If they copied that date from some automated system it might as well be any of these.
Humans usually say “New York time”.
I'm guilty of this too, since I can never remember which part of the year constitutes "on" and which is "off", only where the boundaries are. If I stop and think I can usually remember "spring ahead is turning it on", but never off the top of my head.
https://en.wikipedia.org/wiki/Time_in_Arizona
The Navajo Nation is within Arizona's boundaries, and it does observe DST. And the Hopi Reservation is within the Navajo Nation, and it does not observe DST.
And since Arizona is surrounded by California, Nevada, Utah, New Mexico, and Mexico, all of which do observe DST, that means you have an island of no-DST (Hopi) inside an island of DST (Navajo) inside an island of no-DST (Arizona) inside an area of DST (adjoining US states plus Mexico).
There are days where I think I should go back to a mechanical watch and adjust the time each day at high noon. It won’t agree with anyone else’s time most of the time, but at least it will be correct.
Are people really that fragile? Yes and no.
The solution to thinking you're so clever is to reduce your arrogance, but the solution to thinking problems are simple is to stop assuming any problem is simple.
Isn't humility the answer to both? Someone should develop a humility course for programmers involving an "ultra drone," writing the date/time library for it, and some simulated world test cases. Such "humility exercises" are found in various disciplines. There's one for CIA analysts, involving analyzing US Civil War sites via sat photos, then having them visit in person.
It's not fragility, so much as perspective.
When you are thinking something is simple, and you say "Am I'm thinking I'm impressed with my own cleverness?" it's easy to say "no". Because it's not arrogant to think you can accomplish something simple.
When you are thinking something is simple, and you say "Am I assuming simplicity?" it's easy to say "yes".
Realizing you're committing the fallacy is the first step to avoiding it.
Rather than "I'm so clever" it is more "this isn't complicated". One can argue they mean the same thing, but I'd say they mean different things if comparing to an outside scale. The solution to thinking you're so clever is to reduce your arrogance, but the solution to thinking problems are simple is to stop assuming any problem is simple.