The return value is the difference, in milliseconds, between UTC and local time. Note that this means that the offset is positive if the local timezone is behind UTC and negative if it is ahead.
(PHP 5 >= 5.5.0, PHP 7, PECL >= 3.0.0a1)
IntlTimeZone::getRawOffset — Get the raw GMT offset (before taking daylight savings time into account
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此函数没有参数。
The return value is the difference, in milliseconds, between UTC and local time. Note that this means that the offset is positive if the local timezone is behind UTC and negative if it is ahead.