Re:EU to stop changing the clocks in 2019
by Armisael16 on Monday September 17, 2018 @05:55PM
(#18010473)
That article goes into a long history of the interplay between state and federal authority in terms of time zones - most of it Indiana acting within the bounds set by congress or petitioning congress to give them exemptions.
https://en.wikipedia.org/wiki/Time_in_Indiana