International PHP Conference 2019 - Spring Edition

DateTime::getTimestamp

DateTimeImmutable::getTimestamp

DateTimeInterface::getTimestamp

date_timestamp_get

(PHP 5 >= 5.3.0, PHP 7)

DateTime::getTimestamp -- DateTimeImmutable::getTimestamp -- DateTimeInterface::getTimestamp -- date_timestamp_getUnix タイムスタンプを取得する

説明

オブジェクト指向型

public int DateTime::getTimestamp ( void )
public int DateTimeImmutable::getTimestamp ( void )
public int DateTimeInterface::getTimestamp ( void )

手続き型

int date_timestamp_get ( DateTime $object )

Unix タイムスタンプを取得します。

パラメータ

この関数にはパラメータはありません。

返り値

その日付をあらわす Unix タイムスタンプを返します。

例1 DateTime::getTimestamp() の例

オブジェクト指向型

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

手続き型

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

上の例の出力は、 たとえば以下のようになります。

1272509157

注意

PHP 5.2 では、 DateTime::format() のパラメータに U を使えば同じことができます。

参考

add a note add a note

User Contributed Notes 4 notes

up
46
Justin Heesemann
8 years ago
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();
?>
up
21
heiccih at gmail dot com
4 years ago
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.
up
17
mindplay.dk
2 years ago
Miguel's comment is wrong - getTimeStamp() always returns a timestamp, this has nothing to do with timezones at all, as you can see below.

What's really happening in Miguel's example, is he is parsing the input dates in different timezones.

There is no such thing as "a timestamp relative to the timezone".

<?php

$d
= new DateTime('2016-03-11 11:00:00', new DateTimeZone('Europe/Rome'));

var_dump($d->getTimestamp()); // 1457690400

$d->setTimeZone(new DateTimeZone('America/New_York'));

var_dump($d->getTimestamp()); // 1457690400
up
-49
miguelmuscat93 at gmail dot com
2 years ago
Note that getTimestamp() does not return the UTC timestamp. It returns the timestamp relative to the set timezone, or the default server timezone. This also applies to dates in timezones with Daylight Savings.

<?php
// 11th March 2016 @ 11:00 UTC has timestamp: 1457694000
$d1 = new DateTime('2016-03-11 11:00:00', new DateTimeZone('Europe/Rome'));
$t1 = $d1->getTimestamp();

// 11th April 2016 @ 11:00 UTC has timestamp: 1460372400
$d2 = new DateTime('2016-04-11 11:00:00', new DateTimeZone('Europe/Rome'));
$t2 = $d2->getTimestamp();

printf("11 March: %d (diff = %d less)\n", $t1, 1457694000 - $t1);
printf("11 April: %d (diff = %d less)", $t2, 1460372400 - $t2);

// Prints:
// 1457690400 (diff = 3600)
// 1460365200 (diff = 7200)
To Top