Constants for new date functions in PHP5 programs

PHP 5.1.1 defines the following constants to provide a standard date expression method that can be used in date format functions (for example, Date ()).

Date_atom (String)

atomic clock format (e.g.: 2005-08-15t15:52:01+00:00)

Date_cookie (String)

HTTP Cookies format (such as: Mon, Aug 15:52:01 UTC)

date_iso8601 (String)

ISO-8601 (eg: 2005-08-15t15:52:01+0000)

date_rfc822 (String)

RFC 822 (such as: Mon, Aug 15:52:01 UTC)

date_rfc850 (String)

RFC 850 (for example: Monday, 15-aug-05 15:52:01 UTC)

date_rfc1036 (String)

RFC 1036 (for example: Monday, 15-aug-05 15:52:01 UTC)

Date_rfc1123 (String)

RFC 1123 (such as: Mon, Aug 15:52:01 UTC)

date_rfc2822 (String)

RFC 2822 (such as: Mon, Aug 2005 15:52:01 +0000)

Date_rss (String)

RSS (such as: Mon, Aug 15:52:01 UTC)

DATE_W3C (String)

World Wide Web Consortium (such as: 2005-08-15t15:52:01+00:00)

For example, to output an RSS-Required date format, you can use the following code to simply implement:

echo Date (DATE_RSS);