They say when demons roam the planet and everyone is aware if it but they don’t care, and actually embrace it, that’s when the tribulation comes around.
According to Christians, the creation happened 6000 years ago, the flood happened 4000 years ago, Jesus came 2000 years ago, and the next and last mark is when Armageddon happens.
(then there’s a thousand year reign)
But hey, that’s just a theory