(PHP 5 >= 5.5.0)
DateTimeImmutable::__construct -- date_create_immutable — Returns new DateTimeImmutable object
面向对象风格
$time
= "now"
[, DateTimeZone $timezone
= NULL
]] )过程化风格
$time
= "now"
[, DateTimeZone $timezone
= NULL
]] )Like DateTime::__construct() but works with DateTimeImmutable.