border munincipalities will continue the practice so as to remain harmonized with adjacent US states. This bill was passed on 26 October 2022 and came into effect on the following Sunday, 30 October 2022, so that clocks will stay on standard time permanently after that Sunday's shift from daylight time. Baja California The state of Baja California (not Baja California Sur) has observed daylight saving time from several decades ago and until 1996 was the only Mexican state to observe it. As of 2022, Baja California is the only state which continues to observe DST statewide instead of along a limited border region. Sonora The state of Sonora has not observed DST since 1998 because of the non-observance of DST by its neighbor Arizona and its important economic ties with that US state. Island territories The Marías Islands and the Revillagigedo Archipelago do not observe DST. The westernmost island of the Revillagigedo Archipelago, Clarion Island, uses UTC−08:00 (PST) all the time. Quintana Roo The state of Quintana Roo had decided to not observe DST from February 1, 2015. At the same time, they switched time zone from CST to EST. See also Daylight saving time by country Time in Mexico References External links Official web of the Electric Savings Fiduciary (Fideicomiso del Ahorro de Energia) of the Mexican Federal Electricity Commission Time in Mexico Mexico