Your office is located in Pennsylvania, and you need to talk to a supplier in Belgium. If their work day ends at 5:30 PM, when should you call this supplier? You can call anytime, because Belgium and Pennsylvania are in the same time zone. You should call the supplier in the afternoon, because Belgium is six hours ahead of Pennsylvania. You should call the supplier in the morning, because Belgium is six hours ahead of Pennsylvania. You should call the supplier in the evening because Belgium is six hours ahead of Pennsylvania