Date/Time
PHP Manual

The DateTimeImmutable class

(PHP 5 >= 5.5.0)

Introduction

This class behaves the same as DateTime except it never modifies itself but returns a new object instead.

Class synopsis

DateTimeImmutable implements DateTimeInterface {
/* Methods */
public __construct ([ string $time = "now" [, DateTimeZone $timezone = NULL ]] )
public DateTimeImmutable add ( DateInterval $interval )
public static DateTimeImmutable createFromFormat ( string $format , string $time [, DateTimeZone $timezone ] )
public static DateTimeImmutable createFromMutable ( DateTime $datetime )
public static array getLastErrors ( void )
public DateTimeImmutable modify ( string $modify )
public static DateTimeImmutable __set_state ( array $array )
public DateTimeImmutable setDate ( int $year , int $month , int $day )
public DateTimeImmutable setISODate ( int $year , int $week [, int $day = 1 ] )
public DateTimeImmutable setTime ( int $hour , int $minute [, int $second = 0 ] )
public DateTimeImmutable setTimestamp ( int $unixtimestamp )
public DateTimeImmutable setTimezone ( DateTimeZone $timezone )
public DateTimeImmutable sub ( DateInterval $interval )
public DateInterval diff ( DateTimeInterface $datetime2 [, bool $absolute = false ] )
public string format ( string $format )
public int getOffset ( void )
public int getTimestamp ( void )
public DateTimeZone getTimezone ( void )
public __wakeup ( void )
}

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Date/Time
PHP Manual