<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Mark Rogers:
I'm glad you all answered, because the only response I could think of was "Look at your watch when you take off, once again when you land, then subtract the difference". 
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Do you still fly SFO<->NRT occasionally?
Taking off from NRT, i look at my watch and
it says (say) 5 pm, then upon landing, i see
that it says 9 am...