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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Real Time IO routines
Newsgroups: comp.lang.ada
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Date: Sat, 27 Oct 2007 12:18:39 +0200
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Date: 2007-10-27T12:18:39+02:00
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On Sat, 27 Oct 2007 08:56:42 GMT, anon wrote:

>   function To_Duration is new Ada.Unchecked_Conversion 
              ( Time, Duration  ) ;

That is a bad idea. You don't know what is the internal representation of
Time. The intended effect can be achieved legally:

with Ada.Real_Time;  use Ada.Real_Time;
with Ada.Text_IO;    use Ada.Text_IO;

procedure Test is
    function Image (T : Time) return String is
       Seconds  : Seconds_Count;
       Fraction : Time_Span;
    begin
       Split (T, Seconds, Fraction);
       declare
          After : constant String :=
             Duration'Image (To_Duration (Fraction));
       begin
          return Seconds_Count'Image (Seconds) & After (2..After'Last);
       end;
    end Image;
begin
   delay 0.5;
   Put_Line (Image (Clock) & "s since the epoch");
   delay 0.5;
   Put_Line (Image (Clock) & "s since the epoch");
end Test;

--------------------
However it is quite useless to output absolute time values involving an
unknown epoch. Unfortunately there is no portable way I know of to convert
Real_Time.Time to UTC.

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