On Wed, May 25, 2016, at 11:55, Steve Jones wrote:
At 10:53 PM 5/24/2016, Brian Inglis wrote:
Federal facilities and areas within AZ are subject to federal legislation so they too observe DST.
Federal legislation deals with time zone borders, not DST observance.
AIUI there are _some_ federal laws about DST observance. The main effect of which was that before 2009, when most of Indiana on the Eastern time zone did not observe DST, the locations which did were doing so in violation of the law; states do not have the authority to permit individual areas within the state to vary their observance of DST from the statewide policy, except for a state split between two time zones may observe it in one time zone and not the other (as Indiana's Central Time regions observed DST)