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Every summer I take up this battle again. Don Quixote had a better shot with his windmills.

Same, I used to dutifully shift my office hours between EST and EDT accordingly in my email signature.

I just use "ET", works all year.

That's what I do. ET, CT, MT, PT.

Haha yep, I switched to that.

Can't one just write ET instead?

US ET

Only when posting their home phone number