Date formats

Date format across fsf.org and gnu.org are inconsistent.

• YYYY-MM-DD h?:m?:i? (ISO 8601)
  • http://lists.gnu.org/archive/html/ - 2008-10-20 14:12:37 -0400
• YYYY-MM-DD h?:m? AM/PM
  • http://www.fsf.org/about/ - "Last modified 2008-04-28 11:42 AM" (plone?)
• YYYY/MM/DD
  • http://www.gnu.org/ - Last Updated: $Date: 2008/10/15 20:49:51 $
• D MMM YYYY
  • http://groups.fsf.org - This page was last modified 16:01, 7 October 2008. (mediawiki)