Open World Clock

Open World Clock is a world clock for Windows 10 and 11 made for working with people in other time zones.

Add the cities you work with and see them side by side. Type a time in any city, or scroll the mouse wheel over a clock, and every city converts at once, with +1 day markers where the date changes. The meeting planner lines up a 24 hour row per city, with working hours and days for each one, and highlights the hours when everyone is at work. There is also a live day and night world map.

It can stay above other windows, sits in the tray, has light and dark themes and 12 or 24 hour clocks, and is available in English, Portuguese and Spanish, with keyboard and screen reader support.

It is completely free and open source under the MIT license. No ads, no account and no telemetry: the app makes no network requests and works offline. It is on the Microsoft Store, with an installer and a portable exe on the website, and the same app runs in the browser on the home page.