Arizona is on permanent standard time, which many seem to prefer over DST or permanent DST. This new law is trying to force permanent DST, which the US actually already signed into law back in 1974 and then repealed it within a year because no one liked it. Also, while permanent standard or DST may work in southern states, it becomes more problematic in northern states, particularly close to the edges of time zones. You could see sunrise as late as 9:30 am in some of these cases with permanent DST.