App also available for free on GitHub if you can't afford it: https://github.com/depau/wearos-world-clock-tile/

A simple world clock app for Wear OS watches that allows you to add your favorite city's time zone to your watch.

It works completely offline, it doesn't track you and it doesn't contain any ads.

The time zones can be added as tiles! After setting up your favorite city, go to your tiles "Add to carousel" screen and find it there!

The app is free and open source software. See the GitHub repository for source code, more info and licenses: https://github.com/depau/wearos-world-clock-tile/