Locales for date-formatting are supplied by the moment library. Timezone is also used to calculate countdown deadline in countdown mode. Default is moment's guess (whatever that is on your computer). This timezones are supplied by the moment timezone library.
If countup is chosen then set the Countup Begin Time to start the countup. If countdown is chosen then set the Countdown End Time to start the countdown.
Show the time in another office or show a countdown/countup to an important event. The Clock Panel can show the current time or a countdown/countup and updates every second.