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The DateTimeInterface interface

Contents

(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.

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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 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 $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 )
}

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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::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)

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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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Document created the 30/01/2003, last modified the 26/10/2018
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References

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