[Jaxkr]

I have been guilty of this. I will sometimes use MST when I should use MDT due to muscle memory. And if I say MT it could be ambiguous when you consider Arizona (which doesn’t observe daylight savings).

I will not write “X city local time” though, I will take the extra time to make sure my timezone is correct.

[colanderman]

Often "X city local time" is what you want though. If I schedule a recurring meeting at 1 PM, most people will expect it recur at 1 PM local time. A 1 PM EDT meeting would become noon EST when the clocks switch, and no-one wants a lunchtime meeting.

[onionisafruit]

You rarely need to give a time zone when you schedule something with a physical location.