Opposite Day paradox

[Rubiks]

I think it's a common belief that it's impossible to successfully declare opposite day, because that would imply it really isn't opposite day. However, I got thinking about ways to get around this. What if I said via conditional statements, "If today is not opposite day, then today is opposite day."

 

[SkyWriting]

I think it's a common belief that it's impossible to successfully declare opposite day, because that would imply it really isn't opposite day. However, I got thinking about ways to get around this. What if I said via conditional statements, "If today is not opposite day, then today is opposite day."

Similar to the trouble one gets in if they say " I am lying."
So...are they?

 

[GrowingSmaller]

Not sure I undersatnd the "opposite day" paradox, OP.

Ah, wikis:
https://en.wikipedia.org/wiki/Opposite_Day

The was i see these liar paradoxes is to treat them as contradictions.

Every assertion is by nature an assertion of truth. If I say "Its raining" then I mean "I assert itrs true its raining". So when I say "This sentence is false" its implies I am saying "Its true that this sentence is false". Which is like saying "this is a square circle..."

So "this is true and false" involves asserting "T and not-T" from which, according to the principle of explosion, anything can be derived.

So yes asaing "this is opposite day" inplies it is not an opposite day, but it also implies square circles and the exictence of pixies on the moon.