Leap-year bissextile placement (St Matthias 24 to 25 Feb) #333

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opened 2026-07-01 06:56:42 +00:00 by manlycucumber · 0 comments

manlycucumber commented

2026-07-01 06:56:42 +00:00

(Migrated from github.com)

Problem

Traditional reckoning doubles 24 February in a leap year (24 Feb "bis"), shifting St Matthias to 25 Feb (and St Gabriel of Our Lady of Sorrows, etc.).

Acceptance criteria

Bissextile handling shifts the affected sanctoral feasts in leap years
Invariant test

Notes

A classic correctness trap.

## Problem Traditional reckoning doubles 24 February in a leap year (24 Feb "bis"), shifting St Matthias to 25 Feb (and St Gabriel of Our Lady of Sorrows, etc.). ## Acceptance criteria - [ ] Bissextile handling shifts the affected sanctoral feasts in leap years - [ ] Invariant test ## Notes A classic correctness trap.