DateTime::getTimestamp

DateTimeImmutable::getTimestamp

DateTimeInterface::getTimestamp

date_timestamp_get

(PHP 5 >= 5.3.0, PHP 7)

DateTime::getTimestamp -- DateTimeImmutable::getTimestamp -- DateTimeInterface::getTimestamp -- date_timestamp_get — Gets the Unix timestamp

说明

面向对象风格

public DateTime::getTimestamp ( void ) : int

public DateTimeImmutable::getTimestamp ( void ) : int

public DateTimeInterface::getTimestamp ( void ) : int

过程化风格

date_timestamp_get ( DateTimeInterface $object ) : int

Gets the Unix timestamp.

参数

此函数没有参数。

返回值

Returns the Unix timestamp representing the date.

范例

Example #1 DateTime::getTimestamp() example

面向对象风格


<?php
$date = new DateTime();
echo $date->getTimestamp();
?>

过程化风格


<?php
$date = date_create();
echo date_timestamp_get($date);
?>

以上例程的输出类似于：

1272509157

注释

Using U as the parameter to DateTime::format() is an alternative when using PHP 5.2.

参见

DateTime::setTimestamp() - 以 Unix 时间戳的方式设置 DateTime 对象
DateTime::format() - Returns date formatted according to given format

User Contributed Notes

heiccih at gmail dot com 10-Mar-2014 08:11


In 32-bit system the unix timestamp will overflow if the date goes beyond year 2038 and this method will return false. In 64-bit systems this function will still work as intended. For more information please see http://en.wikipedia.org/wiki/Year_2038_problem.

Justin Heesemann 11-Jun-2010 02:57


Note that for dates before the unix epoch getTimestamp() will return false, whereas format("U") will return a negative number.



<?php

$date = new DateTime("1899-12-31");

// "-2209078800"

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

// false

echo $date->getTimestamp();

?>