[codetrotter]

Your link also has an extra feature that the OP does not.

When I open https://www.timezones.digital/ it asks permission to get my current location and then displays the time for my location. And it even got the city name correct. This is great on mobile.

Whereas https://time.fyi/timezones does not currently request access to location and instead uses the location of my IP address. Which in my case is the location of my ISP and not of myself. Using the name of the city my ISP is in, which is halfway across the country from me.

[abecedarius]

Getting a location permissions popup the instant you first load a page is an annoyance, imo. Friendlier to leave that as an option you can choose if it looks worth it.