使用时区偏移将GMT时间转换为本地时间,而不是时区标识 [英] Converting GMT time to local time using timezone offset, not timezone identifier
问题描述
例如,你可以做这里($ fromTimeZone只是'GMT',$ toTimeZone只是列表中的一个常量(即'America / Chicago'),而$ datetime是GMT日期):
public static function convertToTimezone($ datetime,$ fromTimeZone,$ toTimeZone,$ format ='Ymd H:i')
{
//构造一个新的DateTime对象从给定的时间,设置在原始时区
$ convertedDateTime = new DateTime($ datetime,timezone_open($ fromTimeZone));
//将发布的日期转换为新的时区
$ convertedDateTime-> setTimezone(timezone_open($ toTimeZone));
//以给定的格式返回udpated日期
return $ convertedDateTime-> format($ format);
}
但是,我有问题将相同的GMT日期转换为当地时间如果刚刚给出时区偏移。例如,而不是被赋予美国/芝加哥,我被赋予-0500(这是该时区的等效偏移量)。
我已经尝试过了例如以下(其中$ datetime是我的GMT日期,$ toTimeZone是偏移量(在这种情况下为-0500)):
date($ format,strtotime($ datetime。'。$ toTimeZone))
我知道所有date()类的函数是基于服务器的时区。我似乎无法让它忽略,并使用明确给出的时区偏移。
你可以转换对DateTimeZone的具体偏移量:
$ offset ='-0500';
$ isDST = 1; //夏令时1 - 开,0 - 关
$ timezoneName = timezone_name_from_abbr('',intval($ offset,10)* 36,$ isDST);
$ timezone = new DateTimeZone($ timezoneName);
然后,您可以在DateTime构造函数中使用它,例如
$ datetime = new DateTime('2012-04-21 01:13:30',$ timezone);
或与setter:
$ datetime-> setTimezone($ timezone);
在后一种情况下,如果 $ datetime
使用不同的时区构建,日期/时间将转换为指定的时区。
It's pretty easy to convert a given GMT date into local time if you're given the timezone identifier from this list in PHP: http://www.php.net/manual/en/timezones.php
For example, you can do this (where $fromTimeZone is just 'GMT', $toTimeZone is just one of the constants from that list (i.e. 'America/Chicago'), and $datetime is the GMT date):
public static function convertToTimezone($datetime, $fromTimeZone, $toTimeZone, $format = 'Y-m-d H:i')
{
// Construct a new DateTime object from the given time, set in the original timezone
$convertedDateTime = new DateTime($datetime, timezone_open($fromTimeZone));
// Convert the published date to the new timezone
$convertedDateTime->setTimezone(timezone_open($toTimeZone));
// Return the udpated date in the format given
return $convertedDateTime->format($format);
}
However, I'm having issue converting the same GMT date to the local time if just given the timezone offset. For instance, instead of being given 'America/Chicago', I'm given -0500 (which is the equivalent offset for that timezone).
I've tried things such as the following (where $datetime is my GMT date and $toTimeZone is the offset (-0500 in this case)):
date($format, strtotime($datetime . ' ' . $toTimeZone))
I know all the date() sort of functions are based on the servers's timezone. I just can't seem to get it to ignore that and use a timezone offset that is given explicitly.
You can convert a specific offset to a DateTimeZone:
$offset = '-0500';
$isDST = 1; // Daylight Saving 1 - on, 0 - off
$timezoneName = timezone_name_from_abbr('', intval($offset, 10) * 36, $isDST);
$timezone = new DateTimeZone($timezoneName);
Then you can use it in a DateTime constructor, e.g.
$datetime = new DateTime('2012-04-21 01:13:30', $timezone);
or with the setter:
$datetime->setTimezone($timezone);
In the latter case, if $datetime
was constructed with a different timezone, the date/time will be converted to specified timezone.
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