Open the old Control Panel (not the new Settings App).
Set View at the top to Large Icons.
Open Open the Date and Time applet.
Select the 'Additional Clocks' tab.
On that tab, you can add extra extra clocks to the Calendar panel in Windows 11.
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how to add a timezone to the laptop time display so on clicking for the calender other timezones are displayed as well
Open the old Control Panel (not the new Settings App).
Set View at the top to Large Icons.
Open Open the Date and Time applet.
Select the 'Additional Clocks' tab.
On that tab, you can add extra extra clocks to the Calendar panel in Windows 11.
AI answer
In Windows 11, the built-in way to show other time zones with the taskbar clock is to add additional clocks.
After saving, clicking or hovering over the date/time area on the taskbar shows the extra clocks along with the local time.
If only comparing times is needed, the Clock app also supports this: