Hello how may I help you? I have a question about time zones. Yes I know the answer What is the time difference between NY and Ireland? Dublin is five hours ahead of NYC Thank you! Also, how do time zones work? It is currently 2:38 AM there What I mean is how are time zones calculated? The Earth is round and thus the sun rises at different times, so we divide it by Meridians and they form time zones Wow, that's a great answer. Thank you! The Prime Meridian is in Greenwich England and all time zones are relative to it