Historical clue formulations

• Ramadan, e.g. — 2026-09-11
• Any of 12 represented in this puzzle's shaded squares — 2022-09-27
• Slash preceder — 2021-03-12
• Leasing unit — 2019-11-01
• Rental unit, often — 2019-01-18
• What the "1" of "1/2" represents — 2016-08-28
• Common pay period — 2016-02-21
• May, for one — 2015-09-03
• One was renamed in Caesar's honor — 2014-12-09
• Calendar page — 2014-08-04
• Billing cycle, often — 2011-12-28
• The "1" in 1/2, e.g. — 2011-07-22
• One of a dozen — 2011-06-05
• The 6 in 6/8/10, e.g. — 2010-06-08
• Shevat or Sivan — 2010-01-17
• See 55-Across — 2010-01-10
• The 4 in 4/6, e.g. — 2007-04-06
• Billing cycle — 2004-05-07
• Rental period — 2002-08-15
• Billing period — 2001-06-22
• Billing cycle, often — 1998-10-22
• Calendar page — 1997-11-20