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Implement more precise timezone handling in edge cases

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This commit is contained in:
Kijin Sung 2016-02-11 21:27:36 +09:00
parent b7f04d03bf
commit aaa3e25ad5
3 changed files with 21 additions and 2 deletions
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15
common/framework/datetime.php
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@ -125,6 +125,12 @@ class DateTime
/**
* Get a PHP time zone by UTC offset.
*
* Time zones with both (a) fractional offsets and (b) daylight saving time
* (such as Iran's +03:30/+04:30) cannot be converted in this way.
* However, if Rhymix is installed for the first time in such a time zone,
* the internal time zone will be automatically set to UTC,
* so this should never be a problem in practice.
*
* @param int $offset
* @return bool
*/
@ -133,6 +139,15 @@ class DateTime
switch ($offset)
{
case 0: return 'Etc/UTC';
case -34200: return 'Pacific/Marquesas'; // -09:30
case -16200: return 'America/Caracas'; // -04:30
case 16200: return 'Asia/Kabul'; // +04:30
case 19800: return 'Asia/Kolkata'; // +05:30
case 20700: return 'Asia/Kathmandu'; // +05:45
case 23400: return 'Asia/Rangoon'; // +06:30
case 30600: return 'Asia/Pyongyang'; // +08:30
case 31500: return 'Australia/Eucla'; // +08:45
case 34200: return 'Australia/Darwin'; // +09:30
default: return 'Etc/GMT' . ($offset > 0 ? '-' : '+') . intval(abs($offset / 3600));
}
}