Use Clock widgets in Notification Center on Mac

On your Mac, add a Clock widget to Notification Center to easily check the time in your favorite cities around the world.

Tip: Click anywhere in a Clock widget to open Date & Time settings.

Add the City or World Clock widget (or both) to Notification Center.
You can add each widget more than once, to follow the time in even more cities.
Click the widget to flip it, click a highlighted city, then choose a different city.
Click Done in the widget, then click Done at the bottom of Notification Center.

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macOS User Guide