World Clock FAQ

How many cities and timezones does the world clock support?

Over 400 cities and IANA timezones worldwide, powered by your browser’s built-in Intl API. Every timezone recognized by internet standards is available with no external API calls.

Can I save my world clock cities so they appear every time I visit?

Yes. Every city you add is automatically saved in your browser’s localStorage. When you return to ScreenTimer, your saved cities are restored with live-updating times.

Does the world clock show whether it is day or night in each city?

Yes. Each city card displays a sun icon during daytime hours (6 AM to 6 PM local time) and a moon icon during nighttime hours. This makes it immediately intuitive to see who is awake across your team’s locations.

Does the world clock handle daylight saving time changes automatically?

Yes. The world clock uses the browser’s built-in timezone database, which automatically adjusts for all daylight saving transitions worldwide, including countries that change on different dates and countries that do not observe daylight saving at all.