The opposite of past day is next day.
There are several meanings to past.... and the opposite could be either future or present.The opposite of past is future.
If you have to be opposite on opposite day, that makes it a day, and then there was no opposite day. But that can't be true since you HAVE to be opposite, which means that you have to be normal even though there is an opposite day because you are supposed to be opposite on opposite day, which means that you act normal as if it was a normal day, because that is the opposite of opposite day. (This is a classic "liar's paradox". Since there is already an opposite day, you should have a normal day because that is the opposite of an opposite day. But then it is not an opposite day.)
No. The opposite of past is future, or present, depending on context.
a regular day
Yes, it is always true. If it was "opposite day", the actual meaning would be taken as 'it is opposite day'. If it was not opposite day, the sentence would be taken as read and would be correct. On Opposite Day : "It is not opposite day" = "It is opposite day" = True On Any Other Day: "It is not opposite day" = "It is not opposite day" = True If you said it WAS Opposite Day, it won't always be true.
The opposite of archaeology is probably something like futurism, as it focuses on studying and predicting future trends rather than excavating and studying ancient artifacts and cultures from the past.
Opposite day is on May 28
Today is 'NOT' opposite day!
The opposite of the modern era would be the past.
You could say that you are being "opposite of how other people are" on Opposite Day. If you say the opposite of an opposite, it is a true expression.
past
present