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From: Spiros Bousbouras <spibou@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: getFirstDayOfMonth()
Date: Wed, 13 Mar 2024 13:38:36 -0000 (UTC)
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On Wed, 13 Mar 2024 06:01:22 +0100
jak <nospam@please.ty> wrote:
> Instead, I would be curious to understand why nobody follows a standard
> about the dates. Let's take this date for example: January 1, 1580.
> On the web 50% of the sites searched with "day of week calculator" say
> that the day was Tuesday while the others say it was Friday. Excel and
> Calc (OpenOffice) say it was Friday and the same says "cal" on *nix if
> the "--iso" option is not used. So, someone follows the ISO convention
> and others Julian but I read somewhere that the ISO convention had to be
> followed in the computer scope.

For the year 1580 what would be the appropriate standard ? I don't see any
point using a modern standard for 1580. The day of the week is a cultural
matter depending on era and location so what useful cultural information
would you get by knowing that according to a modern standard , January 1
1580 was whatever day ?