Hi,
You can try this if the "Add additional clock" option no longer appears in your Windows 11 settings. Open Settings, go to Time & language, then select Date & time. Scroll down and look for Additional clocks or Related settings, in newer versions of Windows 11, this option may be listed under Related links > Additional clocks or might open through the Control Panel instead. If it’s not there, press Windows key + R, type intl.cpl, and hit Enter to open the classic Region settings window. In the Additional Clocks tab, check Show this clock, choose your preferred time zone, give it a name, and click Apply. Once done, you’ll see the extra clock when you hover over or click the time on your taskbar. Have you noticed any other settings missing since your last Windows update?
Kind regards,