LEAPDAY
| Date | Clue |
|---|---|
| 2024-04-21 | Quadrennial occurrence |
| 2021-09-24 | Quadrennial bonus |
| 2021-02-08 | February 29 |
| 2016-02-29 | 2/29/16, e.g. ... or a hint to the circled squares in this puzzle |
| 2009-03-13 | March preceder, periodically |
| 2002-06-30 | Bissextile occurrence |
| 2002-01-07 | February 29 |