Section 1-3-110 - [Effective Upon Occurrence of Contingency - see note] Mountain daylight time(1) The year-round observed time of the entire state and all of the state's political subdivisions is mountain daylight time. The state exempts all areas of the state from mountain standard time.(2) As used in this section: (a) "Mountain daylight time" means the period during a year when mountain standard time is advanced 1 hour in accordance with 15 U.S.C. 260a.(b) "Mountain standard time" means the observed time assigned to the mountain time zone in 15 U.S.C. 261.Added by Laws 2021, Ch. 447,Sec. 1, eff. 10/1/2021.Contingent effective date. Laws 2021, Ch. 447,Sec. 6 provides: (1) [This act] is effective on the first Sunday of November following the day that the governor certifies to the code commissioner that: (a) not fewer than four western states, including Montana, pass legislation to place all or a portion of those states on year-round daylight saving time, regardless of the time zone; and (b) (i) legislation enacted by congress goes into effect to amend 15 U.S.C. 260a to authorize states to observe daylight saving time year-round; or (ii) the United States department of transportation, pursuant to the department authority in 15 U.S.C. 260, et seq., approves the state's transfer from mountain standard time to central standard time. (2) As used in this section, "western states" means the states of Idaho, Montana, North Dakota, South Dakota, Utah, and Wyoming.