"Ending Daylight Saving Time: How Two States and Mexico Made the Change"

As daylight saving time begins in most of the U.S., two states and several territories do not observe it. Arizona and Hawaii have opted out of daylight saving time for reasons including hot temperatures and proximity to the equator. Efforts to end or adopt daylight saving time permanently have been made at both state and federal levels, with some states passing laws for year-round daylight saving time and federal bills proposing its permanent implementation.