What is a world clock?
A world clock shows the current time in multiple cities at once, side by side. Instead of doing the math in your head — “if it’s 3 pm here, what time is it in Tokyo?” — you pin the places you care about and read them all at a glance. World on Time keeps every clock live and updates automatically when a city enters or leaves daylight saving time.
How to use it
Search for any city and add it to your list. Reorder it, remove the ones you no longer need, and toggle between 12-hour and 24-hour format. Your cities are saved in your browser, so they’re still here next time you visit — no account required. Because it’s a Progressive Web App, your world clock keeps working offline once you’ve loaded it.
Who uses a world clock
Remote teams checking whether a colleague is awake before sending a message. Travelers keeping one eye on home. Families spread across continents. Anyone scheduling a call, a livestream, or a market open across borders. If your day touches more than one time zone, a world clock saves you from the mental arithmetic — and the occasional 3 am phone call.
Frequently asked questions
Does the time update automatically for daylight saving?
Yes. Every city follows its official IANA time zone rules, so when a region springs forward or falls back, its clock here adjusts on the correct date — you don’t have to do anything.
Are my cities saved if I close the tab?
Yes, in your browser’s local storage. They stay private to your device unless you sign in to sync them.
Does it work offline?
Yes. Once loaded, the world clock runs entirely on your device’s clock and bundled time zone data — no connection needed.