Can someone help me with understanding military time and the time difference while traveling abroad? Trying to make reservations?

I get all confused with the military time as well and the time difference.
I have a flight leaving May 16 at 20:00 and it says it is a 10 hour and 30 minute flight, in which I will arrive to my destination at 15:30+1. I’m lost lol. If I need to book a hotel, would I book it for May 17? When do I actually arrive to my destination? Any help is greatly appreciated.

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