The DateTimeImmutable class

Introduction

(PHP 5 >= 5.5.0, PHP 7)

Representation of date and time.

Class synopsis

DateTimeImmutable implements DateTimeInterface {
/* Inherited constants */
const string DateTimeInterface::ATOM = "Y-m-d\TH:i:sP" ;
const string DateTimeInterface::COOKIE = "l, d-M-Y H:i:s T" ;
const string DateTimeInterface::ISO8601 = "Y-m-d\TH:i:sO" ;
const string DateTimeInterface::RFC822 = "D, d M y H:i:s O" ;
const string DateTimeInterface::RFC850 = "l, d-M-y H:i:s T" ;
const string DateTimeInterface::RFC1036 = "D, d M y H:i:s O" ;
const string DateTimeInterface::RFC1123 = "D, d M Y H:i:s O" ;
const string DateTimeInterface::RFC7231 = "D, d M Y H:i:s \G\M\T" ;
const string DateTimeInterface::RFC2822 = "D, d M Y H:i:s O" ;
const string DateTimeInterface::RFC3339 = "Y-m-d\TH:i:sP" ;
const string DateTimeInterface::RFC3339_EXTENDED = "Y-m-d\TH:i:s.vP" ;
const string DateTimeInterface::RSS = "D, d M Y H:i:s O" ;
const string DateTimeInterface::W3C = "Y-m-d\TH:i:sP" ;
/* Methods */
public __construct ([ string $datetime = "now" [, DateTimeZone|null $timezone = null ]] )
public add ( DateInterval $interval ) : DateTimeImmutable
public static createFromFormat ( string $format , string $datetime [, DateTimeZone|null $timezone = null ] ) : DateTimeImmutable|false
public static createFromInterface ( DateTimeInterface $object ) : DateTimeImmutable
public static createFromMutable ( DateTime $object ) : DateTimeImmutable
public static getLastErrors ( ) : array|false
public modify ( string $modifier ) : DateTimeImmutable|false
public static __set_state ( array $array ) : DateTimeImmutable
public setDate ( int $year , int $month , int $day ) : DateTimeImmutable
public setISODate ( int $year , int $week [, int $dayOfWeek = 1 ] ) : DateTimeImmutable
public setTime ( int $hour , int $minute [, int $second = 0 [, int $microsecond = 0 ]] ) : DateTimeImmutable
public setTimestamp ( int $timestamp ) : DateTimeImmutable
public setTimezone ( DateTimeZone $timezone ) : DateTimeImmutable
public sub ( DateInterval $interval ) : DateTimeImmutable
public diff ( DateTimeInterface $targetObject [, bool $absolute = false ] ) : DateInterval|false
public format ( string $format ) : string
publicgetOffset ( ) : int
public getTimestamp ( ) : int
public getTimezone ( ) : DateTimeZone|false
public __wakeup ( ) : void
}

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https://www.php.net/manual/en/class.datetimeimmutable.php