DateTimeZone::getOffset()

timezone_offset_get

(PHP 5 >= 5.2.0, PHP 7)

返回相对于 GMT 的时差。

说明

面向对象风格
publicDateTimeZone::getOffset(DateTime$datetime): int

过程化风格
timezone_offset_get(DateTimeZone$object,DateTime$datetime): int

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。

参数

$object

仅过程化风格：由timezone_open()返回的DateTimeZone对象。

$datetime

用来计算时差的日期对象。

返回值

成功时返回精确到秒的时差，或者在失败时返回FALSE。

范例

Example #1DateTimeZone::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;
?>