There's a Greenwhich Connecticut on the East Coast, and a Newark California in the West Coast. The time difference is three hours.
But seriously Little Buddy what we are talking about here is the time zones. At zero point, if you stand on one side it's today and one step the other way would place you into yesterday or tomorrow.
Here are some sites to clear up this timeless time of all times:
GMT: Greenwich Mean Time - World Time / Time in every Time Zone Greenwich Mean Time - Wikipedia, the free encyclopedia
I think you should get it by now. If not then, you know that you don't have to be mean at any time. In the mean time, study your geography depending on where in the world you are at that time.
Got It?