Historical clue formulations

• Days gone by, in bygone days — 2021-12-22
• Bygone days, old-style — 2020-10-13
• Bygone days, in days gone by — 2019-03-15
• Days of yore, in days of yore — 2017-12-22
• Ancient times, in ancient times — 2017-01-18
• Ancient times, in bygone days — 2016-06-18
• Ancient times, in ancient times — 2015-05-12
• Antiquity, in antiquity — 2015-01-20
• Antiquity, in the past — 2014-07-02
• Antiquity, in antiquity — 2013-02-15
• Antiquity, once — 2012-09-09
• Antiquity, once — 2012-07-29
• Days gone by, in days gone by — 2011-04-28
• Antiquity, poetically — 2011-02-27
• Antiquity, quaintly — 2010-10-24
• Antiquity, in antiquity — 2009-12-04
• Days of yore, in days of yore — 2009-09-30
• Antiquity, quaintly — 2007-04-22
• Days of yore, in days of yore — 2004-12-10
• Days of yore — 2002-05-15
• Time long ago — 2001-01-12
• Antiquity, in antiquity — 2000-12-10
• Later years, poetically — 2000-03-25
• Antiquity — 2000-01-30
• Round Table time — 2000-01-27
• Antiquity, once — 1999-10-03
• Antiquity, once — 1999-06-28
• Antiquity — 1999-05-02
• Antiquity, in antiquity — 1998-11-15
• Time of legend — 1998-04-17
• Days long gone by — 1998-02-21
• Antiquity — 1997-08-16
• Old age, in old times — 1997-06-10
• Years ago, years ago — 1996-09-01
• Antiquity, old-style — 1996-04-11
• Days of yore — 1995-04-26
• Old age, in old times — 1995-02-26
• Yore — 1994-12-14