The Uniform Time Act of 1966 mandates that the country use daylight saving time, but it allows states to opt out and exempt themselves from the practice of staying on standard time year-round. It does not allow states to permanently establish daylight saving time, which would keep them an hour ahead from November to March while other states switch to standard time.
A 2023 bill, which was referred to a committee in the Michigan Senate, would have adopted daylight saving time year-round, provided Congress allowed the switch.
