There are still occasions where old Line of Business applications are still in use that cannot/will not/absolutely will never work on newer operating systems. On these PCs, time zone updates for daylight savings are also not updated, and can cause some grief.
To manually create new timezones on these older operating systems, you can use Microsoft’s Time Zone Editor. The Windows NT, 2000, XP, 2003 can be downloaded here – http://download.microsoft.com/download/5/8/a/58a208b7-7dc7-4bc7-8357-28e29cdac52f/TZEDIT.exe
If you are living in a time warp called Windows 95, 98, or ME, you can download the program from the old Microsoft FTP server – ftp://ftp.microsoft.com/services/technet/samples/ps/Win98/Reskit/CONFIG/
Once downloaded, run tzedit.exe and it will install itself to C:\Program Files\TZEdit. Browse to that location and run the tzedit.exe program.
Creating a new timezone is as simple as clicking on the New button and putting in the details.