What is the easies to use package for dealing with time zones and DST 
changes?

I just need to be able to track when to start various activities bases 
on local times.

The problem is I have to trace a few time zones.

It looks like TZFile will do the job, but I am not sure how stable it is.
(It uses the zone files on the local system)

http://www.a-k-r.org/ruby-tzfile/

Or maybe there are other packages I have over looked.

I did look at TZinfo, but is seems to be static code not live data.

Any suggestions?

tom