(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 Oriented API only: If an invalid Date/Time string is passed, DateMalformedStringException is thrown.
| Version | Description |
|---|---|
| 8.3.0 |
DateTime::modify() now throws
DateMalformedStringException if an
invalid string is passed. Previously, it returned false,
and a warning was emitted.
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');The above example will output:
2006年12月13日
Procedural style
<?php
$date = date_create('2006-12-12');
date_modify($date, '+1 day');
echo date_format($date, 'Y-m-d');The above example will output:
2006年12月13日
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年01月31日 2001年03月03日
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年07月01日 00:00 2023年07月03日 00:00 2023年07月03日 17:30