Re: Advice on Calendar.Time

[Jacob Sparre Andersen <sparre@nbi.dk>]

Keith Thompson wrote:

> That might be acceptable for an embedded system.  If it's a
> user-oriented OS (like, say, Unix or Windows), making the system
> clock incorrect by an hour for half of each year would be a very bad
> idea.

Unix systems (at least those I have used) do actually by default run
the system clock on UTC without fiddling around with the hours twice a
year.  It is only the time shown to the users which is changed
(depending on where in the world they claim to be located).

> On some systems, time zone information has a default system-wide
> value, but can be changed for individual processes.  Setting the $TZ
> environment variable to "UTC" certainly isn't portable, but it might
> be good enough for the OP's purposes.

Fixing the Ada.Calendar system so you can request both UTC and "user
time" would be the right solution.  I hope this is done in Ada2005.

Jacob
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