Historical clue formulations

• Folding a fitted sheet, it may seem — 2026-09-16
• Test of will — 2026-06-11
• Difficult experience — 2024-04-09
• Nightmare — 2023-01-15
• Flying a commercial airline, often — 2022-12-07
• Opposite of a breeze — 2022-05-15
• Herculean undertaking — 2021-03-31
• Trying experience — 2020-03-24
• Harrowing experience — 2018-09-26
• Climbing Mount Everest, e.g. — 2017-10-01
• Tough slog — 2017-07-27
• Hell week, e.g. — 2017-04-16
• Traveling around the holidays, maybe — 2015-01-04
• Tough time — 2014-09-17
• Difficult experience — 2014-08-11
• Extended trial — 2013-12-21
• Experience you might want to forget — 2013-08-25
• Baptism by fire — 2013-02-01
• No walk in the park — 2012-06-10
• Test of one's mettle — 2008-11-17
• Tough time — 2007-11-13
• Terrible trial — 2005-10-11
• Tough time — 2005-07-25
• Tough row to hoe — 2003-12-07
• Trial by fire — 2003-10-27
• Trying experience — 2002-12-11
• Difficult experience — 2001-11-26
• Big test — 2001-10-28
• Boot camp, typically — 2001-08-11
• Baptism of fire — 2000-12-17
• Severe test — 1998-05-26
• Tough going — 1997-10-15
• Tough time — 1996-01-22
• Trial — 1994-07-02