Chances this passes Congress though? Interesting read on adverse effects of the DST transition:
LINK
Most of that doesn't apply here.
It's actually a change to Atlantic Standard Time (AST) year-round. We've been discussion this on and off in the Zoneinfo project. Florida (non-panhandle) would join AST, and data going forward would match America/Port_of_Spain Zoneinfo record (and the panhandle would match America/Panama record going forward), although Florida would get it's own Zoneinfo file (and another for the panhandle), for pre-change translation, probably America/Miami given Zoneinfo nomenclature (and possibly American/Pensacola for the panhandle).
PR and US VI are already on AST year-round -- PR has been since '45 (not sure about US VI). This would put Florida, sans the Panhandle, on AST as well. Various states in New England are looking at going to AST as well, to match eastern portions of Canada. Frankly, this should have been done years ago IMPO.
Arizona and Hawaii don't change clocks. The precedent is there.
Nope. Not true.
The Congressional law allows states to skip DST -- i.e., skip moving to EDT (-0400), CDT (-0500), MDT (-0600) or PDT (-0700) -- for their respective, standard times -- i.e., EST (-0500), CST (-0600), MST (-0700) or PST (-0800) -- respectively. They can stay on the latter.
This is not a DST change. This is an entire timezone change to AST (-0400) year round. That requires Congressional approval and is not allowed by the current law.
Florida would also be the first continental US state to move to AST (-0400) as well. But NE and MA (at least the eastern part) will likely follow, and the other, select portions of of New England (at least RI and NH) will probably follow suit as well. CT, VT and western portions of MA might be a stretch though.