PHP DateTime 时差仅在 UTC 时区中正确？

Question

谁能解释一下我的以下行为：

$end = new DateTime("2015-03-01", new DateTimeZone("Europe/Berlin"));
$start = new DateTime("2015-02-01", new DateTimeZone("Europe/Berlin"));
$diff = $start->diff($end);
//result: DateInterval Object ( [y] => 0 [m] => 0 [d] => 28 [h] => 0 [i] => 0 [s] => 0 [invert] => 0 [days] => 28 )

如果我不使用时区或 Europe/Berlin 我会得到错误的时差。 28 天确实是正确的，但在这种情况下是一个月。

$end = new DateTime("2015-03-01", new DateTimeZone("UTC"));
$start = new DateTime("2015-02-01", new DateTimeZone("UTC"));
$diff = $start->diff($end);
//result: DateInterval Object ( [y] => 0 [m] => 1 [d] => 0 [h] => 0 [i] =>; 0 [s] => 0 [invert] => 0 [days] => 28 )

UTC 有效

$end = new DateTime("2015-04-01", new DateTimeZone("Europe/Berlin"));
$start = new DateTime("2015-03-01", new DateTimeZone("Europe/Berlin"));
$diff = $start->diff($end);
//result: DateInterval Object ( [y] => 0 [m] => 1 [d] => 3 [h] => 0 [i] => 0 [s] => 0 [invert] => 0 [days] => 31 )

1 个月零 3 天？！？二月，你在这儿受惊了吗？

$end = new DateTime("2015-04-01", new DateTimeZone("UTC"));
$start = new DateTime("2015-03-01", new DateTimeZone("UTC"));
$diff = $start->diff($end);
//result: DateInterval Object ( [y] => 0 [m] => 1 [d] => 0 [h] => 0 [i] =>; 0 [s] => 0 [invert] => 0 [days] => 31 )

31 天 = 1 个月，UTC 是正确的

$end = new DateTime("2015-05-01", new DateTimeZone("Europe/Berlin"));
$start = new DateTime("2015-04-01", new DateTimeZone("Europe/Berlin"));
$diff = $start->diff($end);
//result: DateInterval Object ( [y] => 0 [m] => 0 [d] => 30 [h] => 0 [i] => 0 [s] => 0 [invert] => 0 [days] => 30 )

欧洲30天不也是一个月吗？

$end = new DateTime("2015-05-01", new DateTimeZone("UTC"));
$start = new DateTime("2015-04-01", new DateTimeZone("UTC"));
$diff = $start->diff($end);
//result: DateInterval Object ( [y] => 0 [m] => 1 [d] => 0 [h] => 0 [i] =>; 0 [s] => 0 [invert] => 0 [days] => 30 )

UTC 正确

$end = new DateTime("2015-06-01", new DateTimeZone("Europe/Berlin"));
$start = new DateTime("2015-05-01", new DateTimeZone("Europe/Berlin"));
$diff = $start->diff($end);
//result: DateInterval Object ( [y] => 0 [m] => 1 [d] => 1 [h] => 0 [i] => 0 [s] => 0 [invert] => 0 [days] => 31 )

又是31天，正确的是一个月，但为什么+1天？

$end = new DateTime("2015-06-01", new DateTimeZone("UTC"));
$start = new DateTime("2015-05-01", new DateTimeZone("UTC"));
$diff = $start->diff($end);
//result: DateInterval Object ( [y] => 0 [m] => 1 [d] => 0 [h] => 0 [i] =>; 0 [s] => 0 [invert] => 0 [days] => 31 )

UTC 仍然正确

我不明白。感谢您的帮助。

Answer 1

我相信您遇到了一个已知错误。

参见：

PHP::Bug #52480 Incorrect difference using DateInterval

PHP DateTime 时差仅在 UTC 时区中正确？

PHP DateTime Timedifference only correct in UTC Timezone?

php

timezone

datetime