In the Date & Time pane, select the Clock tab. To adjust the Mac’s built-in date and time options, launch System Preferences. There are ways to get this information built into macOS, but there are also third-party apps that can augment or entirely replace the default Apple experience. But rather than relying on a watch or desk calendar, you can of course use your Mac.
If you’re an organized type, having the time and date at hand is a must. How To Power up the date and time in the macOS menu bar
