Hướng dẫn dùng gmt+8 timezone trong PHP

simple question, but cannot seem to find an answer

I need to set a timezone to UTC-8 and only UTC-8 (GMT-8 is actually the same). It cannot be a timezone with daylight time saving.

Now PHP does not seem to provide a way to set to GMT-8, when using Etc/GMT-8 I get the wrong time (I get an offset way earlier) like it says in the DOCS

Now I could use GMT+8 to achieve GMT-8 (sounds odd but i Quote:

Warning If you disregard the above warning, please also note that the IANA timezone database that provides PHP's timezone support uses POSIX style signs, which results in the Etc/GMT+n and Etc/GMT-n time zones being reversed from common usage. For example, the time zone 8 hours ahead of GMT that is used in China and Western Australia (among other places) is actually Etc/GMT-8 in this database, not Etc/GMT+8 as you would normally expect.

as there is no country in exactly UTC-8, i cannot put a country there...

so I use Etc/GMT+8 and cross the fingers they wont change it?

asked Mar 10, 2017 at 18:23

1

Yes, you can absolutely use Etc/GMT+8 for a time zone that is fixed to UTC-8. No, it won't change. IANA time zone names are identifiers, and they are guaranteed to not be removed from the tz database.

That said, I'd ask you to question why you need a UTC-8 fixed offset time zone:

• Is it because you are referencing time on Pitcairn Islands (population 49)? If so, use Pacific/Pitcairn.

• Is it because you are calculating time for a ship at sea that is traveling between 112.5°W and 127.5°W latitude? If so, use Etc/GMT+8.

• Is it because you think DST isn't important, or you don't like it, or you were given a requirement that doesn't include it, etc? Sorry, but like it or not - the people who physically occupy these areas do use DST. If you elect not to, your clock will disagree with theirs for a considerable part of the year. Use America/Los_Angeles, America/Tijuana, America/Vancouver, America/Dawson, or America/Whitehorse.

answered Mar 12, 2017 at 6:12

Matt Johnson-PintMatt Johnson-Pint

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1

Not the answer you're looking for? Browse other questions tagged php date datetime timezone or ask your own question.

Để giải quyết vấn đề này có nhiều cách, tuy nhiên trong chuyên đề này mình đi về time trong php nên mình sẽ dùng luôn hàm set lại muối giờ:.

Nếu bạn muốn thay đổi cấu hình múi giờ cho PHP script, bạn có thể chèn đoạn mã sau vào phần mã PHP của bạn:

\\ echo “Original Time: “. date(“h:i:s”).”\n”;
putenv(“TZ=US/Eastern”);
\\ echo “New Time: “. date(“h:i:s”).”\n”;
?>

Danh sách các mã múi giờ để sử dụng thay cho giá trị “US/Eastern” trong hàm putenv() có thể tìm thấy ở đây.

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 & 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 & Canada)’ => ‘US/Mountain’,
‘(UTC-06:00) Central America’ => ‘America/Managua’,
‘(UTC-06:00) Central Time (US & 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 & 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’
);