When making long trips, you can't always avoid a difference in time. That can sometimes be a problem.
Over the years I have learned it helps when you try to adjust to the new situation.
When we take a long flight, we now try to sleep through most of the flight time and then we arrive fresh at our destination.
Also, you need to convince yourself it's a couple of hours earlier or later than at the place you came from.
I can assure you, this really helps!