我目前正在使用开源应用程序:WeBid(可用here)
问题在于:
应用程序无法正确计算DST(夏令时),因为它使用以下代码:
(包括/ functions_global.php)
$this->ctime = time() + (($this->SETTINGS['timecorrection'] + gmdate('I')) * 3600);
$this->tdiff = ($this->SETTINGS['timecorrection'] + gmdate('I')) * 3600;
gtpotyf解释道:
gmdate('I') - >如果DST处于活动状态则返回1,如果未激活则返回0。然而 因为gmdate总是使用GMT(+0)并且该时区没有DST 总是返回0。
使用日期('I')代替gmdate('I')会更好,但会 仍然不正确,因为它使用服务器的时区和 仍然不是用户时区。
WeBid的最新版本未采纳最终更正,请帮我解决此问题。
答案 0 :(得分:4)
为了正确理清时区,你需要做很多事情。
将服务器设置为UTC,以便PHP的time
和date
函数返回UTC时间戳。 (除了strftime
等相关功能外。
根据您的数据库,您也可以将其时区设置为UTC。 MySQL关于这个主题的文档是here。
如果还没有,那么您需要将存储在那里的日期时间迁移到UTC。 (我不确定你对GMT-0的意思。)
让用户选择PHP的DateTimeZone类支持的“欧洲/伦敦”格式的时区。
经过一些研究,我将以下一系列时区放在一个下拉框中给用户,因为我不想重复(例如阿姆斯特丹和布鲁塞尔在同一时区。)我不会声称它是完美的。根据您的用户群,您可能需要更详细地调查某些时区。
$timezones = array(
'Pacific/Midway' => '(UTC-11:00) Midway Island, Samoa',
'Pacific/Honolulu' => '(UTC-10:00) Hawaii-Aleutian',
'Pacific/Marquesas' => '(UTC-09:30) Marquesas Islands',
'Pacific/Gambier' => '(UTC-09:00) Gambier Islands',
'America/Anchorage' => '(UTC-09:00) Alaska',
'America/Ensenada' => '(UTC-08:00) Tijuana, Baja California',
'Etc/GMT+8' => '(UTC-08:00) Pitcairn Islands',
'America/Los_Angeles' => '(UTC-08:00) Pacific Time (US & Canada)',
'America/Denver' => '(UTC-07:00) Mountain Time (US & Canada)',
'America/Chihuahua' => '(UTC-07:00) Chihuahua, La Paz, Mazatlan',
'America/Dawson_Creek' => '(UTC-07:00) Arizona',
'America/Belize' => '(UTC-06:00) Saskatchewan, Central America',
'America/Cancun' => '(UTC-06:00) Guadalajara, Mexico City, Monterrey',
'Chile/EasterIsland' => '(UTC-06:00) Easter Island',
'America/Chicago' => '(UTC-06:00) Central Time (US & Canada)',
'America/New_York' => '(UTC-05:00) Eastern Time (US & Canada)',
'America/Havana' => '(UTC-05:00) Cuba',
'America/Bogota' => '(UTC-05:00) Bogota, Lima, Quito, Rio Branco',
'America/Caracas' => '(UTC-04:30) Caracas',
'America/Santiago' => '(UTC-04:00) Santiago',
'America/La_Paz' => '(UTC-04:00) La Paz',
'Atlantic/Stanley' => '(UTC-04:00) Falkland Islands',
'America/Campo_Grande' => '(UTC-04:00) Brazil',
'America/Goose_Bay' => '(UTC-04:00) Atlantic Time (Goose Bay)',
'America/Glace_Bay' => '(UTC-04:00) Atlantic Time (Canada)',
'America/St_Johns' => '(UTC-03:30) Newfoundland',
'America/Araguaina' => '(UTC-03:00) UTC-3',
'America/Montevideo' => '(UTC-03:00) Montevideo',
'America/Miquelon' => '(UTC-03:00) Miquelon, St. Pierre',
'America/Godthab' => '(UTC-03:00) Greenland',
'America/Argentina/Buenos_Aires' => '(UTC-03:00) Buenos Aires',
'America/Sao_Paulo' => '(UTC-03:00) Brasilia',
'America/Noronha' => '(UTC-02:00) Mid-Atlantic',
'Atlantic/Cape_Verde' => '(UTC-01:00) Cape Verde Is.',
'Atlantic/Azores' => '(UTC-01:00) Azores',
'Europe/Dublin' => '(UTC) Irish Standard Time : Dublin',
'Europe/Lisbon' => '(UTC) Western European Time : Lisbon',
'Europe/London' => '(GMT) Greenwich Mean Time : London, Belfast',
'Africa/Abidjan' => '(GMT) Monrovia, Reykjavik',
'Europe/Amsterdam' => '(UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna',
'Europe/Belgrade' => '(UTC+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague',
'Europe/Brussels' => '(UTC+01:00) Brussels, Copenhagen, Madrid, Paris',
'Africa/Algiers' => '(UTC+01:00) West Central Africa',
'Africa/Windhoek' => '(UTC+01:00) Windhoek',
'Asia/Beirut' => '(UTC+02:00) Beirut',
'Africa/Cairo' => '(UTC+02:00) Cairo',
'Asia/Gaza' => '(UTC+02:00) Gaza',
'Africa/Johannesburg' => '(UTC+02:00) Johannesburg, Harare, Pretoria',
'Asia/Jerusalem' => '(UTC+02:00) Jerusalem',
'Europe/Athens' => '(UTC+02:00) Athens',
'Europe/Minsk' => '(UTC+02:00) Minsk',
'Asia/Damascus' => '(UTC+02:00) Syria',
'Europe/Moscow' => '(UTC+03:00) Moscow, St. Petersburg, Volgograd',
'Africa/Addis_Ababa' => '(UTC+03:00) Nairobi',
'Asia/Tehran' => '(UTC+03:30) Tehran',
'Asia/Dubai' => '(UTC+04:00) Abu Dhabi, Muscat',
'Asia/Yerevan' => '(UTC+04:00) Yerevan',
'Asia/Kabul' => '(UTC+04:30) Kabul',
'Asia/Yekaterinburg' => '(UTC+05:00) Ekaterinburg',
'Asia/Tashkent' => '(UTC+05:00) Tashkent',
'Asia/Kolkata' => '(UTC+05:30) Chennai, Kolkata, Mumbai, New Delhi',
'Asia/Katmandu' => '(UTC+05:45) Kathmandu',
'Asia/Dhaka' => '(UTC+06:00) Astana, Dhaka',
'Asia/Novosibirsk' => '(UTC+06:00) Novosibirsk',
'Asia/Rangoon' => '(UTC+06:30) Yangon (Rangoon)',
'Asia/Bangkok' => '(UTC+07:00) Bangkok, Hanoi, Jakarta',
'Asia/Krasnoyarsk' => '(UTC+07:00) Krasnoyarsk',
'Asia/Hong_Kong' => '(UTC+08:00) Beijing, Chongqing, Hong Kong, Urumqi',
'Asia/Irkutsk' => '(UTC+08:00) Irkutsk, Ulaan Bataar',
'Australia/Perth' => '(UTC+08:00) Perth',
'Australia/Eucla' => '(UTC+08:45) Eucla',
'Asia/Tokyo' => '(UTC+09:00) Osaka, Sapporo, Tokyo',
'Asia/Seoul' => '(UTC+09:00) Seoul',
'Asia/Yakutsk' => '(UTC+09:00) Yakutsk',
'Australia/Adelaide' => '(UTC+09:30) Adelaide',
'Australia/Darwin' => '(UTC+09:30) Darwin',
'Australia/Sydney' => '(UTC+10:00) Sydney, Canberra, Brisbane',
'Australia/Hobart' => '(UTC+10:00) Hobart',
'Asia/Vladivostok' => '(UTC+10:00) Vladivostok',
'Australia/Lord_Howe' => '(UTC+10:30) Lord Howe Island',
'Etc/GMT-11' => '(UTC+11:00) Solomon Is., New Caledonia',
'Asia/Magadan' => '(UTC+11:00) Magadan',
'Pacific/Norfolk' => '(UTC+11:30) Norfolk Island',
'Asia/Anadyr' => '(UTC+12:00) Anadyr, Kamchatka',
'Pacific/Auckland' => '(UTC+12:00) Auckland, Wellington',
'Etc/GMT-12' => '(UTC+12:00) Fiji, Kamchatka, Marshall Is.',
'Pacific/Chatham' => '(UTC+12:45) Chatham Islands',
'Pacific/Tongatapu' => '(UTC+13:00) Nuku Alofa',
'Pacific/Kiritimati' => '(UTC+14:00) Kiritimati'
);
当数据库出现日期时,需要将它们从UTC转换为用户的时区。
$timestamp = time(); // or a timestamp from your DB
# create server and user timezone objects
$fromZone = new DateTimeZone('UTC'); // UTC
$toZone = new DateTimeZone($userTimezone); // Europe/London, or whatever it happens to be
$time = date('Y-m-d H:i:s', $timestamp);
$dt = new DateTime($time, $fromZone);
echo $dt->format('Y-m-d H:i:s'); // Still UTC
$dt->setTimezone($toZone);
echo $dt->format('Y-m-d H:i:s'); // Converted
您需要浏览WeBid应用程序并修改相应的部分才能正确转换。
所以,使用上面的代码,你需要一些像这样的函数:
function getConvertedDateTimeObject($timestamp, $userTimezone){
# create server and user timezone objects
$fromZone = new DateTimeZone('UTC'); // UTC
$toZone = new DateTimeZone($userTimezone); // Europe/London, or whatever it happens to be
$time = date('Y-m-d H:i:s', $timestamp);
$dt = new DateTime($time, $fromZone);
$dt->setTimezone($toZone);
return $dt;
}
function getUserTimestamp($timestamp, $userTimezone){
$dt = getConvertedDateTimeObject($timestamp, $userTimezone);
return $dt->getTimestamp();
}
function getUserOffset($timestamp, $userTimezone){
$dt = getConvertedDateTimeObject($timestamp, $userTimezone);
return $dt->getOffset();
}
然后在你的课堂上:
$this->ctime = getUserTimestamp(time(), $userTimezone); // I assume you have access to the user's timezone?
$this->tdiff = getUserOffset(time(), $userTimezone);
答案 1 :(得分:0)
bcmcfc答案的替代解决方案(几乎说明了一切):
从WeBid中删除所有时区支持(至少禁用任何自定义)并将所有内容保存为UTC(如果尚未保存)。
修改界面以使用Javascript显示日期和时间戳。浏览器将正确转换unix时间戳(不要忘记乘以1000,Javascript的Date
需要毫秒,而不是PHP中的秒数),具体取决于浏览器或操作系统的设置。
例如,您不会输出2012-08-18 09:33:43,而是输出<script>document.write(new Date(1345282423*1000).toString());</script>
,其中1345282423
直接从数据库中获取,或使用strtotime
。
您只需要更改显示日期和时间戳的功能,并禁用时区自定义(强制UTC / GMT)(不要忘记date_default_timezone_set("UTC");
)。
这对我来说似乎微不足道。