Local · Private · Free

World Clock

Watch the current time tick live in every city you care about, with the date, the day offset from yours and a day/night marker, right on your device.

Add a city / time zone

Show seconds

Calculated locally with your browser's own time-zone database (daylight-saving handled automatically), nothing is sent anywhere.

No cities yet, add one above to start the clock.

Always know what time it is, anywhere

Every clock here updates each second using your browser's built-in time-zone data, so daylight-saving shifts are handled for you and a city's "+1 day" is computed from the real calendar, not a guess. Your chosen cities are saved on this device only, and the whole thing runs offline. Free forever.

About World Clock

World Clock is a free, private productivity tool that runs entirely in your web browser. Track the current time across multiple cities and time zones at a glance. Everything happens locally on your device: nothing is uploaded to a server, no sign-up or installation is required, and it keeps working offline. Like every free tool by Digital Heroes, World Clock is 100% free with no limits.

What you can do

Track live time for multiple cities simultaneously, updating every second.

Add any city or time zone from a comprehensive list, including your local zone.

Toggle 12-hour and 24-hour display to match your preference.

See the day offset (ahead or behind) relative to your local date.

Spot day vs. night at a glance with the sun and moon indicator on each card.

Save your city list locally in your browser, with no account needed.

How to use World Clock

Open World Clock. It runs entirely in your browser, with no signup.

Select a city or time zone from the dropdown and click Add.

Use the 12/24-hour toggle and the Show seconds checkbox to customize the display.

Click the remove button on any card to drop a city, or click Reset to defaults to start fresh.

Frequently asked questions

Is World Clock free?

Yes, World Clock is completely free for everyone. No sign-up, no account and no usage limits.

Is it private? Are my files uploaded anywhere?

No. World Clock runs entirely in your browser on your own device, so your data never leaves your computer and nothing is uploaded to a server.

Does it work offline?

Yes. This tool is a Progressive Web App, once the page has loaded it keeps working offline, and you can install it as an app from your browser.

Do I need to install anything or create an account?

No. Just open the page and start using it. Installing it as an app is optional and only adds offline convenience.

What does World Clock do?

World Clock shows the live local time, date, and day offset for as many cities as you add, with a day/night indicator on each card. You can toggle between 12-hour and 24-hour formats and show or hide seconds. Your city list is saved in your browser automatically.