I'd ask them. Miscommunication isn't going to be settled through a non-involved party.
If it's to prove you're right then this is one of those trivial battles that one should just walk away from. Time and energy shouldn't be spent on such pointless endeavors. I was also taught long ago that you can still be right and be in the wrong.
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Like, I immediately in my head asked "through friday or until friday?"
If I said, "I can't hang out, I'm busy until tuesday" you would assume I'm free on tuesday, because we are looking for a time to hang out, right?
But I wouldn't use an internet forum to settle an argument with you mates, that's not goinng to end well.
If it's to prove you're right then this is one of those trivial battles that one should just walk away from. Time and energy shouldn't be spent on such pointless endeavors. I was also taught long ago that you can still be right and be in the wrong.