Download World Clock
The program can always be updated with the latest version, either with the update function within the program (info dialog) or by downloading the latest version from this website.
The latest available version of the timezone database is 2025a (download here).
If the latest version is not included in the program (check the current version in the program info dialog), you can copy it to the settings folder:
"C:\Users\{USERNAME}\AppData\Local\Sharp World Clock 8" and it becomes valid after a program restart.