The time in, say Rome is the Greenwich Mean Time (GMT)-1.00 hour. The time in New York is the GMT -5.00 hr... Simple Algebra says add the sum of 2 negative numbers.. so if it is 1 PM in NY, then it is six hours later in Rome. or 7PM. Or you can look on the timezone map on a Navigator, or clicking into the time in your taskbar on your PC. Finally you can call somebody there, like the Pope and ask him what time it is!