Today for some strange reason UTC time is used

Again, please explain what you’re talking about.

If you are again talking about the World Map, doesn’t it display UTC time until you select a departure airport, at which point it switches to local time at the departure airport? How is the sim supposed to know what time zone you want to use until you select a departure airport? Has this behavior changed?

Have you switched “Live Time” at all?

What is the process you used to arrive at your conclusion, what steps did you take, what were you expecting, and what was the old way it worked, and how is it working now?