this class has information about a time zone (utf offset, daylight saving time)
and methods for converting between UTC and local time
structs User and Config has a TimeZone object
System::ToLocal() and System::ToUTC() uses it for converting
(depending whether a user is logged or not)
git-svn-id: svn://ttmath.org/publicrep/winix/trunk@842 e52654a7-88a9-db11-a3e9-0013d4bc506e