Thread:Project:Support desk/How to change format of lastmod's date/time/reply (3)

Umm, that's not really that configurable. Basically the choices are controlled by $datePreferences, with the definition of the choices in the $dateFormats array in languages/messages/MessagesEn.php Basically, the letter H symbolize 24 hour, and the symbole g would symbolize 12 hour per Help:Extension:ParserFunctions