DateTime-> format（“ U”）不返回带有时区信息的值

Question

In PHP 5.2, I'm using the following code to get a timestamp from a DateTime object.

$dateTime = new DateTime("now", new DateTimeZone("America/Los_Angeles") );

echo $dateTime->format("U");

the problem is that format("U") simply returns server timestamp, which is UTC.

How do I make it to return a timestamp from Pacific Time Zone (Los Angeles) ?

Answer 1

您的时间戳概念不正确，时间戳与时区无关 ，它的定义是自1970年1月1日午夜协调世界时（UTC）起经过的秒数 。

Answer 2

Try setting timezone at top of PHP script. I think timestamps are always UTC. Use date() function to format it into what you need.

    // set timezone to pacific time
    date_default_timezone_set('America/Los_Angeles');