Historical clue formulations

• Workweek inits. — 2024-06-02
• The five weekdays, for short — 2021-02-08
• Daily run, for short? — 2020-02-05
• Days of the week in a calendar heading — 2017-02-06
• Series often seen with S's on the ends — 2016-06-04
• Appt. book headings — 2009-04-17
• Workweek letters — 2005-07-05
• Abbr. on a class schedule — 2003-09-13
• Weekday sequence — 2002-07-05
• Calendar run — 2000-04-06