Re: Inspiration for a better calendar package?

[Martin <martin.dowie@btopenworld.com>]

On Dec 9, 11:15 am, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
wrote:
> On Tue, 9 Dec 2008 02:15:55 -0800 (PST), Martin wrote:
> > Ada.Calendar, Ada.Calendar.Arithmetic and Ada.Calender.Time_Zones
> > already seem to provide all this (and more!).
>
> They do not. There is no portable way to handle UTC.
>
> Ada.Calender.Time_Zones and Arithmetic are ill-defined. It was discussed in
> comp.lang.ada in August this year. I also posted a proposal how to fix the
> issue to Ada comment.
>
> As for Ada.Calendar I doubt there should be any. It is a burden inherited
> from Ada 83. We just do not need political time otherwise than for
> formatted text output. It was silly for Ada 2005 to define time arithmetic
> in terms of political time. Especially because there  simply is no way to
> define such arithmetic. Since political time increment "+" is not a
> function of its arguments!
>
> --
> Regards,
> Dmitry A. Kazakovhttp://www.dmitry-kazakov.de

Ah, I see there is more to the Haskell library than the initial link
suggests - having found http://haskell.org/ghc/docs/latest/html/libraries/time/Data-Time.html
it does cover the areas I didn't think it did.

If someone thinks this method fixes the perceived problem there is
nothing stopping them creating a "Date_Time" package hierarchy based
on the Haskell library that could be subsequently standardized (into
Ada.Date_Time) - anyone volunteers?

Cheers
-- Martin