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A leap year check in three instructions

(hueffner.de)
434 points gnabgib | 1 comments | 15 May 25 21:57 UTC | HN request time: 0.212s | source
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usr1106 ◴[16 May 25 03:10 UTC] No.44001491[source]▶
Interesting. In one place the author argues: 0 is missing, but we already know...

The is no year 0, it goes 1 BC, 1 AD. So testing whether 0 is a leap year is moot.

replies(4): >>44001514 #>>44001606 #>>44001960 #>>44002001 #
1. JdeBP ◴[16 May 25 03:34 UTC] No.44001606[source]▶
Go back to the start of the article, and you'll find that using the proleptic Gregorian calendar with astronomical year numbering is a premise for the algorithm.

Without that design constraint, testing for leap years becomes locale-dependent and very complex indeed.