jayvdb added a comment. Some different algorithms can be found here http://code.activestate.com/recipes/577274-subtract-or-add-a-month-to-a-dat… TASK DETAIL https://phabricator.wikimedia.org/T73124 REPLY HANDLER ACTIONS Reply to comment or attach files, or !close, !claim, !unsubscribe or !assign <username>. To: jayvdb Cc: pywikipedia-bugs, Legoktm, jayvdb, XZise, Multichill, Xqt