Colorado is on Mountain Time. New York is on Eastern Time. So, New York is two hours ahead of Colorado. If it's 6 AM in Colorado, then it's 8 AM in New York.
The U.S. has four main time zones. From west to east, they are: Pacific Time, Mountain Time, Central Time, and Eastern Time. Each is one hour later than the last. For example, if it's 3 PM Pacific Time, then it's 4 PM Mountain Time, 5 PM Central Time, and 6 PM Eastern Time.