I was wondering how Jetlag would be coming from San Francisco to Manila( the flight goes via Agana Guam on the same plane). It Departs from SFO at 9:05 PM and Arrives Manila at 5:40AM 2 days later. On the return it departs at 10:30PM and Arrives at 6:30 PM the same day. Being that this would be in winter I know the time difference is 8 hours.

Is it true that I won't get jetlag as I will fall asleep after dinner around 12 and wakeup before the flight arrives and pretend to start my day at 6 AM, take a shower etc.

On the return flight if I go to sleep after dinner fora few hours and then stay awake for the rest of the flight as I arrive at 6:30 PM and by the time I get home it will be around 9 PM.

Are these good flights to avoid jetlag? Any tips for flying from Manila to SF? To me the date line has nothing to do with Jetlag as the time difference is 8 hours. Or is it 16 hours due to the dateline.