Historical clue formulations

• Easy as pie — 2020-07-07
• "No sweat!" — 2013-06-09
• "That's easy" — 2008-04-18
• Like child's play — 2003-10-19
• Modest — 2002-08-25
• Clean-lined — 1997-11-23
• _____ Simon — 1994-09-25