Re: Leap Seconds

[Tucker Taft <stt@averstar.com>]

Marin David Condic wrote:
> 
> I need to do some computations involving seconds between two dates. AFAIK,
> there is nothing specific in the ARM related to the package Calendar that an
> implementation is required to account for leap seconds. Consider the
> following computation:
> 
> Some_Duration := Time_Of (1996, 1, 1, 0.0) - Time_Of (1980, 1, 6, 0.0) ;
> 
> I'd guess that an implementation having a big enough Duration would almost
> certainly consider leap years in this computation, but leap seconds might
> not be required or implemented. Across relatively small spans of time, it
> probably doesn't matter and certainly if one is only doing relative timing
> (deltas) it doesn't matter at all. However, across larger spans, it could be
> enough to make a difference. Does anyone know if it is required?

There is no requirement to support leap seconds.
I would guess it is safe to say that leap seconds
are *not* supported in any Ada implementation.
There might even be ACATS/ACVC tests that are actively unfriendly
to leap seconds, though I don't know for sure.

> 
> MDC
> --
> Marin David Condic
> Senior Software Engineer
> Pace Micro Technology Americas    www.pacemicro.com
> Enabling the digital revolution
> e-Mail:    marin.condic@pacemicro.com
> Web:      http://www.mcondic.com/

-- 
-Tucker Taft   stt@avercom.net   http://www.averstar.com/~stt/
Chief Technology Officer, AverCom Corporation (A Titan Company) 
Burlington, MA  USA (AverCom was formerly the Commercial Division of AverStar:
http://www.averstar.com/services/ebusiness_applications.html)