(PHP 5 >= 5.2.0)
DateTime::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 strtotime().
Procedural style only: A DateTime object returned by date_create(). The function modifies this object.
A date/time string. Valid formats are explained in Date and Time Formats.
Returns the DateTime object for method chaining or FALSE on failure.
| Version | Description |
|---|---|
| 5.3.0 | Changed the return value on success from NULL to DateTime. |
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