(PHP 5 >= 5.6.0, PHP 7)
DateTimeImmutable::createFromMutable — Returns new DateTimeImmutable object encapsulating the given DateTime object
public static DateTimeImmutable::createFromMutable ( DateTime $object ) : DateTimeImmutable
object
The mutable DateTime object that you want to convert to an immutable version. This object is not modified, but instead a new DateTimeImmutable object is created containing the same date time and timezone information.
Example #1 Creating an immutable date time object
<?php
$date = new DateTime("2014-06-20 11:45 Europe/London");
$immutable = DateTimeImmutable::createFromMutable( $date );
?> Returns a new DateTimeImmutable instance.
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https://www.php.net/manual/en/datetimeimmutable.createfrommutable.php