Historical clue formulations

• Part of MGM's motto — 2016-10-14
• Ex ___ (as a favor, in law) — 2016-01-09
• The "g" in e.g. — 2013-09-15
• The "g" in e.g. — 2004-07-11
• ___ Dei — 2001-06-24
• Middle of M-G-M's motto — 1998-03-27