Been there. Don’t like it. But it’s easier to go from East to West than the other way around.
This last trip was an exception. It took several days before I got on European time. I suspect this was due to the Ambien I was taking and other factors that kept me from my usual ordeal (arriving in Europe) of arriving in the morning quite trashed, taking a several-hour afternoon nap followed by a very painful alarm-driven wakeup, shower, dinner, then a crash for the night. Come morning, I'm at least 90% functional.