After re-install tzdata package, the app can set the timezone correctly.
- Bug#1127496: systemsettings: Fail to set timezo... Bob Wong
- Bug#1127496: Close this bug Bob Wong
- Bug#1127496: systemsettings: Fail to set t... Aurélien COUDERC
- Bug#1127496: marked as done (systemsetting... Debian Bug Tracking System
