Force yourself to stay awake until your normal bedtime, but make it an early night. If you absolutely must get some rest, take a short nap with the hotel curtains open to the sunlight. Don't darken the room, put on your PJ's and get under the sheets. Just a short nap will take the edge off your fatigue and leave you ready to go to bed for real when it is bedtime. Use sunlight as a drug.
Sunlight is a powerful indication of local time.
Caffeine is a useful drug to help jolt your circadian clock. Force yourself to drink coffee at similar times of the day, local time. If you don't drink caffeinated beverages, use fruit juice or milk to psychologically jolt your brain to local time. Follow your regular meal schedule in local time. If you usually have a sandwich and a soda for lunch, then have a sandwich and a soda at lunch time, local time.