There are many currency exchange facilities in Boston.
Most banks exchange currency as do a number of travel centers in the city.
Exchange services are more limited outside of Boston, and it's best to carry U.S. currency travelers checks or small amounts of U.S. cash. Some restaurants accept cash only. The Eastern Time Zone is 5 hours behind Greenwich Mean Time. From the first Saturday in April until the last Saturday in October, New England observes Daylight Savings Time and turns all its clocks ahead one hour. Winters are cold and brisk and temperatures may hover around freezing.