Historical clue formulations

• Ab ___ (from the beginning) — 2012-10-17
• Ab ___ (from the start) — 2011-08-17
• Ab ___ (from the start) — 2008-12-05
• Ab ___ (from the start) — 2006-05-10
• Ab ___ (from the beginning) — 2005-04-08
• Ab ___ (from the beginning) — 1997-01-12