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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Ada.Calendar and NTP (and Unix Epoch)
Date: Tue, 24 Jul 2012 22:29:00 +0200
Organization: cbb software GmbH
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Date: 2012-07-24T22:29:00+02:00
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On Tue, 24 Jul 2012 23:43:49 +0400, Vasiliy Molostov wrote:

> Probably and personally, I don't prefer to convert between representations  
> and catch one or two hour diffs, instead I prefer to do calculations  
> better done with monotonic time, and then convert result to the required  
> representation.

This is the only right way to do it.
 
> Converting from some representation into authoritative monotonic time is  
> "mission impossibe", since important data may be lost, because this  
> important data belongs entirely to the representation, and can not be  
> expressed in monotonic authoritative source.

Possible, but under two conditions:

1. the corresponding time sources are synchronized;

2. the representation is sane (anything but political time).

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de