# The DateTimeImmutable class

(PHP 5 >= 5.5.0, PHP 7)

## Introduction

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

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

## Table of Contents

- DateTimeImmutable::add — Adds an amount of days, months, years, hours, minutes and seconds
- DateTimeImmutable::__construct — Returns new DateTimeImmutable object
- DateTimeImmutable::createFromFormat — Parses a time string according to a specified format
- DateTimeImmutable::createFromMutable — Returns new DateTimeImmutable object encapsulating the given DateTime object
- DateTimeImmutable::getLastErrors — Returns the warnings and errors
- DateTimeImmutable::modify — Creates a new object with modified timestamp
- DateTimeImmutable::__set_state — The __set_state handler
- DateTimeImmutable::setDate — Sets the date
- DateTimeImmutable::setISODate — Sets the ISO date
- DateTimeImmutable::setTime — Sets the time
- DateTimeImmutable::setTimestamp — Sets the date and time based on a Unix timestamp
- DateTimeImmutable::setTimezone — Sets the time zone
- DateTimeImmutable::sub — Subtracts an amount of days, months, years, hours, minutes and seconds