ConFoo Montreal 2017 Calling for Papers

DateTime::getTimestamp

DateTimeImmutable::getTimestamp

DateTimeInterface::getTimestamp

date_timestamp_get

(PHP 5 >= 5.3.0, PHP 7)

DateTime::getTimestamp -- DateTimeImmutable::getTimestamp -- DateTimeInterface::getTimestamp -- date_timestamp_getGets the Unix timestamp

Description

Object oriented style

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

Procedural style

Gets the Unix timestamp.

Parameters

This function has no parameters.

Return Values

Returns the Unix timestamp representing the date.

Examples

Example #1 DateTime::getTimestamp() example

Object oriented style

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

Procedural style

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

The above examples will output something similar to:

1272509157

Notes

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

See Also

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User Contributed Notes 4 notes

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26
Justin Heesemann
6 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
11
heiccih at gmail dot com
2 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
3
mindplay.dk
2 months 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
-3
miguelmuscat93 at gmail dot com
4 months 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)
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