DateTime::setTime

date_time_set

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

DateTime::setTime -- date_time_set — 设置时间

说明

面向对象风格

public DateTime::setTime(
    int $hour,
    int $minute,
    int $second = 0,
    int $microsecond = 0
): DateTime

过程化风格

date_time_set(
    DateTime $object,
    int $hour,
    int $minute,
    int $second = 0,
    int $microsecond = 0
): DateTime

将 DateTime 的当前时间重置为不同的时间。

跟 DateTimeImmutable::setTime() 一样，但适用于 DateTime。

过程化版本将 DateTime 对象作为第一个参数。

参数

object: 仅过程化风格：由 date_create() 返回的 DateTime 类型的对象。此函数会修改这个对象。
hour: 时间中的小时。
minute: 时间中的分钟。
second: 时间中的秒。
microsecond: 时间中的微秒。

返回值

返回方法链修改后的 DateTime 对象。

更新日志

版本	说明
8.1.0	The behaviour with double existing hours (during the fall-back DST transition) changed. Previously PHP would pick the second occurrence (after the DST transition), instead of the first occurrence (before DST transition).
7.1.0	新增 `microsecond` 参数。

参见

DateTimeImmutable::setTime() - Sets the time

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User Contributed Notes 2 notes

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fabien dot villepinte at gmail dot com ¶

7 years ago


A 4th parameter has been added in PHP-7.1 : microseconds

See the notes here:
https://github.com/php/php-src/blob/e33ec61f9c1baa73bfe1b03b8c48a824ab2a867e/UPGRADING#L285

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php-notes at allenjb dot me dot uk ¶

3 years ago


Be aware that setTime can cause a change in the timezone offset: https://3v4l.org/MqYN9

(The time 01:05:00 exists twice on this day in Europe/London due to DST change - once in +01:00 and then again at +00:00)

$tzUK = new \DateTimeZone("Europe/London");
$tzUtc = new \DateTimeZone("UTC");
$dt = \DateTimeImmutable::createFromFormat("!Y-m-d H:i:s", "2020-10-25 00:05:00", $tzUtc);
$dt = DateTime::createFromFormat('U', $dt->format('U'));

print $dt->format(\DateTime::RFC3339 ." e") ."\n";

$dt->setTimeZone($tzUK);

print $dt->format(\DateTime::RFC3339 ." e") ."\n";

$dt->setTime((int) $dt->format('H'), (int) $dt->format('i'), 0);

print $dt->format(\DateTime::RFC3339 ." e") ."\n";

Will output:
2020-10-25T00:05:00+00:00 +00:00
2020-10-25T01:05:00+01:00 Europe/London
2020-10-25T01:05:00+00:00 Europe/London

Verified on PHP 5.3 thru 8.0 (latest at time of posting)

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