Re: Ada.Calendar and NTP (and Unix Epoch)

["Vasiliy Molostov" <molostoff@gmail.com>]

Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> писал(а) в своём письме Wed,  
25 Jul 2012 00:29:00 +0400:

> 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;

If you can synchronize representations, you are a god of time  
representations. Be aware of Mars orbiter time representation and its  
political times.
Also take into account that a matter of some incorrectly raised question  
may issue very ample answers, involving presidential elections also.

In a nut shell, a transformational function for converting *time  
representation* should take into account those parameters, that you have  
not in your (or your opponent) application, so you can tell only relative  
*time representation*, relative to your environment, in which your app (or  
your opponent) running. It is very funny to see people converting these  
relative things on the fly (without parametrized transformation, unlinked  
to the common and absolute source), and concluding that they don't match  
something speculatively implied, indeed. Even if these are syncronized.

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

It is sane by legislative rules that are out of Ada standard control, you  
know. It is very obvious question, and I see this as an intentional  
mistake.

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