module to parse and format W3CDTF datetime strings

 DateTime::Format::W3CDTF is a Perl module that understands the W3CDTF date
 and time format, an ISO 8601 profile. It has a full specification online at:
 <URL:http://www.w3.org/TR/NOTE-datetime>. This is the native date format for
 RSS 1.0.