I might have confused you. I mean whether pilots want to know the universal time during flying in order to meet the scheduled time of arrival, not the local times. The RTA page on FMS indicates ETA and RTA. Pilots can monitor the time error between the two, and control ownship speed to meet RTAs at every waypoints. In this operational situations, ETA and RTA are indicated with universal time format. I wonder if the indication of universal current time (UTC) on ND will be helpful for pilots while checking universal form ETA and RTA. And even regardless of RTA operations, I wonder if commercial pilots do not need to check universal current time (UTC) during flying.