What time do i have to leave la to get to beejing china at 11 am on august 23 there time?

Question

What time do i have to leave la to get to beejing china at 11 am on august 23 there time?

Answer 1

Find an airplane flight that lands before that time in Beijing and hope for the best that it is not delayed

Answer 2

Evening of August 21.  They're a day ahead, and the flight takes 12-14 hours.  So if you leave at 10pm on August 21, you will arrive around 11am August 23.  

The best way to fly to Beijing if you want to avoid jet lag in China is to leave here in the morning.  You will arrive in the evening the next day.  So if you left at 6am August 21, maybe sleep a little on the plane, you'll arrive there at 6pm on August 22.  You'll be tired enough to sleep & ready to go the morning of the 23.