Hacker News Comments on
Calendrical Calculations
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Jun 09, 2017
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_jal on
Working with time in Postgres
Time, to me, is the canonical example of "things that people think should be easy, aren't". It has everything - complex, constantly changing "business" rules, exceptions generated essentially randomly by a shadowy cabal[1] nobody's ever heard of, "impossible" situations like the 11 days that never happened and other technically arbitrary calendar edits[2], multiple silly base conversions, really weird rules for picking certain dates[3], lots of opportunities for making fencepost errors, and lots of other things.Which leads me to my rule with time programming: Never fail to use a solid library, unless you're unfortunate enough to be writing one.
This[4] is a great, necessary but not sufficient book if you have to do that.
[1] https://en.wikipedia.org/wiki/International_Earth_Rotation_a...
[2] For example, https://en.wikipedia.org/wiki/Swedish_calendar
[3] https://en.wikipedia.org/wiki/Easter#Computations
[4] https://www.amazon.com/Calendrical-Calculations-Nachum-Dersh...
⬐ deepsunDon't even mention how to calculate number of weeks in a year! It's often needed in real world programming for business reports, yet Joda-time library still doesn't support weeks not starting on Monday (like USA-ones) for that.
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May 05, 2017
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tzs on
The Patek Philippe Caliber 89 and Horology’s Easter Problem
"Easter is a feast, not a planet." --Johannes KeplerA good reference for anyone who has to write calendar related code is the book "Calendrical Calculations" by Dershowitz and Reingold [1].
[1] https://www.amazon.com/Calendrical-Calculations-Nachum-Dersh...
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Aug 30, 2016
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crispyambulance on
What Time Is It?
Calendar time, when it is done truly right, is a complicated topic. There's a nice book that has way more detail on this than most people actually would want (Calendrical Calculations, https://www.amazon.com/Calendrical-Calculations-Nachum-Dersh...).
⬐ edentOoh, that book looks great. Thanks, will add it to the post.