(PHP 5 >= 5.2.0, PHP 7, PHP 8)
DateTime::modify -- date_modify — Alters the timestamp
Object-oriented style
Procedural style
Alter the timestamp of a DateTime object by incrementing or decrementing in a format accepted by DateTimeImmutable::__construct().
objectProcedural style only: A DateTime object returned by date_create(). The function modifies this object.
modifierA date/time string. Valid formats are explained in Date and Time Formats.
Object Orientated API only: If an invalid Date/Time string is passed, DateMalformedStringException is thrown.
| Version | Description |
|---|---|
| 8.3.0 | Now throws DateMalformedStringException with DateTime::modify() if an invalid string is passed, instead of a warning. date_modify() has not been changed. |
Example #1 DateTime::modify() example
Object-oriented style
<?php
$date = new DateTime('2006-12-12');
$date->modify('+1 day');
echo $date->format('Y-m-d');
?>Procedural style
<?php
$date = date_create('2006-12-12');
date_modify($date, '+1 day');
echo date_format($date, 'Y-m-d');
?>The above examples will output:
2006-12-13
Example #2 Beware when adding or subtracting months
<?php
$date = new DateTime('2000-12-31');
$date->modify('+1 month');
echo $date->format('Y-m-d') . "\n";
$date->modify('+1 month');
echo $date->format('Y-m-d') . "\n";
?>The above example will output:
2001-01-31 2001-03-03
Example #3 All formats of Date and Time are supported
<?php
$date = new DateTime('2020-12-31');
$date->modify('July 1st, 2023');
echo $date->format('Y-m-d H:i') . "\n";
$date->modify('Monday next week');
echo $date->format('Y-m-d H:i') . "\n";
$date->modify('17:30');
echo $date->format('Y-m-d H:i') . "\n";
?>The above example will output:
2023-07-01 00:00 2023-07-03 00:00 2023-07-03 17:30