DateTime::sub

date_sub

(PHP 5 >= 5.3.0)

DateTime::sub -- date_sub Subtracts an amount of days, months, years, hours, minutes and seconds from a DateTime object

Description

Object oriented style

public DateTime DateTime::sub ( DateInterval $interval )

Procedural style

DateTime date_sub ( DateTime $object , DateInterval $interval )

Subtracts the specified DateInterval object from the specified DateTime object.

Parameters

object

Procedural style only: A DateTime object returned by date_create(). The function modifies this object.

interval

A DateInterval object

Return Values

Returns the DateTime object for method chaining or FALSE on failure.

Examples

Example #1 DateTime::sub() example

Object oriented style

<?php
$date 
= new DateTime('2000-01-20');
$date->sub(new DateInterval('P10D'));
echo 
$date->format('Y-m-d') . "\n";
?>

Procedural style

<?php
$date 
date_create('2000-01-20');
date_sub($datedate_interval_create_from_date_string('10 days'));
echo 
date_format($date'Y-m-d');
?>

The above examples will output:

2000-01-10

Example #2 Further DateTime::sub() examples

<?php
$date 
= new DateTime('2000-01-20');
$date->sub(new DateInterval('PT10H30S'));
echo 
$date->format('Y-m-d H:i:s') . "\n";

$date = new DateTime('2000-01-20');
$date->sub(new DateInterval('P7Y5M4DT4H3M2S'));
echo 
$date->format('Y-m-d H:i:s') . "\n";
?>

The above example will output:

2000-01-19 13:59:30
1992-08-15 19:56:58

Example #3 Beware when subtracting months

<?php
$date 
= new DateTime('2001-04-30');
$interval = new DateInterval('P1M');

$date->sub($interval);
echo 
$date->format('Y-m-d') . "\n";

$date->sub($interval);
echo 
$date->format('Y-m-d') . "\n";
?>

The above example will output:

2001-03-30
2001-03-02

Notes

DateTime::modify() is an alternative when using PHP 5.2.

See Also

Коментарии

Be careful when subtracting a duration crossing a DST change, it can output a resulting date AFTER your base date.

// tested in 8.3.18, 7.4.33

// DST timezone shift is applied properly when setting time explicitely

echo (new DateTime('2025-03-30'))->setTimeZone(new DateTimeZone('Europe/Paris'))->setTime(1,59,0)->format('c').PHP_EOL;
echo (new DateTime('2025-03-30'))->setTimeZone(new DateTimeZone('Europe/Paris'))->setTime(2,0,0)->format('c').PHP_EOL;
echo (new DateTime('2025-03-30'))->setTimeZone(new DateTimeZone('Europe/Paris'))->setTime(2,1,0)->format('c').PHP_EOL;

// 2025-03-30T01:59:00+01:00 < correct
// 2025-03-30T03:00:00+02:00 < correct
// 2025-03-30T03:01:00+02:00 < correct

echo PHP_EOL;

// DST timezone shift is applied properly when addind a duration

$startDateTime = (new DateTime('2025-03-30'))->setTimeZone(new DateTimeZone('Europe/Paris'))->setTime(1,58,0);
echo $startDateTime->format('c').PHP_EOL;
$endDatetime = clone($startDateTime)->add(DateInterval::createFromDateString('4 minutes'));
echo $endDatetime->format('c').PHP_EOL;

// 2025-03-30T01:58:00+01:00 < correct
// 2025-03-30T03:02:00+02:00 < correct

echo PHP_EOL;

// DST timezone shift is applied improperly when subtracting a duration

$startDateTime = (new DateTime('2025-03-30'))->setTimeZone(new DateTimeZone('Europe/Paris'))->setTime(3,2,0);
echo $startDateTime->format('c').PHP_EOL;
$endDatetime = clone($startDateTime)->sub(DateInterval::createFromDateString('4 minutes'));
echo $endDatetime->format('c').PHP_EOL;

// 2025-03-30T03:02:00+02:00 < correct
// 2025-03-30T03:58:00+02:00 < incorrect !!!

echo PHP_EOL;

// DST timezone shift is still applied improperly when adding a negative duration

$startDateTime = (new DateTime('2025-03-30'))->setTimeZone(new DateTimeZone('Europe/Paris'))->setTime(3,2,0);
echo $startDateTime->format('c').PHP_EOL;
$endDatetime = clone($startDateTime)->add(DateInterval::createFromDateString('-4 minutes'));
echo $endDatetime->format('c').PHP_EOL;

// 2025-03-30T03:02:00+02:00 < correct
// 2025-03-30T03:58:00+02:00 < incorrect !!!
2025-03-27 15:56:52
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