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  • 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;
    ?>