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public DateTimeZone::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; ?>