The Impact of Permanent Daylight Saving Time on Sunset Times and Clock Changes

Hawaii and most of Arizona do not observe daylight saving time, staying in one time zone year-round. Arizona's decision is based on the amount of sun the state already gets, while Hawaii's proximity to the equator means there isn't much difference in sunlight throughout the year. In the U.S., Congress would need to pass a federal law or states would need permission from the U.S. Secretary of Transportation to stay on permanent standard time to eliminate daylight saving time changes. Efforts to end clock changes have been made in nearly 30 states, but without Congressional action, residents will continue to change their clocks twice a year.