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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Ada.Calendar.Formatting.Image (or Time_Of) changing the time
Date: Mon, 2 Mar 2020 17:08:07 -0600
Organization: JSA Research & Innovation
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Date: 2020-03-02T17:08:07-06:00
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What time zone did you give Image? Time zones are dependent on the time 
given, so just giving some constant is insufficient to give the correct 
local time. (A "time zone" is an offset from UTC, so of course it differs 
throughout the year for most localities.)

                   Randy.

"Marius Amado-Alves" <amado.alves@gmail.com> wrote in message 
news:e92d8c8d-a182-4990-b3f6-33c2ab90bce9@googlegroups.com...
> Feeding Ada.Calendar.Formatting.Image with an Ada.Calendar.Time_Of the 
> year, month, day, seconds on the left, we get the image on the right. Some 
> images, marked *, are 1 hour behind.
>
> 2015 1 21 32040 ( 8:54 AM) => 2015-01-21 08:54:00
> 2015 1 21 39240 (10:54 AM) => 2015-01-21 10:54:00
> 2015 7 21 32040 ( 8:54 AM) => 2015-07-21 07:54:00 *
> 2015 7 21 39240 (10:54 AM) => 2015-07-21 09:54:00 *
>
> The different input is the month, January versus July, so it looks like a 
> daylight savings thing. Is this expected behaviour? Thanks.
>
> [Compiler = GNAT Community 2018 (20180523-73)]