DateTimeImmutable::modify
(PHP 5 >= 5.5.0, PHP 7, PHP 8)
DateTimeImmutable::modify — Creates a new object with modified timestamp
Description
Creates a new DateTimeImmutable object with modified timestamp. The original object is not modified.
Parameters
-
modifier -
A date/time string. Valid formats are explained in Date and Time Formats.
Return Values
Returns a new modified DateTimeImmutable object or false on failure.
Examples
Example #1 DateTimeImmutable::modify() example
Object-oriented style
<?php
$date = new DateTimeImmutable('2006-12-12');
$newDate = $date->modify('+1 day');
echo $newDate->format('Y-m-d');
?>
The above examples will output:
2006-12-13
Example #2 Beware when adding or subtracting months
<?php
$date = new DateTimeImmutable('2000-12-31');
$newDate1 = $date->modify('+1 month');
echo $newDate1->format('Y-m-d') . "\n";
$newDate2 = $newDate1->modify('+1 month');
echo $newDate2->format('Y-m-d') . "\n";
?>
The above example will output:
2001-01-31 2001-03-03
See Also
- DateTimeImmutable::add() - Returns a new object, with added amount of days, months, years, hours, minutes and seconds
- DateTimeImmutable::sub() - Subtracts an amount of days, months, years, hours, minutes and seconds
- DateTimeImmutable::setDate() - Sets the date
- DateTimeImmutable::setISODate() - Sets the ISO date
- DateTimeImmutable::setTime() - Sets the time
- DateTimeImmutable::setTimestamp() - Sets the date and time based on a Unix timestamp
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