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How to get timezone name by passing Datetime string to date_default_timezone_set


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Hello Everyone, 

 

I have below datetime string 2021-05-06T13:48:19.2064951+05:30 i need to get the server timezone name by passing this string to date_default_timezone_set(). 

here is it valid?

can somebody please help me i need the timezone name with above datetime string 

Thanks,

Krish

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Posted (edited)

There is an example in the manual. You simply create a datetime object using your date string then use the timezone function to get what you need.

Edited by gw1500se
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One problem you will have is that for any offset there are usually several possible names. For your "+05:30" example there are only two but as the array below shows, there are usualy quite a few more ...

$timezones = array (
  '+00:00' => 
  array (
    0 => 'Africa/Abidjan',
    1 => 'Africa/Accra',
    2 => 'Africa/Bamako',
    3 => 'Africa/Banjul',
    4 => 'Africa/Bissau',
    5 => 'Africa/Casablanca',
    6 => 'Africa/Conakry',
    7 => 'Africa/Dakar',
    8 => 'Africa/El_Aaiun',
    9 => 'Africa/Freetown',
    10 => 'Africa/Lome',
    11 => 'Africa/Monrovia',
    12 => 'Africa/Nouakchott',
    13 => 'Africa/Ouagadougou',
    14 => 'Africa/Sao_Tome',
    15 => 'America/Danmarkshavn',
    16 => 'America/Scoresbysund',
    17 => 'Atlantic/Azores',
    18 => 'Atlantic/Reykjavik',
    19 => 'Atlantic/St_Helena',
    20 => 'UTC',
  ),
  '+01:00' => 
  array (
    0 => 'Africa/Algiers',
    1 => 'Africa/Bangui',
    2 => 'Africa/Brazzaville',
    3 => 'Africa/Douala',
    4 => 'Africa/Kinshasa',
    5 => 'Africa/Lagos',
    6 => 'Africa/Libreville',
    7 => 'Africa/Luanda',
    8 => 'Africa/Malabo',
    9 => 'Africa/Ndjamena',
    10 => 'Africa/Niamey',
    11 => 'Africa/Porto-Novo',
    12 => 'Africa/Tunis',
    13 => 'Atlantic/Canary',
    14 => 'Atlantic/Faroe',
    15 => 'Atlantic/Madeira',
    16 => 'Europe/Dublin',
    17 => 'Europe/Guernsey',
    18 => 'Europe/Isle_of_Man',
    19 => 'Europe/Jersey',
    20 => 'Europe/Lisbon',
    21 => 'Europe/London',
  ),
  '+02:00' => 
  array (
    0 => 'Africa/Blantyre',
    1 => 'Africa/Bujumbura',
    2 => 'Africa/Cairo',
    3 => 'Africa/Ceuta',
    4 => 'Africa/Gaborone',
    5 => 'Africa/Harare',
    6 => 'Africa/Johannesburg',
    7 => 'Africa/Khartoum',
    8 => 'Africa/Kigali',
    9 => 'Africa/Lubumbashi',
    10 => 'Africa/Lusaka',
    11 => 'Africa/Maputo',
    12 => 'Africa/Maseru',
    13 => 'Africa/Mbabane',
    14 => 'Africa/Tripoli',
    15 => 'Africa/Windhoek',
    16 => 'Antarctica/Troll',
    17 => 'Arctic/Longyearbyen',
    18 => 'Europe/Amsterdam',
    19 => 'Europe/Andorra',
    20 => 'Europe/Belgrade',
    21 => 'Europe/Berlin',
    22 => 'Europe/Bratislava',
    23 => 'Europe/Brussels',
    24 => 'Europe/Budapest',
    25 => 'Europe/Busingen',
    26 => 'Europe/Copenhagen',
    27 => 'Europe/Gibraltar',
    28 => 'Europe/Kaliningrad',
    29 => 'Europe/Ljubljana',
    30 => 'Europe/Luxembourg',
    31 => 'Europe/Madrid',
    32 => 'Europe/Malta',
    33 => 'Europe/Monaco',
    34 => 'Europe/Oslo',
    35 => 'Europe/Paris',
    36 => 'Europe/Podgorica',
    37 => 'Europe/Prague',
    38 => 'Europe/Rome',
    39 => 'Europe/San_Marino',
    40 => 'Europe/Sarajevo',
    41 => 'Europe/Skopje',
    42 => 'Europe/Stockholm',
    43 => 'Europe/Tirane',
    44 => 'Europe/Vaduz',
    45 => 'Europe/Vatican',
    46 => 'Europe/Vienna',
    47 => 'Europe/Warsaw',
    48 => 'Europe/Zagreb',
    49 => 'Europe/Zurich',
  ),
  '+03:00' => 
  array (
    0 => 'Africa/Addis_Ababa',
    1 => 'Africa/Asmara',
    2 => 'Africa/Dar_es_Salaam',
    3 => 'Africa/Djibouti',
    4 => 'Africa/Juba',
    5 => 'Africa/Kampala',
    6 => 'Africa/Mogadishu',
    7 => 'Africa/Nairobi',
    8 => 'Antarctica/Syowa',
    9 => 'Asia/Aden',
    10 => 'Asia/Amman',
    11 => 'Asia/Baghdad',
    12 => 'Asia/Bahrain',
    13 => 'Asia/Beirut',
    14 => 'Asia/Damascus',
    15 => 'Asia/Famagusta',
    16 => 'Asia/Gaza',
    17 => 'Asia/Hebron',
    18 => 'Asia/Jerusalem',
    19 => 'Asia/Kuwait',
    20 => 'Asia/Nicosia',
    21 => 'Asia/Qatar',
    22 => 'Asia/Riyadh',
    23 => 'Europe/Athens',
    24 => 'Europe/Bucharest',
    25 => 'Europe/Chisinau',
    26 => 'Europe/Helsinki',
    27 => 'Europe/Istanbul',
    28 => 'Europe/Kiev',
    29 => 'Europe/Kirov',
    30 => 'Europe/Mariehamn',
    31 => 'Europe/Minsk',
    32 => 'Europe/Moscow',
    33 => 'Europe/Riga',
    34 => 'Europe/Simferopol',
    35 => 'Europe/Sofia',
    36 => 'Europe/Tallinn',
    37 => 'Europe/Uzhgorod',
    38 => 'Europe/Vilnius',
    39 => 'Europe/Volgograd',
    40 => 'Europe/Zaporozhye',
    41 => 'Indian/Antananarivo',
    42 => 'Indian/Comoro',
    43 => 'Indian/Mayotte',
  ),
  '+04:00' => 
  array (
    0 => 'Asia/Baku',
    1 => 'Asia/Dubai',
    2 => 'Asia/Muscat',
    3 => 'Asia/Tbilisi',
    4 => 'Asia/Yerevan',
    5 => 'Europe/Astrakhan',
    6 => 'Europe/Samara',
    7 => 'Europe/Saratov',
    8 => 'Europe/Ulyanovsk',
    9 => 'Indian/Mahe',
    10 => 'Indian/Mauritius',
    11 => 'Indian/Reunion',
  ),
  '+04:30' => 
  array (
    0 => 'Asia/Kabul',
    1 => 'Asia/Tehran',
  ),
  '+05:00' => 
  array (
    0 => 'Antarctica/Mawson',
    1 => 'Asia/Aqtau',
    2 => 'Asia/Aqtobe',
    3 => 'Asia/Ashgabat',
    4 => 'Asia/Atyrau',
    5 => 'Asia/Dushanbe',
    6 => 'Asia/Karachi',
    7 => 'Asia/Oral',
    8 => 'Asia/Samarkand',
    9 => 'Asia/Tashkent',
    10 => 'Asia/Yekaterinburg',
    11 => 'Indian/Kerguelen',
    12 => 'Indian/Maldives',
  ),
  '+05:30' => 
  array (
    0 => 'Asia/Colombo',
    1 => 'Asia/Kolkata',
  ),
  '+05:45' => 
  array (
    0 => 'Asia/Kathmandu',
  ),
  '+06:00' => 
  array (
    0 => 'Antarctica/Vostok',
    1 => 'Asia/Almaty',
    2 => 'Asia/Bishkek',
    3 => 'Asia/Dhaka',
    4 => 'Asia/Omsk',
    5 => 'Asia/Qyzylorda',
    6 => 'Asia/Thimphu',
    7 => 'Asia/Urumqi',
    8 => 'Indian/Chagos',
  ),
  '+06:30' => 
  array (
    0 => 'Asia/Yangon',
    1 => 'Indian/Cocos',
  ),
  '+07:00' => 
  array (
    0 => 'Antarctica/Davis',
    1 => 'Asia/Bangkok',
    2 => 'Asia/Barnaul',
    3 => 'Asia/Ho_Chi_Minh',
    4 => 'Asia/Hovd',
    5 => 'Asia/Jakarta',
    6 => 'Asia/Krasnoyarsk',
    7 => 'Asia/Novokuznetsk',
    8 => 'Asia/Novosibirsk',
    9 => 'Asia/Phnom_Penh',
    10 => 'Asia/Pontianak',
    11 => 'Asia/Tomsk',
    12 => 'Asia/Vientiane',
    13 => 'Indian/Christmas',
  ),
  '+08:00' => 
  array (
    0 => 'Asia/Brunei',
    1 => 'Asia/Choibalsan',
    2 => 'Asia/Hong_Kong',
    3 => 'Asia/Irkutsk',
    4 => 'Asia/Kuala_Lumpur',
    5 => 'Asia/Kuching',
    6 => 'Asia/Macau',
    7 => 'Asia/Makassar',
    8 => 'Asia/Manila',
    9 => 'Asia/Shanghai',
    10 => 'Asia/Singapore',
    11 => 'Asia/Taipei',
    12 => 'Asia/Ulaanbaatar',
    13 => 'Australia/Perth',
  ),
  '+08:30' => 
  array (
    0 => 'Asia/Pyongyang',
  ),
  '+08:45' => 
  array (
    0 => 'Australia/Eucla',
  ),
  '+09:00' => 
  array (
    0 => 'Asia/Chita',
    1 => 'Asia/Dili',
    2 => 'Asia/Jayapura',
    3 => 'Asia/Khandyga',
    4 => 'Asia/Seoul',
    5 => 'Asia/Tokyo',
    6 => 'Asia/Yakutsk',
    7 => 'Pacific/Palau',
  ),
  '+09:30' => 
  array (
    0 => 'Australia/Adelaide',
    1 => 'Australia/Broken_Hill',
    2 => 'Australia/Darwin',
  ),
  '+10:00' => 
  array (
    0 => 'Antarctica/DumontDUrville',
    1 => 'Asia/Ust-Nera',
    2 => 'Asia/Vladivostok',
    3 => 'Australia/Brisbane',
    4 => 'Australia/Currie',
    5 => 'Australia/Hobart',
    6 => 'Australia/Lindeman',
    7 => 'Australia/Melbourne',
    8 => 'Australia/Sydney',
    9 => 'Pacific/Chuuk',
    10 => 'Pacific/Guam',
    11 => 'Pacific/Port_Moresby',
    12 => 'Pacific/Saipan',
  ),
  '+10:30' => 
  array (
    0 => 'Australia/Lord_Howe',
  ),
  '+11:00' => 
  array (
    0 => 'Antarctica/Casey',
    1 => 'Antarctica/Macquarie',
    2 => 'Asia/Magadan',
    3 => 'Asia/Sakhalin',
    4 => 'Asia/Srednekolymsk',
    5 => 'Pacific/Bougainville',
    6 => 'Pacific/Efate',
    7 => 'Pacific/Guadalcanal',
    8 => 'Pacific/Kosrae',
    9 => 'Pacific/Norfolk',
    10 => 'Pacific/Noumea',
    11 => 'Pacific/Pohnpei',
  ),
  '+12:00' => 
  array (
    0 => 'Antarctica/McMurdo',
    1 => 'Asia/Anadyr',
    2 => 'Asia/Kamchatka',
    3 => 'Pacific/Auckland',
    4 => 'Pacific/Fiji',
    5 => 'Pacific/Funafuti',
    6 => 'Pacific/Kwajalein',
    7 => 'Pacific/Majuro',
    8 => 'Pacific/Nauru',
    9 => 'Pacific/Tarawa',
    10 => 'Pacific/Wake',
    11 => 'Pacific/Wallis',
  ),
  '+12:45' => 
  array (
    0 => 'Pacific/Chatham',
  ),
  '+13:00' => 
  array (
    0 => 'Pacific/Apia',
    1 => 'Pacific/Enderbury',
    2 => 'Pacific/Fakaofo',
    3 => 'Pacific/Tongatapu',
  ),
  '+14:00' => 
  array (
    0 => 'Pacific/Kiritimati',
  ),
  '-01:00' => 
  array (
    0 => 'Atlantic/Cape_Verde',
  ),
  '-02:-30' => 
  array (
    0 => 'America/St_Johns',
  ),
  '-02:00' => 
  array (
    0 => 'America/Godthab',
    1 => 'America/Miquelon',
    2 => 'America/Noronha',
    3 => 'Atlantic/South_Georgia',
  ),
  '-03:00' => 
  array (
    0 => 'America/Araguaina',
    1 => 'America/Argentina/Buenos_Aires',
    2 => 'America/Argentina/Catamarca',
    3 => 'America/Argentina/Cordoba',
    4 => 'America/Argentina/Jujuy',
    5 => 'America/Argentina/La_Rioja',
    6 => 'America/Argentina/Mendoza',
    7 => 'America/Argentina/Rio_Gallegos',
    8 => 'America/Argentina/Salta',
    9 => 'America/Argentina/San_Juan',
    10 => 'America/Argentina/San_Luis',
    11 => 'America/Argentina/Tucuman',
    12 => 'America/Argentina/Ushuaia',
    13 => 'America/Bahia',
    14 => 'America/Belem',
    15 => 'America/Cayenne',
    16 => 'America/Fortaleza',
    17 => 'America/Glace_Bay',
    18 => 'America/Goose_Bay',
    19 => 'America/Halifax',
    20 => 'America/Maceio',
    21 => 'America/Moncton',
    22 => 'America/Montevideo',
    23 => 'America/Paramaribo',
    24 => 'America/Punta_Arenas',
    25 => 'America/Recife',
    26 => 'America/Santarem',
    27 => 'America/Santiago',
    28 => 'America/Sao_Paulo',
    29 => 'America/Thule',
    30 => 'Antarctica/Palmer',
    31 => 'Antarctica/Rothera',
    32 => 'Atlantic/Bermuda',
    33 => 'Atlantic/Stanley',
  ),
  '-04:00' => 
  array (
    0 => 'America/Anguilla',
    1 => 'America/Antigua',
    2 => 'America/Aruba',
    3 => 'America/Asuncion',
    4 => 'America/Barbados',
    5 => 'America/Blanc-Sablon',
    6 => 'America/Boa_Vista',
    7 => 'America/Campo_Grande',
    8 => 'America/Caracas',
    9 => 'America/Cuiaba',
    10 => 'America/Curacao',
    11 => 'America/Detroit',
    12 => 'America/Dominica',
    13 => 'America/Grand_Turk',
    14 => 'America/Grenada',
    15 => 'America/Guadeloupe',
    16 => 'America/Guyana',
    17 => 'America/Havana',
    18 => 'America/Indiana/Indianapolis',
    19 => 'America/Indiana/Marengo',
    20 => 'America/Indiana/Petersburg',
    21 => 'America/Indiana/Vevay',
    22 => 'America/Indiana/Vincennes',
    23 => 'America/Indiana/Winamac',
    24 => 'America/Iqaluit',
    25 => 'America/Kentucky/Louisville',
    26 => 'America/Kentucky/Monticello',
    27 => 'America/Kralendijk',
    28 => 'America/La_Paz',
    29 => 'America/Lower_Princes',
    30 => 'America/Manaus',
    31 => 'America/Marigot',
    32 => 'America/Martinique',
    33 => 'America/Montserrat',
    34 => 'America/Nassau',
    35 => 'America/New_York',
    36 => 'America/Nipigon',
    37 => 'America/Pangnirtung',
    38 => 'America/Port-au-Prince',
    39 => 'America/Port_of_Spain',
    40 => 'America/Porto_Velho',
    41 => 'America/Puerto_Rico',
    42 => 'America/Santo_Domingo',
    43 => 'America/St_Barthelemy',
    44 => 'America/St_Kitts',
    45 => 'America/St_Lucia',
    46 => 'America/St_Thomas',
    47 => 'America/St_Vincent',
    48 => 'America/Thunder_Bay',
    49 => 'America/Toronto',
    50 => 'America/Tortola',
  ),
  '-05:00' => 
  array (
    0 => 'America/Atikokan',
    1 => 'America/Bahia_Banderas',
    2 => 'America/Bogota',
    3 => 'America/Cancun',
    4 => 'America/Cayman',
    5 => 'America/Chicago',
    6 => 'America/Eirunepe',
    7 => 'America/Guayaquil',
    8 => 'America/Indiana/Knox',
    9 => 'America/Indiana/Tell_City',
    10 => 'America/Jamaica',
    11 => 'America/Lima',
    12 => 'America/Matamoros',
    13 => 'America/Menominee',
    14 => 'America/Merida',
    15 => 'America/Mexico_City',
    16 => 'America/Monterrey',
    17 => 'America/North_Dakota/Beulah',
    18 => 'America/North_Dakota/Center',
    19 => 'America/North_Dakota/New_Salem',
    20 => 'America/Panama',
    21 => 'America/Rainy_River',
    22 => 'America/Rankin_Inlet',
    23 => 'America/Resolute',
    24 => 'America/Rio_Branco',
    25 => 'America/Winnipeg',
    26 => 'Pacific/Easter',
  ),
  '-06:00' => 
  array (
    0 => 'America/Belize',
    1 => 'America/Boise',
    2 => 'America/Cambridge_Bay',
    3 => 'America/Chihuahua',
    4 => 'America/Costa_Rica',
    5 => 'America/Denver',
    6 => 'America/Edmonton',
    7 => 'America/El_Salvador',
    8 => 'America/Guatemala',
    9 => 'America/Inuvik',
    10 => 'America/Managua',
    11 => 'America/Mazatlan',
    12 => 'America/Ojinaga',
    13 => 'America/Regina',
    14 => 'America/Swift_Current',
    15 => 'America/Tegucigalpa',
    16 => 'America/Yellowknife',
    17 => 'Pacific/Galapagos',
  ),
  '-07:00' => 
  array (
    0 => 'America/Creston',
    1 => 'America/Dawson',
    2 => 'America/Dawson_Creek',
    3 => 'America/Fort_Nelson',
    4 => 'America/Hermosillo',
    5 => 'America/Los_Angeles',
    6 => 'America/Phoenix',
    7 => 'America/Tijuana',
    8 => 'America/Vancouver',
    9 => 'America/Whitehorse',
  ),
  '-08:00' => 
  array (
    0 => 'America/Anchorage',
    1 => 'America/Juneau',
    2 => 'America/Metlakatla',
    3 => 'America/Nome',
    4 => 'America/Sitka',
    5 => 'America/Yakutat',
    6 => 'Pacific/Pitcairn',
  ),
  '-09:-30' => 
  array (
    0 => 'Pacific/Marquesas',
  ),
  '-09:00' => 
  array (
    0 => 'America/Adak',
    1 => 'Pacific/Gambier',
  ),
  '-10:00' => 
  array (
    0 => 'Pacific/Honolulu',
    1 => 'Pacific/Rarotonga',
    2 => 'Pacific/Tahiti',
  ),
  '-11:00' => 
  array (
    0 => 'Pacific/Midway',
    1 => 'Pacific/Niue',
    2 => 'Pacific/Pago_Pago',
  ),
);

 

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Posted (edited)
3 hours ago, maxxd said:

Legit question - does https://www.php.net/manual/en/datetime.gettimezone.php not handle that?

Look at the code examples on that page. The examples first create a datetime object with a specific timezone and then use gettimezone to retrieve the timezone that was previously set. A string such as "2021-05-06T13:48:19.2064951+05:30" has only the offset from UTC time - there is no timezone identifier. So, there is no way to programmatically determine the correct timezone out of the ones that share that offset.

Edited by Psycho
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4 hours ago, maxxd said:

Legit question - does https://www.php.net/manual/en/datetime.gettimezone.php not handle that?

Hi, 

here i am getting the time zone name as well. but in timezone_name_from_abbr() what is 19800, 0 and how to calculate it?
    $time = '2021-05-06T19:48:19.2064951+05:30';    
    $dt = new DateTime($time);    
    error_log($dt->getTimezone()->getName());
    error_log(timezone_name_from_abbr("", 19800, 0));

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Posted (edited)
16 minutes ago, Krishna_ramisetty said:

Hi, 

here i am getting the time zone name as well. but in timezone_name_from_abbr() what is 19800, 0 and how to calculate it?
    $time = '2021-05-06T19:48:19.2064951+05:30';    
    $dt = new DateTime($time);    
    error_log($dt->getTimezone()->getName());
    error_log(timezone_name_from_abbr("", 19800, 0));

5.5 (i.e. 5:30) * 60 (minutes) * 60 (seconds) = 19800

I assume the 0 represent the first element of the array of timezone within the +5:30 UTC offset - 'Asia/Colombo'. Further, I expect you will ALWAYS get the first timezone corresponding to the UTC offset (as a default) because there is no way that an actual timezone can be specified in the string value you are using.

  '+05:30' => 
  array (
    0 => 'Asia/Colombo',
    1 => 'Asia/Kolkata',
  ),
Edited by Psycho
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7 hours ago, Psycho said:

Look at the code examples on that page. The examples first create a datetime object with a specific timezone and then use gettimezone to retrieve the timezone that was previously set. A string such as "2021-05-06T13:48:19.2064951+05:30" has only the offset from UTC time - there is no timezone identifier. So, there is no way to programmatically determine the correct timezone out of the ones that share that offset.

Gotcha - I didn't read everything correctly. Thank you!

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