On 2022-04-19, Barry <ba...@barrys-emacs.org> wrote: >> On 19 Apr 2022, at 19:38, Dennis Lee Bieber <wlfr...@ix.netcom.com> wrote: >> * I /think/ this is the year used for leap-day calculations, and >> why some leap centuries are skipped as it is really less than a >> quarter day per year, so eventually one gets to over-correcting >> by a day. > > Leap century is skip unless it’s a leap quadra century.
Indeed, which is why "leap=not year & 3" works for years in range(1901, 2100). Which I have found useful before when programming in an assembly language that has no division operation ;-) -- https://mail.python.org/mailman/listinfo/python-list
