How to determine the time zone for a bot in Telegram?

Question

API

We are looking for the most usability-friendly solution.
1. The simplest option is known - request a geo, determine from it. A working option, but not for the paranoid. Plus, on the desktop mac os does not work if the user has not given permission from the system settings.
2. There is an idea to ask what time it is, and determine the zone based on the current time. It is possible, but not beautiful - you need to make a bunch of buttons or manual input.
3. Inline, you can search for the city. Now we are trying to implement it this way, but it also does not seem to be the most convenient option.
Any ideas how to simplify? Switching to the web is not offered. You can ask questions to the user.