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date_add

Description

The date_add of Date / Time for PHP adds an amount of days, months, years, hours, minutes and seconds to a DateTime object.

Syntax

date_add(
    DateTime $object,
    DateInterval $interval
): DateTime

Parameters

object

A DateTime object returned by date_create(). The function modifies this object.

interval

A DateInterval object

Return

Returns the modified DateTime object for method chaining.

Examples

1 · object interval

<?

$object = date_create();
$interval = date_interval_create_from_date_string("1 year 1 month 1 week 1 day 1 hour 1 minute 1 second");

date_add($object, $interval);

print_r($object);

DateTime Object
(
    [date] => 2027-05-24 22:27:09.542063
    [timezone_type] => 3
    [timezone] => UTC
)

2 · return

<?

$object = date_create();
$interval = date_interval_create_from_date_string("1 year 1 month 1 week 1 day 1 hour 1 minute 1 second");

$return = date_add($object, $interval);

print_r($return);

DateTime Object
(
    [date] => 2027-05-24 22:27:09.661574
    [timezone_type] => 3
    [timezone] => UTC
)

3 · date_format

<?

$format = "Y-m-d h:i:s";

$object = date_create();
$interval = date_interval_create_from_date_string("1 year");
date_add($object, $interval);
echo date_format($object, $format) . PHP_EOL;

$object = date_create();
$interval = date_interval_create_from_date_string("1 month");
date_add($object, $interval);
echo date_format($object, $format) . PHP_EOL;

$object = date_create();
$interval = date_interval_create_from_date_string("1 week");
date_add($object, $interval);
echo date_format($object, $format) . PHP_EOL;

$object = date_create();
$interval = date_interval_create_from_date_string("1 day");
date_add($object, $interval);
echo date_format($object, $format) . PHP_EOL;

$object = date_create();
$interval = date_interval_create_from_date_string("1 hour");
date_add($object, $interval);
echo date_format($object, $format) . PHP_EOL;

$object = date_create();
$interval = date_interval_create_from_date_string("1 minute");
date_add($object, $interval);
echo date_format($object, $format) . PHP_EOL;

$object = date_create();
$interval = date_interval_create_from_date_string("1 second");
date_add($object, $interval);
echo date_format($object, $format);

2027-04-16 09:26:08
2026-05-16 09:26:08
2026-04-23 09:26:08
2026-04-17 09:26:08
2026-04-16 10:26:08
2026-04-16 09:27:08
2026-04-16 09:26:09