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bug#26151: date-year-day screws up leap days prior to AD 1


From: tomas
Subject: bug#26151: date-year-day screws up leap days prior to AD 1
Date: Sat, 18 Mar 2017 10:40:22 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

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On Sat, Mar 18, 2017 at 01:10:58AM +0000, Zefram wrote:

[...]

> Where did you get the idea to use a non-linear year numbering?  What's
> your opinion of SRFI-19's (lack of) text on this matter?  You should
> consider the possibility of changing your implementation to use the
> conventional astronomical year numbering in this slot.

It seems that there are both conventions, "with year zero" (astronomical)
and "without year zero" (the more "conventional" historical usage (aka
"Common Era"), see [1].

That said, these days (and ISO 8601) go by "with year zero". Therefore
I'd sympathize with your tendency. Perhaps an option or a different set
of functions might satisfy both camps?

Definitely it needs to be documented.

Regards
[1] https://en.wikipedia.org/wiki/Year_zero

- -- tomás
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