Php.net 20131123T0619
Format strings taken from: http://us1.php.net/manual/en/function.date.php
http://www.php.net/ : "Y-m-d" (fine)
http://www.php.net/downloads.php "Y-m-d" + "d M Y"
http://www.php.net/ChangeLog-5.php "d-M-Y"
http://us3.php.net/migration55 '5 months ago' - no explicit date, nice to have, but please add explicit data so people can talk about the entry from day XY
http://us3.php.net/download-docs.php "d-M-Y"
http://www.php.net/archive/2013.php#id2013-10-10-1 in URL "Y-m-d", in page "d-M-Y"
http://talks.php.net/index.php/PHP+5 "M d, Y"
http://news.php.net/php.announce "D M j H:i:s Y"