ATA ( Actual Time of Arrival) or ETA (Estimated Time of Arrival) should be in UTC time not local time, especially on long range flights were each waypoint could be in a different time zone. If these were all calculated in UTC they would not change and it would be much easier for the calculations to be correct. I’ve also noticed during the flight that the distances to the way points never seems to change, nor does the distance to the destination, however these ATA/ETA times keep changing. This makes it very hard to understand how much longer the flight will be. Something needs to change (program-wise) so that the predicted ETA time remains relatively constant, obviously depending on wind and speed changes.
It would also be nice that there was a clock on the 748 dashboard in UTC time as well as it would be even nicer that the “time” was actually in sync with actual real time when flying in “live weather”. I’ve noticed the time shift (in the simulation) is more apparent when going east or west as opposed to north or south. (The time shift is usually several minutes, slow by 3 to 7 minutes over the course of an hour.) Maybe this has something to do with the shifting time zones during a long flight which wouldn’t even play into it UTC was used on a consistent basis.