pytz has so many timezones!

[J. Clifford Dyer]

On Mon, Oct 08, 2007 at 01:13:24PM -0700, mensanator at aol.com wrote regarding Re: pytz has so many timezones!:
> 
> On Oct 8, 1:03 pm, Carsten Haese <cars... at uniqsys.com> wrote:
> > On Mon, 2007-10-08 at 10:41 -0700, mensana... at aol.com wrote:
> > > For example, Windows has seperate listings for
> >
> > > Central America
> > > Central Time (US & Canada)
> > > Guadalahara, Mexico City, Monterry - New
> > > Guadalahara, Mexico City, Monterry - Old
> > > Saskatchewan
> >
> > > but they are all GMT-6
> >
> > But they could have different rules for Daylight Saving Time.
> 
> Which only matters if you're setting your clock.
> 

Maybe this is where I'm not understanding you:  Do you have another use for setting a timezone?  The only thing a time zone does, as far as I can tell, is set clocks relative to a shared conception of time.