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One of the best M*A*S*H scripts was Radar explaining time differences to Major Burns when making a phone call

Frank: Corporal.
Radar: Yes, sir.
Frank: I wanna make a stateside call. It's a New York number, Canal 7-9000.
Radar: Yes, sir. I'll get on it first thing tomorrow morning.
Frank: Well, I don't want it first thing in the morning. I want it first thing now!
Radar: Uh, well, I can't reach them now, sir. I'll be calling 'em yesterday.
Frank: That's ridiculous!
Radar: They're 16 hours behind us. Our today is their yesterday.
Frank: It's five o'clock in the afternoon!
Radar: Well, that's here, sir. Back there it's one o'clock yesterday morning. Everybody's gone to bed and said "See you tomorrow", which, by the time their tomorrow comes, will be our yesterday.
Frank: Isn't it 16 hours later there?
Radar: No, sir.
Frank: Well, what if it is? When would it be now there if it was our today here?
Radar: You see, we don't have the same now. By the time their now becomes our now, this'll be then.
Frank: OK, I think I got a bead on it. In order for me to talk to them at 9 o'clock in the morning their time, what time does it have to be our when?
Radar: Uh, one o'clock our tomorrow morning will get you 9 o'clock their today there, sir.
Frank: Then that's what we'll do.
Radar: Yes, sir. As soon as I get a circuit. There's a two-day wait.
Frank: I can't wait two days! That'll be... three days ago!
Radar: Right.