(PHP 5 >= 5.2.0, PHP 7)
DateTime::modify -- date_modify — Alters the timestamp
Object oriented style
public DateTime::modify ( string $modifier ) : DateTime|false
Procedural style
date_modify ( DateTime $object , string $modifier ) : DateTime|false
Alter the timestamp of a DateTime object by incrementing or decrementing in a format accepted by DateTimeImmutable::__construct().
object
Procedural style only: A DateTime object returned by date_create(). The function modifies this object.
modifier
A date/time string. Valid formats are explained in Date and Time Formats.
Returns the DateTime object for method chaining or false
on failure.
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
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https://www.php.net/manual/en/datetime.modify.php