您如何处理PHP中的时区差异计算? [英] How do you handle timezone difference calculation in PHP?

问题描述

有人告诉我，这种下面的计算用户本地时间的方法有时不起作用.用PHP做到这一点的最佳方法是什么?你怎么办?

I'm being told that this below method of calculating the user's local time is sometimes not working. What's the best way to do this in PHP? What do you do?

public function getTimeOffset ($time) {
    $this->_cacheTimeOffset();  
    if ($this->timeOffsetExecuted) {
        $d = date("O");
        $neg = 1;

        if (substr($d, 0, 1) == "-") {
            $neg = -1;
            $d = substr($d, 1);
        }

        $h = substr($d, 0, 2)*3600;
        $m = substr($d, 2)*60;

        return $time + ($neg * ($h + $m) * -1) + (($this->timeOffset + $this->getDstInUse()) * 3600);
    }
    return $time;
}

推荐答案

使用DateTime扩展名，例如 DateTimeZone :: getOffset

Use the DateTime extension, such as DateTime::getOffset,
or DateTimeZone::getOffset

某些国家/地区可能已执行多个时区更新，
此方法 DateTimeZone :: getTransitions 显示过渡历史记录

Some countries might have perform several timezone update,
this method DateTimeZone::getTransitions reveal the transition history

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