Meals in the afternoon and different time zones How do Buddhist monks deal with meals while traveling across different time zones?
"Should any bhikkhu chew or consume staple or non- staple food at the wrong time, it is [an offence of Confession.]" (Paac. 37; BMC p.362).
 Here the 'wrong time' is defined to be from noon until dawn the following day. 

So regardless of which timezone a monk is in, he can consume food between dawn and noon. All you need to check is where the sun is.