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From: Martin Dowie <martin.dowie@btopenworld.com>
Newsgroups: comp.lang.ada
Subject: Re: Advice on Calendar.Time
Date: Tue, 8 Nov 2005 19:29:29 +0000 (UTC)
Organization: BT Openworld
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Date: 2005-11-08T19:29:29+00:00
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REH wrote:
> Wilhelm Spickermann wrote:
> 
>>Larry Kilgallen wrote:
>>
>>
>>>If your operating system is set to make daylight savings time
>>>adjustments, you should change that setting.
>>
>>and additionally check for the handling of leap seconds. If your
>>operating system is using "posix"-time, it will _not_ count
>>positive leap seconds. There will be a positive leap second at
>>the end of this year:
>>(http://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat)
>>
>>Wilhelm
> 
> 
> My main problem is we are evaluating several compilers (we are
> upgrading, finally, to Ada 95).  I am trying to removed any
> implemtation-specific things.  I was hoping to handle time without
> needing to know if such things like posix are used or not, or whether
> local time is used.

Not sure if it will 'fix' your problem but have you had a look at the 
extensions to Ada.Calendar in AI-351? There is an implementation at 
http://www.martin.dowie.btinternet.co.uk/

This can let you get from your timezone to UTC but I think the important 
thing to realize is that dealing with time turns out to be _very_ 
OS-dependent - even with a standardized API. :-(

Cheers

-- Martin