How to get timezone name by passing Datetime string to date_default_timezone_set

Krishna_ramisetty · May 6, 2021

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

gw1500se · May 6, 2021

This should help.

maxxd · May 6, 2021

Or this.

Krishna_ramisetty · May 6, 2021

45 minutes ago, gw1500se said:

This should help.

Not getting exactly what's happening here as I am new to PHP. any demonstration will be helpful a lot for me

gw1500se · May 6, 2021

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 May 6, 2021 by gw1500se

Barand · May 6, 2021

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',
  ),
);

maxxd · May 7, 2021

2 hours ago, Barand said:

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 ..

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

Psycho · May 7, 2021

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 May 7, 2021 by Psycho

Krishna_ramisetty · May 7, 2021

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));

Psycho · May 7, 2021

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 May 7, 2021 by Psycho

maxxd · May 7, 2021

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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How to get timezone name by passing Datetime string to date_default_timezone_set

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