DateTime
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DateTime::getTimestamp

date_timestamp_get

(PHP 5 >= 5.3.0)

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

说明

面向对象风格

public int DateTime::getTimestamp ( void )

过程化风格

int date_timestamp_get ( DateTime $object )

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
在线手册：中文 英文
PHP手册
PHP手册 - N: Gets the Unix timestamp

用户评论:

xwisdom at yahoo dot com (25-Aug-2010 10:13)

It's important to note that on 32-Bit systems getTimestamp() will return false for dates greater than 2038, while format("U") will return an unsigned integer

This will return false:

<?php
    $dt = new DateTime('2039/1/1');
    echo  $dt->getTimestamp();
?>

But this will return a value:

<?php
    $dt = new DateTime('2039/1/1');
    echo  $dt->format('U');
?>

Justin Heesemann (11-Jun-2010 10:57)

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();
?>