Php/docs/datetime.modify
DateTime::modify
date_modify
(PHP 5 >= 5.2.0, PHP 7)
DateTime::modify -- date_modify — Alters the timestamp
Description
Object oriented style
public DateTime::modify
( string $modifier
) : DateTime
Procedural style
date_modify
( DateTime $object
, string $modifier
) : DateTime
Alter the timestamp of a DateTime object by incrementing or decrementing in a format accepted by DateTimeImmutable::__construct().
Parameters
object- Procedural style only: A DateTime object returned by date_create(). The function modifies this object.
modifier- A date/time string. Valid formats are explained in Date and Time Formats.
Examples
Example #1 DateTime::modify() example
Object oriented style
<?php$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
See Also
- strtotime() - Parse about any English textual datetime description into a Unix timestamp
- DateTime::add() - Adds an amount of days, months, years, hours, minutes and seconds to a DateTime object
- DateTime::sub() - Subtracts an amount of days, months, years, hours, minutes and seconds from a DateTime object
- DateTime::setDate() - Sets the date
- DateTime::setISODate() - Sets the ISO date
- DateTime::setTime() - Sets the time
- DateTime::setTimestamp() - Sets the date and time based on an Unix timestamp
