小编典典

尽管gmdate函数可用。如果您使用的是PHP

5.2或更高版本，请考虑使用DateTime对象。

这是切换到GMT的代码

$date = new DateTime();

$date->setTimezone(new DateTimeZone('GMT'));

然后返回默认时区…

$date = new DateTime('2011-01-01', new DateTimeZone('GMT'));

$date->setTimezone(new DateTimeZone(date_default_timezone_get()));

使用DateTime对象可以像创建过程函数一样创建日期时间，只是保留对实例的引用。

例如

// Get a reference to Christmas of 2011, at lunch time.

$date = new DateTime('2011-12-25 13:00:00');

// Print the date for people to see, in whatever format we specify.

echo $date->format('D jS M y');

// Change the timezone to GMT.

$date->setTimezone(new DateTimeZone('GMT'));

// Now print the date/time it would in the GMT timezone

// as opposed to the default timezone it was created with.

echo $date->format('Y-m-d H:i:s');

// Just to show of some more, get the previous Sunday

$date->modify('previous Sunday');

您可以使用很多功能，这些功能比过程功能更具可读性。

从时区转换为GMT的明确示例

$melbourne = new DateTimeZone('Australia/Melbourne');

$gmt = new DateTimeZone('GMT');

$date = new DateTime('2011-12-25 00:00:00', $melbourne);

$date->setTimezone($gmt);

echo $date->format('Y-m-d H:i:s');

// Output: 2011-12-24 13:00:00

// At midnight on Christmas eve in Melbourne it will be 1pm on Christmas Eve GMT.

echo '
';

// Convert it back to Australia/Melbourne

$date->setTimezone($melbourne);

echo $date->format('Y-m-d H:i:s');

使用您的亚洲/加尔各答前往美国/纽约

date_default_timezone_set('Asia/Kolkata');

$date = new DateTime('2011-03-28 13:00:00');

$date->setTimezone(new DateTimeZone('America/New_York'));

echo $date->format("Y-m-d H:i:s");

//Outputs: 2011-03-28 03:30:00

2020-05-29