(PHP 5 >= 5.5.0, PHP 7, PHP 8)
DateTimeImmutable::add — Returns a new object, with added amount of days, months, years, hours, minutes and seconds
Creates a new DateTimeImmutable object, and adds the specified DateInterval object to this, to represent the new value.
intervall
A DateInterval object
Returns a new DateTimeImmutable object with the modified data.
Example #1 DateTimeImmutable::add() example
Object-oriented style
<?php
$date
= new
DateTimeImmutable
(
'2000-01-01'
);
$newDate
=
$date
->
add
(new
DateInterval
(
'P10D'
));
echo
$newDate
->
format
(
'Y-m-d'
) .
"\n"
;
?>
Example #2 Further DateTimeImmutable::add() examples
<?php
$date
= new
DateTimeImmutable
(
'2000-01-01'
);
$newDate
=
$date
->
add
(new
DateInterval
(
'PT10H30S'
));
echo
$newDate
->
format
(
'Y-m-d H:i:s'
) .
"\n"
;
$date
= new
DateTimeImmutable
(
'2000-01-01'
);
$newDate
=
$date
->
add
(new
DateInterval
(
'P7Y5M4DT4H3M2S'
));
echo
$newDate
->
format
(
'Y-m-d H:i:s'
) .
"\n"
;
?>
The above example will output:
2000-01-01 10:00:30 2007-06-05 04:03:02
Example #3 Beware when adding months
<?php
$date
= new
DateTimeImmutable
(
'2000-12-31'
);
$interval
= new
DateInterval
(
'P1M'
);
$newDate1
=
$date
->
add
(
$interval
);
echo
$newDate1
->
format
(
'Y-m-d'
) .
"\n"
;
$newDate2
=
$newDate1
->
add
(
$interval
);
echo
$newDate2
->
format
(
'Y-m-d'
) .
"\n"
;
?>
The above example will output:
2001-01-31 2001-03-03