DateTimeZone::getOffset

(PHP 5 >= 5.2.0)

DateTimeZone::getOffset — Returns the timezone offset from GMT

说明

面向对象风格

public int DateTimeZone::getOffset ( DateTime $datetime )

过程化风格

int timezone_offset_get ( DateTimeZone $object , DateTime $datetime )

This function returns the offset to GMT for the date/time specified in the datetime parameter. The GMT offset is calculated with the timezone information contained in the DateTimeZone object being used.

参数

object: 仅过程化风格：由 timezone_open() 返回的 DateTimeZone 对象。
datetime: DateTime that contains the date/time to compute the offset from.

返回值

Returns time zone offset in seconds on success 或者在失败时返回 FALSE.

范例

Example #1 DateTimeZone::getOffset() examples


<?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);
?>