Historical clue formulations

• Crossed the sill — 2016-02-21
• Input — 2014-01-19
• In the log, say — 2013-04-27
• Pierced — 2011-05-27
• In the database, say — 2010-03-05
• Registered for — 2009-06-05
• Logged — 2007-08-23
• Popped in — 2006-04-28
• Put down — 2005-10-07
• Broke in, e.g. — 2005-09-30
• Became involved in — 2004-12-24
• Typed in — 2004-05-29
• Logged — 2002-08-25
• Walked in — 2002-03-04
• Came in — 2001-12-31
• Penetrated — 2001-01-24
• Made a record of — 2000-04-23
• Recorded — 1998-03-07
• Signed up for — 1997-03-11
• Went in — 1994-11-07
• Joined — 1994-08-27