time.kuiper.dev is a tool I made to “look” at different timezones with the tz/iana timezone codes. I created it because then I can just send a link to people to find out their timezone and to view the time where I am. Since these timezone codes track daylight savings time in a region, it will continue to work even during the confusing boundaries.
Source code can be found at github.com/corwinkuiper/time. As an example, my time is Europe/London.