Hello how may I help you? You can help with time zones is that right? Yes, I can help you with them. What would you like to know? What time zone is Boulder Colorado in? Boulder is located in Mountain Standard Time. How many hours off is that from eastern time? Mountain Standard Time is 2 hours behind Eastern Time. So if it is about 3 PM here it would be about 1 PM there, correct? Correct. If it is 3 PM in Eastern Time, it will be 1 PM in Mountain Time. That is what I needed to know. Thanks. You are welcome.