(PHP 5 >= 5.2.0, PHP 7)
DateTimeZone::getOffset -- timezone_offset_get — 返回相对于 GMT 的时差。
面向对象风格
过程化风格
该函数返回 datetime日期 相对于 GMT 的时差。 GMT 时差是通过 DateTimeZone 对象的时区信息计算出来的。
成功时返回精确到秒的时差， 或者在失败时返回 FALSE。
Example #1 DateTimeZone::getOffset() 例子
<?php
// Create two timezone objects, one for Taipei (Taiwan) and one for
// Tokyo (Japan)
$dateTimeZoneTaipei = new DateTimeZone("Asia/Taipei");
$dateTimeZoneJapan = new DateTimeZone("Asia/Tokyo");
// Create two DateTime objects that will contain the same Unix timestamp, but
// have different timezones attached to them.
$dateTimeTaipei = new DateTime("now", $dateTimeZoneTaipei);
$dateTimeJapan = new DateTime("now", $dateTimeZoneJapan);
// Calculate the GMT offset for the date/time contained in the $dateTimeTaipei
// object, but using the timezone rules as defined for Tokyo
// ($dateTimeZoneJapan).
$timeOffset = $dateTimeZoneJapan->getOffset($dateTimeTaipei);
// Should show int(32400) (for dates after Sat Sep 8 01:00:00 1951 JST).
var_dump($timeOffset);
?>
Procedural Style:
<?php
// Don't know where the server is or how its clock is set, so default to UTC
date_default_timezone_set( "UTC" );
// The client is in England where daylight savings may be in effect
$daylight_savings_offset_in_seconds = timezone_offset_get( timezone_open( "BST" ), new DateTime() );
// Do something useful with the number
echo date( "U" ) + $daylight_savings_offset_in_seconds;
?>