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Re: Date formatting.

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On 2025-09-29 21:40, Lawrence D’Oliveiro wrote:
> On Mon, 29 Sep 2025 18:30:06 +0100, Pancho wrote:
> 
>> I like YYYYMMDD too, but the real epiphany moment for me was when I
>> realised that all dates should be handled internally UTC, Unix time,
>> and that output format, display, is just a user preference.
> 
> As far as I can tell, it was Unix that pioneered the idea of maintaining
> system time as UTC (actually GMT in the early days), and converting back
> and forth as necessary for human interpretation. Other systems continued
> to resist the idea for decades afterwards. Windows still doesn’t do it
> today. macOS --- who can tell?

Windows has a registry boolean option to store the CMOS time as UTC. I 
have no idea if this also means internally.

> 
>> It is so obvious, and yet I worked on so many systems that messed up
>> date conversions/different time zones.
> 
> All too common, on systems like Microsoft Windows that maintain system
> time as local time, to forget that they have done the daylight-saving
> switch once, and do it a second time. That kind of bug can’t happen when
> system time is maintained as UTC.
> 
> There is an article on Bitsavers which mentions that IBM mainframes needed
> to be rebooted to switch daylight saving on and off.


-- 
Cheers, Carlos.
ES🇪🇸, EU🇪🇺;

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      Re: Favorite Font Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2025-09-28 14:03 -0700
        Re: Favorite Font Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-28 22:51 +0000
          Re: Favorite Font candycanearter07 <candycanearter07@candycanearter07.nomail.afraid> - 2025-09-30 18:30 +0000
            Re: Favorite Font Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2025-09-30 11:45 -0700
              Re: Favorite Font rbowman <bowman@montana.com> - 2025-09-30 20:04 +0000
            Re: Favorite Font Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-30 22:46 +0000
        Re: Favorite Font Stéphane CARPENTIER <sc@fiat-linux.fr> - 2025-10-04 09:31 +0000
          Re: Favorite Font Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2025-10-04 10:08 -0700
            Re: Favorite Font Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-04 21:10 +0000
      Re: Favorite Font John Ames <commodorejohn@gmail.com> - 2025-09-29 09:11 -0700
        Re: Favorite Font Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-09-29 16:45 +0000
          Date formatting. "Carlos E.R." <robin_listas@es.invalid> - 2025-09-29 19:07 +0200
            Re: Date formatting. Pancho <Pancho.Jones@protonmail.com> - 2025-09-29 18:30 +0100
              Re: Date formatting. Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-29 19:40 +0000
                Re: Date formatting. "Carlos E.R." <robin_listas@es.invalid> - 2025-09-29 21:52 +0200
              Re: Date formatting. "Carlos E.R." <robin_listas@es.invalid> - 2025-09-29 21:45 +0200
              Re: Date formatting. rbowman <bowman@montana.com> - 2025-09-30 02:08 +0000
            Re: Date formatting. c186282 <c186282@nnada.net> - 2025-09-29 23:15 -0400
          Re: Favorite Font rbowman <bowman@montana.com> - 2025-09-29 18:55 +0000

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