Download Open World Clock

The Store keeps the app up to date. If the listing won’t open for you, the installer and the portable exe below are the same app.

In Windows Terminal, PowerShell or Command Prompt, run:

This installs the Microsoft Store build, so it gets Store updates too. The first time you use the msstore source, winget may ask you to accept its terms.

The installer is x64 only. On an ARM64 PC, get the Microsoft Store build, which runs natively. If you had the app back when it was called World Clock, it upgrades that install in place and your cities carry over.

It never updates itself; to update, download the new exe. It’s x64 only, so on an ARM64 PC use the Microsoft Store build, which runs natively. Settings still go to %APPDATA%\Open World Clock. If you turn on launch at login and later move the exe, turn it on again so Windows finds it in its new place.

The installer and the portable exe aren’t code-signed yet. The first time you run one, Windows SmartScreen may stop it with a blue box that says “Windows protected your PC”. SmartScreen shows that for new programs without a signature or a download history; it isn’t a verdict on what the program does.

Rather not click past a warning? The Microsoft Store build is signed by Microsoft and never shows it. And the source code is on GitHub if you want to see what you’re running.

• Windows 10 or Windows 11. The Store build needs Windows 10 version 1809 or later.
• An x64 or ARM64 processor. On ARM64, use the Microsoft Store build; the installer and the portable exe are x64 only.
• Nothing else. No runtime to install, no account, and the clocks need no internet connection once it’s downloaded.

• Microsoft Store: the Store updates it for you. Store availability depends on submission and Microsoft certification; its version can differ from the direct downloads.
• Installer: automatic updates stay off until the installer is code-signed. Download the new setup file and run it; it upgrades in place and keeps your cities.
• Portable exe: it never updates itself. Download the new exe.

Release notes for every version are on GitHub Releases.

• Microsoft Store: right-click Open World Clock in the Start menu and choose Uninstall, or use Settings > Apps > Installed apps. Its settings go with it.
• Installer: Settings > Apps > Installed apps > Open World Clock > Uninstall. Your settings stay in %APPDATA%\Open World Clock so a reinstall picks up where you left off; delete that folder to remove them.
• Portable exe: delete the exe, and the %APPDATA%\Open World Clock folder if you want the settings gone too.

Used it when it was called World Clock? On first launch, Open World Clock copies your settings from the old World Clock folder. The old folder is left alone, and you can delete it.

• Time-zone rules now match the 2026 decisions in Canada, Morocco and Cuba, preserving historical dates and repeated hours.
• Most of British Columbia stays on UTC-7; Alberta and the Northwest Territories use UTC-6; Manitoba and aligned northwestern Ontario communities use UTC-5.
• See official sources and dated examples in the Canada time changes guide.

Also included from version 1.4.0

• Find a time: the meeting planner lists the times that work for everyone for the meeting length you pick, and suggests the next date that works when none does.
• When nobody fits, it lists the best compromises: how many people are in working hours for the whole meeting, and who is outside them.
• Edit each city’s working hours from its row in the planner.
• A time that a daylight saving change skips in a city is now flagged with the city name instead of being shifted silently. Copying or sharing waits until the time is fixed.
• Share a meeting from the planner with Copy times, Copy link or a calendar file (.ics).
• A new Updates section in Settings. In the installer and portable exe, Check for updates only asks openworldclock.com for the latest version number, and automatic checks stay off unless you turn them on.

Version 1.3.2 brought the new name and logo, the copy menu, meeting slots you pick and save as an invite, zoom, a WCAG 2.2 AA accessibility review and a lighter app.

Version 1.2.0 added real sunrise and sunset, the time scrubber, the meeting planner, the world map, clock-change notes and search by abbreviation or UTC offset.

The iPhone app is in the works too, with no date yet.