="America/Danmarkshavn">America, Danmarkshavn (GMT)</option>
<option value="America/Scoresbysund">America, Scoresbysund (GMT)</option>
<option value="Atlantic/Azores">Atlantic, Azores (GMT)</option>
<option value="Atlantic/Reykjavik">Atlantic, Reykjavik (GMT)</option>
<option value="Atlantic/St_Helena">Atlantic, St. Helena (GMT)</option>
<option value="UTC">UTC (GMT)</option>
<option value="Africa/Algiers">Africa, Algiers (GMT+01:00)</option>
<option value="Africa/Bangui">Africa, Bangui (GMT+01:00)</option>
<option value="Africa/Brazzaville">Africa, Brazzaville (GMT+01:00)</option>
<option value="Africa/Casablanca">Africa, Casablanca (GMT+01:00)</option>
<option value="Africa/Douala">Africa, Douala (GMT+01:00)</option>
<option value="Africa/El_Aaiun">Africa, El Aaiun (GMT+01:00)</option>
<option value="Africa/Kinshasa">Africa, Kinshasa (GMT+01:00)</option>
<option value="Africa/Lagos">Africa, Lagos (GMT+01:00)</option>
<option value="Africa/Libreville">Africa, Libreville (GMT+01:00)</option>
<option value="Africa/Luanda">Africa, Luanda (GMT+01:00)</option>
<option value="Africa/Malabo">Africa, Malabo (GMT+01:00)</option>
<option value="Africa/Ndjamena">Africa, Ndjamena (GMT+01:00)</option>
<option value="Africa/Niamey">Africa, Niamey (GMT+01:00)</option>
<option value="Africa/Porto-Novo">Africa, Porto-Novo (GMT+01:00)</option>
<option value="Africa/Tunis">Africa, Tunis (GMT+01:00)</option>
<option value="Africa/Windhoek">Africa, Windhoek (GMT+01:00)</option>
<option value="Atlantic/Canary">Atlantic, Canary (GMT+01:00)</option>
<option value="Atlantic/Faroe">Atlantic, Faroe (GMT+01:00)</option>
<option value="Atlantic/Madeira">Atlantic, Madeira (GMT+01:00)</option>
<option value="Europe/Dublin">Europe, Dublin (GMT+01:00)</option>
<option value="Europe/Guernsey">Europe, Guernsey (GMT+01:00)</option>
<option value="Europe/Isle_of_Man">Europe, Isle of Man (GMT+01:00)</option>
<option value="Europe/Jersey">Europe, Jersey (GMT+01:00)</option>
<option value="Europe/Lisbon">Europe, Lisbon (GMT+01:00)</option>
<option value="Europe/London">Europe, London (GMT+01:00)</option>
<option value="Africa/Blantyre">Africa, Blantyre (GMT+02:00)</option>
<option value="Africa/Bujumbura">Africa, Bujumbura (GMT+02:00)</option>
<option value="Africa/Cairo">Africa, Cairo (GMT+02:00)</option>
<option value="Africa/Ceuta">Africa, Ceuta (GMT+02:00)</option>
<option value="Africa/Gaborone">Africa, Gaborone (GMT+02:00)</option>
<option value="Africa/Harare">Africa, Harare (GMT+02:00)</option>
<option value="Africa/Johannesburg">Africa, Johannesburg (GMT+02:00)</option>
<option value="Africa/Kigali">Africa, Kigali (GMT+02:00)</option>
<option value="Africa/Lubumbashi">Africa, Lubumbashi (GMT+02:00)</option>
<option value="Africa/Lusaka">Africa, Lusaka (GMT+02:00)</option>
<option value="Africa/Maputo">Africa, Maputo (GMT+02:00)</option>
<option value="Africa/Maseru">Africa, Maseru (GMT+02:00)</option>
<option value="Africa/Mbabane">Africa, Mbabane (GMT+02:00)</option>
<option value="Africa/Tripoli">Africa, Tripoli (GMT+02:00)</option>
<option value="Antarctica/Troll">Antarctica, Troll (GMT+02:00)</option>
<option value="Arctic/Longyearbyen">Arctic, Longyearbyen (GMT+02:00)</option>
<option value="Europe/Amsterdam">Europe, Amsterdam (GMT+02:00)</option>
<option value="Europe/Andorra">Europe, Andorra (GMT+02:00)</option>
<option value="Europe/Belgrade">Europe, Belgrade (GMT+02:00)</option>
<option value="Europe/Berlin">Europe, Berlin (GMT+02:00)</option>
<option value="Europe/Bratislava">Europe, Bratislava (GMT+02:00)</option>
<option value="Europe/Brussels">Europe, Brussels (GMT+02:00)</option>
<option value="Europe/Budapest">Europe, Budapest (GMT+02:00)</option>
<option value="Europe/Busingen">Europe, Busingen (GMT+02:00)</option>
<option value="Europe/Copenhagen">Europe, Copenhagen (GMT+02:00)</option>
<option value="Europe/Gibraltar">Europe, Gibraltar (GMT+02:00)</option>
<option value="Europe/Kaliningrad">Europe, Kaliningrad (GMT+02:00)</option>
<option value="Europe/Ljubljana">Europe, Ljubljana (GMT+02:00)</option>
<option value="Europe/Luxembourg">Europe, Luxembourg (GMT+02:00)</option>
<option value="Europe/Madrid">Europe, Madrid (GMT+02:00)</option>
<option value="Europe/Malta">Europe, Malta (GMT+02:00)</option>
<option value="Europe/Monaco">Europe, Monaco (GMT+02:00)</option>
<option value="Europe/Oslo">Europe, Oslo (GMT+02:00)</option>
<option value="Europe/Paris">Europe, Paris (GMT+02:00)</option>
<option value="Europe/Podgorica">Europe, Podgorica (GMT+02:00)</option>
<option value="Europe/Prague">Europe, Prague (GMT+02:00)</option>
<option value="Europe/Rome">Europe, Rome (GMT+02:00)</option>
<option value="Europe/San_Marino">Europe, San Marino (GMT+02:00)</option>
<option value="Europe/Sarajevo">Europe, Sarajevo (GMT+02:00)</option>
<option value="Europe/Skopje">Europe, Skopje (GMT+02:00)</option>
<option value="Europe/Stockholm">Europe, Stockholm (GMT+02:00)</option>
<option value="Europe/Tirane">Europe, Tirane (GMT+02:00)</option>
<option value="Europe/Vaduz">Europe, Vaduz (GMT+02:00)</option>
<option value="Europe/Vatican">Europe, Vatican (GMT+02:00)</option>
<option value="Europe/Vienna">Europe, Vienna (GMT+02:00)</option>
<option value="Europe/Warsaw">Europe, Warsaw (GMT+02:00)</option>
<option value="Europe/Zagreb">Europe, Zagreb (GMT+02:00)</option>
<option value="Europe/Zurich">Europe, Zurich (GMT+02:00)</option>
<option value="Africa/Addis_Ababa">Africa, Addis Ababa (GMT+03:00)</option>
<option value="Africa/Asmara">Africa, Asmara (GMT+03:00)</option>
<option value="Africa/Dar_es_Salaam">Africa, Dar es Salaam (GMT+03:00)</option>
<option value="Africa/Djibouti">Africa, Djibouti (GMT+03:00)</option>
<option value="Africa/Juba">Africa, Juba (GMT+03:00)</option>
<option value="Africa/Kampala">Africa, Kampala (GMT+03:00)</option>
<option value="Africa/Khartoum">Africa, Khartoum (GMT+03:00)</option>
<option value="Africa/Mogadishu">Africa, Mogadishu (GMT+03:00)</option>
<option value="Africa/Nairobi">Africa, Nairobi (GMT+03:00)</option>
<option value="Antarctica/Syowa">Antarctica, Syowa (GMT+03:00)</option>
<option value="Asia/Aden">Asia, Aden (GMT+03:00)</option>
<option value="Asia/Amman">Asia, Amman (GMT+03:00)</option>
<option value="Asia/Baghdad">Asia, Baghdad (GMT+03:00)</option>
<option value="Asia/Bahrain">Asia, Bahrain (GMT+03:00)</option>
<option value="Asia/Beirut">Asia, Beirut (GMT+03:00)</option>
<option value="Asia/Damascus">Asia, Damascus (GMT+03:00)</option>
<option value="Asia/Famagusta">Asia, Famagusta (GMT+03:00)</option>
<option value="Asia/Gaza">Asia, Gaza (GMT+03:00)</option>
<option value="Asia/Hebron">Asia, Hebron (GMT+03:00)</option>
<option value="Asia/Jerusalem">Asia, Jerusalem (GMT+03:00)</option>
<option value="Asia/Kuwait">Asia, Kuwait (GMT+03:00)</option>
<option value="Asia/Nicosia">Asia, Nicosia (GMT+03:00)</option>
<option value="Asia/Qatar">Asia, Qatar (GMT+03:00)</option>
<option value="Asia/Riyadh">Asia, Riyadh (GMT+03:00)</option>
<option value="Europe/Athens">Europe, Athens (GMT+03:00)</option>
<option value="Europe/Bucharest">Europe, Bucharest (GMT+03:00)</option>
<option value="Europe/Chisinau">Europe, Chisinau (GMT+03:00)</option>
<option value="Europe/Helsinki">Europe, Helsinki (GMT+03:00)</option>
<option value="Europe/Istanbul">Europe, Istanbul (GMT+03:00)</option>
<option value="Europe/Kiev">Europe, Kiev (GMT+03:00)</option>
<option value="Europe/Kirov">Europe, Kirov (GMT+03:00)</option>
<option value="Europe/Mariehamn">Europe, Mariehamn (GMT+03:00)</option>
<option value="Europe/Minsk">Europe, Minsk (GMT+03:00)</option>
<option value="Europe/Moscow">Europe, Moscow (GMT+03:00)</option>
<option value="Europe/Riga">Europe, Riga (GMT+03:00)</option>
<option value="Europe/Simferopol">Europe, Simferopol (GMT+03:00)</option>
<option value="Europe/Sofia">Europe, Sofia (GMT+03:00)</option>
<option value="Europe/Tallinn">Europe, Tallinn (GMT+03:00)</option>
<option value="Europe/Uzhgorod">Europe, Uzhgorod (GMT+03:00)</option>
<option value="Europe/Vilnius">Europe, Vilnius (GMT+03:00)</option>
<option value="Europe/Volgograd">Europe, Volgograd (GMT+03:00)</option>
<option value="Europe/Zaporozhye">Europe, Zaporozhye (GMT+03:00)</option>
<option value="Indian/Antananarivo">Indian, Antananarivo (GMT+03:00)</option>
<option value="Indian/Comoro">Indian, Comoro (GMT+03:00)</option>
<option value="Indian/Mayotte">Indian, Mayotte (GMT+03:00)</option>
<option value="Asia/Baku">Asia, Baku (GMT+04:00)</option>
<option value="Asia/Dubai">Asia, Dubai (GMT+04:00)</option>
<option value="Asia/Muscat">Asia, Muscat (GMT+04:00)</option>
<option value="Asia/Tbilisi">Asia, Tbilisi (GMT+04:00)</option>
<option value="Asia/Yerevan">Asia, Yerevan (GMT+04:00)</option>
<option value="Europe/Astrakhan">Europe, Astrakhan (GMT+04:00)</option>
<option value="Europe/Samara">Europe, Samara (GMT+04:00)</option>
<option value="Europe/Saratov">Europe, Saratov (GMT+04:00)</option>
<option value="Europe/Ulyanovsk">Europe, Ulyanovsk (GMT+04:00)</option>
<option value="Indian/Mahe">Indian, Mahe (GMT+04:00)</option>
<option value="Indian/Mauritius">Indian, Mauritius (GMT+04:00)</option>
<option value="Indian/Reunion">Indian, Reunion (GMT+04:00)</option>
<option value="Asia/Kabul">Asia, Kabul (GMT+04:30)</option>
<option value="Asia/Tehran">Asia, Tehran (GMT+04:30)</option>
<option value="Antarctica/Mawson">Antarctica, Mawson (GMT+05:00)</option>
<option value="Asia/Aqtau">Asia, Aqtau (GMT+05:00)</option>
<option value="Asia/Aqtobe">Asia, Aqtobe (GMT+05:00)</option>
<option value="Asia/Ashgabat">Asia, Ashgabat (GMT+05:00)</option>
<option value="Asia/Atyrau">Asia, Atyrau (GMT+05:00)</option>
<option value="Asia/Dushanbe">Asia, Dushanbe (GMT+05:00)</option>
<option value="Asia/Karachi">Asia, Karachi (GMT+05:00)</option>
<option value="Asia/Oral">Asia, Oral (GMT+05:00)</option>
<option value="Asia/Samarkand">Asia, Samarkand (GMT+05:00)</option>
<option value="Asia/Tashkent">Asia, Tashkent (GMT+05:00)</option>
<option value="Asia/Yekaterinburg">Asia, Yekaterinburg (GMT+05:00)</option>
<option value="Indian/Kerguelen">Indian, Kerguelen (GMT+05:00)</option>
<option value="Indian/Maldives">Indian, Maldives (GMT+05:00)</option>
<option value="Asia/Colombo">Asia, Colombo (GMT+05:30)</option>
<option value="Asia/Kolkata">Asia, Kolkata (GMT+05:30)</option>
<option value="Asia/Kathmandu">Asia, Kathmandu (GMT+05:45)</option>
<option value="Antarctica/Vostok">Antarctica, Vostok (GMT+06:00)</option>
<option value="Asia/Almaty">Asia, Almaty (GMT+06:00)</option>
<option value="Asia/Bishkek">Asia, Bishkek (GMT+06:00)</option>
<option value="Asia/Dhaka">Asia, Dhaka (GMT+06:00)</option>
<option value="Asia/Omsk">Asia, Omsk (GMT+06:00)</option>
<option value="Asia/Qyzylorda">Asia, Qyzylorda (GMT+06:00)</option>
<option value="Asia/Thimphu">Asia, Thimphu (GMT+06:00)</option>
<option value="Asia/Urumqi">Asia, Urumqi (GMT+06:00)</option>
<option value="Indian/Chagos">Indian, Chagos (GMT+06:00)</option>
<option value="Asia/Yangon">Asia, Yangon (GMT+06:30)</option>
<option value="Indian/Cocos">Indian, Cocos (GMT+06:30)</option>
<option value="Antarctica/Davis">Antarctica, Davis (GMT+07:00)</option>
<option value="Asia/Bangkok">Asia, Bangkok (GMT+07:00)</option>
<option value="Asia/Barnaul">Asia, Barnaul (GMT+07:00)</option>
<option value="Asia/Ho_Chi_Minh">Asia, Ho Chi Minh (GMT+07:00)</option>
<option value="Asia/Jakarta">Asia, Jakarta (GMT+07:00)</option>
<option value="Asia/Krasnoyarsk">Asia, Krasnoyarsk (GMT+07:00)</option>
<option value="Asia/Novokuznetsk">Asia, Novokuznetsk (GMT+07:00)</option>
<option value="Asia/Novosibirsk">Asia, Novosibirsk (GMT+07:00)</option>
<option value="Asia/Phnom_Penh">Asia, Phnom Penh (GMT+07:00)</option>
<option value="Asia/Pontianak">Asia, Pontianak (GMT+07:00)</option>
<option value="Asia/Tomsk">Asia, Tomsk (GMT+07:00)</option>
<option value="Asia/Vientiane">Asia, Vientiane (GMT+07:00)</option>
<option value="Indian/Christmas">Indian, Christmas (GMT+07:00)</option>
<option value="Asia/Brunei">Asia, Brunei (GMT+08:00)</option>
<option value="Asia/Hong_Kong">Asia, Hong Kong (GMT+08:00)</option>
<option value="Asia/Hovd">Asia, Hovd (GMT+08:00)</option>
<option value="Asia/Irkutsk">Asia, Irkutsk (GMT+08:00)</option>
<option value="Asia/Kuala_Lumpur">Asia, Kuala Lumpur (GMT+08:00)</option>
<option value="Asia/Kuching">Asia, Kuching (GMT+08:00)</option>
<option value="Asia/Macau">Asia, Macau (GMT+08:00)</option>
<option value="Asia/Makassar">Asia, Makassar (GMT+08:00)</option>
<option value="Asia/Manila">Asia, Manila (GMT+08:00)</option>
<option value="Asia/Shanghai">Asia, Shanghai (GMT+08:00)</option>
<option value="Asia/Singapore">Asia, Singapore (GMT+08:00)</option>
<option value="Asia/Taipei">Asia, Taipei (GMT+08:00)</option>
<option value="Australia/Perth">Australia, Perth (GMT+08:00)</option>
<option value="Asia/Pyongyang">Asia, Pyongyang (GMT+08:30)</option>
<option value="Australia/Eucla">Australia, Eucla (GMT+08:45)</option>
<option value="Asia/Chita">Asia, Chita (GMT+09:00)</option>
<option value="Asia/Choibalsan">Asia, Choibalsan (GMT+09:00)</option>
<option value="Asia/Dili">Asia, Dili (GMT+09:00)</option>
<option value="Asia/Jayapura">Asia, Jayapura (GMT+09:00)</option>
<option value="Asia/Khandyga">Asia, Khandyga (GMT+09:00)</option>
<option value="Asia/Seoul">Asia, Seoul (GMT+09:00)</option>
<option value="Asia/Tokyo">Asia, Tokyo (GMT+09:00)</option>
<option value="Asia/Ulaanbaatar">Asia, Ulaanbaatar (GMT+09:00)</option>
<option value="Asia/Yakutsk">Asia, Yakutsk (GMT+09:00)</option>
<option value="Pacific/Palau">Pacific, Palau (GMT+09:00)</option>
<option value="Australia/Adelaide">Australia, Adelaide (GMT+09:30)</option>
<option value="Australia/Broken_Hill">Australia, Broken Hill (GMT+09:30)</option>
<option value="Australia/Darwin">Australia, Darwin (GMT+09:30)</option>
<option value="Antarctica/DumontDUrville">Antarctica, DumontDUrville (GMT+10:00)</option>
<option value="Asia/Ust-Nera">Asia, Ust-Nera (GMT+10:00)</option>
<option value="Asia/Vladivostok">Asia, Vladivostok (GMT+10:00)</option>
<option value="Australia/Brisbane">Australia, Brisbane (GMT+10:00)</option>
<option value="Australia/Currie">Australia, Currie (GMT+10:00)</option>
<option value="Australia/Hobart">Australia, Hobart (GMT+10:00)</option>
<option value="Australia/Lindeman">Australia, Lindeman (GMT+10:00)</option>
<option value="Australia/Melbourne">Australia, Melbourne (GMT+10:00)</option>
<option value="Australia/Sydney">Australia, Sydney (GMT+10:00)</option>
<option value="Pacific/Chuuk">Pacific, Chuuk (GMT+10:00)</option>
<option value="Pacific/Guam">Pacific, Guam (GMT+10:00)</option>
<option value="Pacific/Port_Moresby">Pacific, Port Moresby (GMT+10:00)</option>
<option value="Pacific/Saipan">Pacific, Saipan (GMT+10:00)</option>
<option value="Australia/Lord_Howe">Australia, Lord Howe (GMT+10:30)</option>
<option value="Antarctica/Casey">Antarctica, Casey (GMT+11:00)</option>
<option value="Antarctica/Macquarie">Antarctica, Macquarie (GMT+11:00)</option>
<option value="Asia/Magadan">Asia, Magadan (GMT+11:00)</option>
<option value="Asia/Sakhalin">Asia, Sakhalin (GMT+11:00)</option>
<option value="Asia/Srednekolymsk">Asia, Srednekolymsk (GMT+11:00)</option>
<option value="Pacific/Bougainville">Pacific, Bougainville (GMT+11:00)</option>
<option value="Pacific/Efate">Pacific, Efate (GMT+11:00)</option>
<option value="Pacific/Guadalcanal">Pacific, Guadalcanal (GMT+11:00)</option>
<option value="Pacific/Kosrae">Pacific, Kosrae (GMT+11:00)</option>
<option value="Pacific/Norfolk">Pacific, Norfolk (GMT+11:00)</option>
<option value="Pacific/Noumea">Pacific, Noumea (GMT+11:00)</option>
<option value="Pacific/Pohnpei">Pacific, Pohnpei (GMT+11:00)</option>
<option value="Antarctica/McMurdo">Antarctica, McMurdo (GMT+12:00)</option>
<option value="Asia/Anadyr">Asia, Anadyr (GMT+12:00)</option>
<option value="Asia/Kamchatka">Asia, Kamchatka (GMT+12:00)</option>
<option value="Pacific/Auckland">Pacific, Auckland (GMT+12:00)</option>
<option value="Pacific/Fiji">Pacific, Fiji (GMT+12:00)</option>
<option value="Pacific/Funafuti">Pacific, Funafuti (GMT+12:00)</option>
<option value="Pacific/Kwajalein">Pacific, Kwajalein (GMT+12:00)</option>
<option value="Pacific/Majuro">Pacific, Majuro (GMT+12:00)</option>
<option value="Pacific/Nauru">Pacific, Nauru (GMT+12:00)</option>
<option value="Pacific/Tarawa">Pacific, Tarawa (GMT+12:00)</option>
<option value="Pacific/Wake">Pacific, Wake (GMT+12:00)</option>
<option value="Pacific/Wallis">Pacific, Wallis (GMT+12:00)</option>
<option value="Pacific/Chatham">Pacific, Chatham (GMT+12:45)</option>
<option value="Pacific/Apia">Pacific, Apia (GMT+13:00)</option>
<option value="Pacific/Enderbury">Pacific, Enderbury (GMT+13:00)</option>
<option value="Pacific/Fakaofo">Pacific, Fakaofo (GMT+13:00)</option>
<option value="Pacific/Tongatapu">Pacific, Tongatapu (GMT+13:00)</option>
<option value="Pacific/Kiritimati">Pacific, Kiritimati (GMT+14:00)</option>

If you've come up with some other way to get the currently-logged-in user's timezone, you can override this behavior by specifying your own callback function. Just to be safe, you'll probably want to return the app's default timezone (that you configured above), if no user is logged in...

Timezone::setCurrentUsersTimezoneFunction(function() {
	if (MyFancyUser()->isLoggedIn())
		return MyFancyUser()->getTheirTimezone();
	else
		return config('app.timezone');
});

Usage

There are two methods which you can use to convert date/times to and from the storage timezone. These are convertToStorage and convertFromStorage. Both of them accept a date/time as the first parameter, which can be essentially any representation of a date, including DateTime, string, timestamp, another Carbon instance, etc. They'll also both return a Carbon instance of the converted date.

Use convertToStorage on a user--supplied date/time before storing it in the database. After retrieving a date/time from the database, use convertFromStorage to convert it to the user's local timezone before displaying it. If you're doing an SPA, consider skipping convertFromStorage entirely, and instead doing the conversion on the client-side using something like Moment.js.

convertToStorage($date = null, $fromTimezone = null)

Converts a date from the user's timezone into a Carbon date adjusted for the storage timezone.

@param Carbon|DateTime|string|int $date The date to convert (or now, if not specified). Can be a Carbon, DateTime, string, timestamp, etc.
@param string $fromTimezone If specified, the date will be converted from this timezone. Otherwise, the current user's timezone is assumed.

@return Carbon The converted date

//Example...
$carbonDate = Timezone::convertToStorage('2017-12-10 12:10:00');

convertFromStorage($date = null, $toTimezone = null)

Converts a date from storage into a Carbon date adjusted to the user's timezone.

@param Carbon|DateTime|string|int $date The date to convert (or now, if not specified). Can be a Carbon, DateTime, string, timestamp, etc.
@param string $toTimezone If specified, the date will be converted to this timezone. Otherwise, the current user's timezone is assumed.

@return Carbon The converted date

//Example...
$carbonDate = Timezone::convertFromStorage('2017-12-10 12:10:00');

Credits

Inspired by camroncade/timezone