How do pilots fight jet lag? Jet lag, medically referred to as desynchronosis and rarely as
  circadian dysrhythmia, is a physiological condition which results from
  alterations to the body's circadian rhythms resulting from rapid
  long-distance trans-meridian (east–west or west–east) travel on
  high-speed aircraft. For example, someone travelling from New York to
  California feels as if the time were three hours later than local
  time. (Source) 


As pilots often have to travel between multiple time-zones, especially during long haul flights, with as much as 12 hours of difference between them, how do they fight jet lag?
Crew members each have their own approach to this but in general on the long haul routes, as a pilot you have at least 24h layover, so you can catchup on some sleep, walk outside for a bit (depending on the local time) and then sleep some more so you're fit for the next flight back home. At home you have a couple of days off to recover from the trip.

On the very long flights 13h+ the pilots are with at least 4 so you can do a quick nap on board as well.

As a passenger I cope with the jetlag by looking at the arrival time, do I arrive in the morning I will try to sleep on the plane, will I arrive in the afternoon the I will try to stay awake and go to bed early. By doing so I wake up easily next morning and do not feel jetlagged.