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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Trivial question: how to avoid confusing sec, min, hour and day in a program?
Date: Sun, 24 Oct 2021 11:48:24 +0100
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reinert <reinkor@gmail.com> writes:

> Ada seems to guarantee that Duration covers 24 hours (?). What you do
> when you need to represent for example 5 years?

This must depend on your use case.

I'd imagine you want to arrange for some event to happen 5 years in the
future. The 'natural' way to do this might be, in a task,

   delay until Ada.Calendar.Clock + Duration'({5 years});

but this comes up against two problems: first, as you note, that long a
duration might not work, and second, the computer is almost certain to
have been restarted by then, losing this task.

The second problem could be solved by, e.g., keeping a backed-up
time-ordered queue of events to be processed, with a task that delays
until the next event is due.

As for the first -- I think you may need to make an appropriate
Duration'Last part of your compiler selection criteria.