Full text – Daylight Saving Time – United States Law – 15 USC 6(IX)(260-7): Text of the Daylight Saving Time law ( 15 USC 260 et seq. ):
The Department of Transportation adopted rules that set the division between Eastern and Central in Indiana at 47 CFR 71.5(b). It winds along and puts Lake, Porter, LaPorte, Newton, and Jasper, Gibson, Posey, Vanderburgh, Warrick, and Spencer counties in the Central Time Zone.
Under IC 1-1-8.1 , Indiana has indicated that its Eastern time zone territory will not follow DST and its Central time zone territory will follow DST.
It could be a failure of mine, but under 15 USC 260, IC 1-1-8.1, and 47 CFR 71.5(b), I cannot see any authority to allow Clark, Dearborn, Floyd, and Harrison counties to follow eastern daylight time. If I’m right, those counties could be in violation of federal law.