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 no internet connection once it’s downloaded.

• Microsoft Store: the Store updates it for you.
• 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.

• New name, Open World Clock, and a new logo. Your settings carry over from World Clock.
• A copy menu: Copy times, Copy for Discord (times that show in each reader’s own time zone), Copy in UTC and Save calendar invite.
• Pick a meeting slot in the planner by clicking, dragging or Shift and the arrow keys, then copy it or save it as an invite.
• The X button now hides the window to the tray, with a one-time notice. Quit is in the tray menu.
• Zoom from 100% to 200% with Ctrl + + and Ctrl + -.
• Better with the keyboard, screen readers and Windows contrast themes, after a WCAG 2.2 AA review.
• Lighter: about 80 MB of memory in 3 processes, and about 0.2% of one CPU core while it sits in the tray.
• Dates follow your Windows region format when it matches the app language. Help has two columns on wide windows and new tips.
• Settings links to the website, to a bug report form that fills in your version, and to this page to check for updates.
• Security hardening: Electron 44, the app loads only its own files, and links open only for a short list of sites.
• The same app runs in your browser on the home page, with nothing to install.

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.