Most software tells you what it needs. It sends notifications. It opens on startup with a loading screen. It asks for your attention before it gives you anything in return. The clock on your computer is different — or it should be. A clock should tell you the time, and then disappear.
CoreClock was built from that premise. It is a world clock for Windows that lives in the system tray, shows the time for any city you choose, and makes no further demands. No subscription. No telemetry. No account. Just a clean panel, a set of cities, and the current time in each.
If you work across time zones — with a remote team, a trading desk, clients on three continents — you have probably tried to solve this with a browser tab, a phone widget, or a Windows clock setting. Each works, technically. None of them works well.
Browser tabs disappear behind your work. Phone widgets require picking up your phone. The Windows clock supports multiple time zones, but it buries them behind a click and shows them in a list that was clearly designed for someone who rarely uses it. The information exists. The friction to get it remains.
CoreClock puts the information where you already look — on your screen, in a panel that opens immediately and closes when you are done with it. The cities you care about are always there. The times update every second. There is nothing else to configure.
The default configuration shows six cities: New York, London, Tokyo, Sydney, Dubai, and Frankfurt. These are not the cities you necessarily work with, and you are not expected to keep them.
Every city is editable. You can add a city for any time zone in the Windows timezone list, assign it a flag emoji, and give it whatever name helps you recognise it quickly. A trading desk might label a city by exchange. A distributed team might label cities by the people who live there. The application does not have opinions about this.
Cities can be reordered by dragging them into place. The order you set is the order they display, every time. Your most-checked timezone goes at the top.
CoreClock does not connect to the internet. Time zone data comes from Windows directly. There are no analytics, no usage reporting, and no background network requests. The application reads your settings from a local file and writes them back to the same place.
This is not a feature. It is simply the correct way to build a clock.
CoreClock is distributed through the Microsoft Store and available as a standalone installer for environments where the Store is not used. The application starts with Windows if you choose, minimises to the tray on launch, and restores its last position when opened. Window size and position are saved between sessions.
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