DateTimeImmutable::__construct()

date_create_immutable

(PHP 5 >= 5.5.0, PHP 7)

Returns new DateTimeImmutable object

说明

面向对象风格

过程化风格
date_create_immutable([string $time="now"[,DateTimeZone$timezone=NULL]]): DateTimeImmutable

LikeDateTime::__construct()but works withDateTimeImmutable.

As the type of the first parameter is string, we can assign a relative date for it.
Example:
<?php
$immutable = new DateTimeImmutable('-1 year', new DateTimeZone('Asia/ShangHai'));
echo $immutable->format('Y-m-d H:i:s');
?>
It looks like the parameter of function strtotime and is very helpful for us to get an immutable relative DateTime object.