Hello how may I help you? I want to know how time zone work Unfortunately I cannot help with that information, but I can help calculate time zones. Okay can you tell me where in the world has the largest time difference from New York Yes, it would be Russia Okay and how many hours is it ahead of New York? Russia is ahead by 7 hours Okay. Good to know. How many hours is Hawaii's time difference from St. Petersburg, Russia? Looks like Russia is ahead of Hawaii by 13 horus hours* Wow. Okay thanks for all your help You're welcome!