Hello how may I help you? Can you explain how time zones work? I'm sorry, I am only programmed to calculate difference between time zones, not explain how they work. Oh. Can you tell me how many time zones there are? Would you like to know for the world or for a specific country? For the USA The USA consists of six different time zones. If it's 6pm in California what time is it in New York? If it is 6pm in California that would make it 9pm in New York. Thank you You are welcome.