New constant of date function in PHP5 Program

The following constants are defined in PHP 5.1.1 to provide standard Expression Methods for date formats (such as date ()).

DATE_ATOM (string)

Atomic Clock format (for example, 2005-08-15T15: 52: 01 + 00: 00)

DATE_COOKIE (string)

HTTP cookie format (for example, Mon, 15 Aug 2005 15:52:01 UTC)

DATE_ISO8601 (string)

ISO-8601 (e.g.: 15t15: 52: 01 + 0000)

DATE_RFC822 (string)

RFC 822 (for example, Mon, 15 Aug 2005 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 (for example, Mon, 15 Aug 2005 15:52:01 UTC)

DATE_RFC2822 (string)

RFC 2822 (for example, Mon, 15 Aug 2005 15:52:01 + 0000)

DATE_RSS (string)

RSS (for example, Mon, 15 Aug 2005 15:52:01 UTC)

DATE_W3C (string)

World Wide Web Consortium (for example, 2005-08-15T15: 52: 01 + 00: 00)

For example, to output a date format required by RSS, you can simply implement it using the following code:

Echo date (DATE_RSS );