PHP - 奇怪的时区偏移

发布于 2024-10-07 16:08:09 字数 821 浏览 5 评论 0原文

我遇到了一个我无法理解的愚蠢问题。为什么下面这段代码：

public function getFormattedOffsetFrom($refTimezoneId = 'Europe/Paris', $format = 'G\hi') {
    $timestamp = time();
    $reference = new DateTime('@'.$timestamp);
    $referenceTimeZone = new DateTimeZone($refTimezoneId);
    $reference->setTimezone($referenceTimeZone);
    $datetime = new DateTime('@'.$timestamp);
    $datetime->setTimezone($this->timezone);
    $offset = $this->timezone->getOffset($datetime) - $referenceTimeZone->getOffset($reference);
    $prefix = '+';
    if($offset < 0) {
        $prefix = '-';
        $offset = abs($offset);
    }
    return $prefix.date($format, $offset);
}

其中 $this->timezone 是位于欧洲/马德里的 DateTimeZone 实例，在未指定参数时生成 +1h00 ????

巴黎和马德里没有时间偏移。我只是不明白。

非常感谢您的帮助！！！！弗洛朗

原文

I'm encountering a stupid problem which I just cannot understand.
How come that following piece of code:

public function getFormattedOffsetFrom($refTimezoneId = 'Europe/Paris', $format = 'G\hi') {
    $timestamp = time();
    $reference = new DateTime('@'.$timestamp);
    $referenceTimeZone = new DateTimeZone($refTimezoneId);
    $reference->setTimezone($referenceTimeZone);
    $datetime = new DateTime('@'.$timestamp);
    $datetime->setTimezone($this->timezone);
    $offset = $this->timezone->getOffset($datetime) - $referenceTimeZone->getOffset($reference);
    $prefix = '+';
    if($offset < 0) {
        $prefix = '-';
        $offset = abs($offset);
    }
    return $prefix.date($format, $offset);
}

where $this->timezone is an instance of DateTimeZone positioned in Europe/Madrid, produces +1h00 when no args are specified ????

Paris and Madrid have no time offset. I just don't understand.

Thanks a lot for your help !!!!
Florent

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燕归巢 2024-10-14 16:08:09

~~为什么应该是0？西班牙和法国都使用 GMT+1 作为时区。~~

http:// en.wikipedia.org/wiki/File:Time_zones_of_Europe.svg

问题是您正在尝试使用函数 date() 格式化以秒为单位保存时差的 $offset，它需要时间戳作为第二个参数。如果 $offset == 0 date 函数将其识别为 1970-01-01 00:00:00 GMT，那么在您的时区中将是 1970-01-01 01:00:00 GMT+1，并且您正在使用格式返回小时和分钟，因此这就是您将 +1 作为输出的原因。

您必须手动设置该时间差的格式，如下所示：

$offsetH = floor( $offset / 3600 ); //full hours
$offsetM = floor(($offset - $offsetH) / 60 ); //full minutes

return sprintf("%s%sh%02s",$prefix,$offsetH,$offsetM) ;

~~Why should be 0 ? Both Spain and France are using GMT+1 as time zone.~~

http://en.wikipedia.org/wiki/File:Time_zones_of_Europe.svg

The problem is that you are trying to format $offset that holds time difference in seconds, with function date(), which expects timestamp as second parameter. If the $offset == 0 date function recognizes it as 1970-01-01 00:00:00 GMT, so in your timezone it will be 1970-01-01 01:00:00 GMT+1, and you are using format to return hours and minutes so that is why you have +1 as output.

You have to manually format this time difference like this:

$offsetH = floor( $offset / 3600 ); //full hours
$offsetM = floor(($offset - $offsetH) / 60 ); //full minutes

return sprintf("%s%sh%02s",$prefix,$offsetH,$offsetM) ;

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