My iPhone is set to change the time zone automatically.

In France yesterday my iPhone was showing the correct local time.

At 17:41 local time (in France) I submitted a flight plan for 18:15 local time. The time on the screen was suffixed L confirming local time used.

The time used on the flightplan shown in the confirmation email was 17:15 (UTC).

why?

I was thinking it should have been 16:15 UTC, as France is +2 on UTC currently.

thank you.