SC passed DST last year, but it won’t go into effect because “congress hasn’t approved it.” What? Why can Arizona keep the same time but SC has to have fed approval?
The Constitution give Congress (Article I, Section 8, Clause 5), the power to set Standards for Weights and Measures. This includes time which is a Measure.
So states can not make their own Daylight savings time rules or jump time zones unless Congress allows it.
The current law allows states like Arizona to opt out, but if a State follows DST they can only follow the current approved DST from March to November. So SC can't expand that to year round.
This is good because then every state/region would have their own DST rules and that would be confusing as hell. This way all states are on the same page.