Pick two zones to see the offset.
Working hours overlap
Green marks the hours between 09:00 and 18:00 in both zones.
Notes
Times come from your own device clock and the IANA timezone database shipped with your browser. Nothing is sent anywhere, nothing is stored.
Offsets change: most of them shift twice a year, a few shift by 30 or 45 minutes rather than a whole hour, and a handful of zones have changed rules more than once in the last decade. When a meeting matters, check it again on the day.