Historical clue formulations

• Soph., jr. and sr. — 2026-05-04
• Decade makeup: Abbr. — 2026-03-31
• Many, many mos. — 2025-10-05
• Mos. on end — 2025-08-19
• Junior and senior: Abbr. — 2025-04-27
• 12-mo. periods — 2025-04-21
• Calendar spans: Abbr. — 2025-02-10
• Jr. and sr. — 2023-09-17
• Times of one's life: Abbr. — 2022-12-04
• 2019, 2020 and 2021: Abbr. — 2021-06-22
• Jr. and sr. — 2021-05-20
• Alumni divs. — 2021-03-18
• '21, '22, etc. — 2021-03-05
• Calendar spans: Abbr. — 2020-08-16
• Info next to alumni names, maybe: Abbr. — 2020-01-11
• Jr. and sr. — 2019-12-04
• Slices of life: Abbr. — 2019-12-01
• Sch. divisions — 2019-05-04
• Extended warranty fig. — 2019-03-30
• 100 in a century: Abbr. — 2018-10-29
• Jr. and sr. — 2018-07-14
• Soph. and jr. — 2018-02-26
• What mos. and mos. add up to — 2018-02-18
• '17 and '18 — 2017-06-04
• 1000, 1500 and 2000: Abbr. — 2016-10-30
• Alumni data: Abbr. — 2016-02-20
• 19-Across units: Abbr. — 2015-01-31
• Soph. and jr. — 2014-11-17
• Spas that last 52 wks. — 2014-08-23
• Brief letter sign-off — 2013-10-27
• 12-mo. periods — 2013-07-08
• Abbr. before "truly" — 2013-06-19
• Calendar spans: Abbr. — 2013-01-21
• Soph., jr. and sr. — 2012-02-21
• Earth cycles: Abbr. — 2012-02-19
• Soph. and jr. — 2011-06-05
• Soph. and jr. — 2011-03-01
• Information on wine bottles: Abbr. — 2010-10-16
• Decade parts: Abbr. — 2010-10-01
• Sports seasons: Abbr. — 2010-06-24
• Sentence units: Abbr. — 2010-05-06
• They make cents. — 2010-02-19
• Representation of 34-Down: Abbr. — 2009-10-23
• '09, '10, etc. — 2009-09-24
• '08 and '12 — 2009-01-18
• Mos. and mos. — 2008-09-09
• Mos. and mos. — 2008-03-26
• '04, '08 and others — 2008-01-17
• Many, many mos. — 2008-01-13
• Cen. parts — 2007-12-30