Settings
the cities (type a time zone like Asia/Tokyo, or a city name like Tokyo), which one the menu bar shows, 12- or 24-hour time, and your working hours.

About
The time in the cities you work with. The menu bar shows one city; the panel lists them all with the offset from you, whether it is already tomorrow or still yesterday there, and whether it is working hours (weekdays, 9 to 18 by default).
Inside
the cities (type a time zone like Asia/Tokyo, or a city name like Tokyo), which one the menu bar shows, 12- or 24-hour time, and your working hours.
each row can be pinned to the menu bar or copied.
times returns the time in every city.
Install
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stackbarctl install --index https://navbytes.github.io/stackbar-plugins/index.json io.navbytes.stackbar.plugins.world-clock