The DateTimeInterface interface

(PHP 5 >= 5.5.0, PHP 7)

Introduction

DateTimeInterface is meant so that both DateTime and DateTimeImmutable can be type hinted for. It is not possible to implement this interface with userland classes.

Class synopsis

DateTimeInterface {
/* Constants */
const string ATOM = "Y-m-d\TH:i:sP" ;
const string COOKIE = "l, d-M-Y H:i:s T" ;
const string ISO8601 = "Y-m-d\TH:i:sO" ;
const string RFC822 = "D, d M y H:i:s O" ;
const string RFC850 = "l, d-M-y H:i:s T" ;
const string RFC1036 = "D, d M y H:i:s O" ;
const string RFC1123 = "D, d M Y H:i:s O" ;
const string RFC7231 = "D, d M Y H:i:s \G\M\T" ;
const string RFC2822 = "D, d M Y H:i:s O" ;
const string RFC3339 = "Y-m-d\TH:i:sP" ;
const string RFC3339_EXTENDED = "Y-m-d\TH:i:s.vP" ;
const string RSS = "D, d M Y H:i:s O" ;
const string W3C = "Y-m-d\TH:i:sP" ;
/* Methods */
public diff ( DateTimeInterface $targetObject [, bool $absolute = FALSE ] ) : DateInterval
public format ( string $format ) : string
public getOffset ( void ) : int
public getTimestamp ( void ) : int
public getTimezone ( void ) : DateTimeZone
public __wakeup ( void )
}

Predefined Constants

DateTimeInterface::ATOM
DATE_ATOM
Atom (example: 2005-08-15T15:52:01+00:00)
DateTimeInterface::COOKIE
DATE_COOKIE
HTTP Cookies (example: Monday, 15-Aug-2005 15:52:01 UTC)
DateTimeInterface::ISO8601
DATE_ISO8601
ISO-8601 (example: 2005-08-15T15:52:01+0000)

Note: This format is not compatible with ISO-8601, but is left this way for backward compatibility reasons. Use DateTime::ATOM or DATE_ATOM for compatibility with ISO-8601 instead.

DateTimeInterface::RFC822
DATE_RFC822
RFC 822 (example: Mon, 15 Aug 05 15:52:01 +0000)
DateTimeInterface::RFC850
DATE_RFC850
RFC 850 (example: Monday, 15-Aug-05 15:52:01 UTC)
DateTimeInterface::RFC1036
DATE_RFC1036
RFC 1036 (example: Mon, 15 Aug 05 15:52:01 +0000)
DateTimeInterface::RFC1123
DATE_RFC1123
RFC 1123 (example: Mon, 15 Aug 2005 15:52:01 +0000)
DateTimeInterface::RFC7231
DATE_RFC7231
RFC 7231 (since PHP 7.0.19 and 7.1.5) (example: Sat, 30 Apr 2016 17:52:13 GMT)
DateTimeInterface::RFC2822
DATE_RFC2822
RFC 2822 (example: Mon, 15 Aug 2005 15:52:01 +0000)
DateTimeInterface::RFC3339
DATE_RFC3339
Same as DATE_ATOM (since PHP 5.1.3)
DateTimeInterface::RFC3339_EXTENDED
DATE_RFC3339_EXTENDED
RFC 3339 EXTENDED format (since PHP 7.0.0) (example: 2005-08-15T15:52:01.000+00:00)
DateTimeInterface::RSS
DATE_RSS
RSS (example: Mon, 15 Aug 2005 15:52:01 +0000)
DateTimeInterface::W3C
DATE_W3C
World Wide Web Consortium (example: 2005-08-15T15:52:01+00:00)

Changelog

Version Description
7.2.0 The class constants of DateTime are now defined on DateTimeInterface.
5.5.8 Trying to implement DateTimeInterface raises a fatal error now. Formerly implementing the interface didn't raise an error, but the behavior was erroneous.

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