Well, of course you don't know:
Matthew 24:35-36 (Holman Christian Standard Bible)
35 Heaven and earth will pass away, but My words will never pass away.
36 "Now concerning that day and hour no one knows—neither the angels in heaven, nor the Son —except the Father only.
Take that, you people who thought the world may end today!
"The Christian ideal has not been tried and found wanting; it has been found difficult and left untried." — G.K. Chesterton
The Bible defends itself.
I'm glad I have a little brother. I know that even if my mom and me were left behind because of our failures, Vin would be taken. He's 5. He's still here. I haven't seen a bunch of "People Missing" reports either.
One of the things that gets me is that even if the Rapture would've been yesterday or tomorrow, the predictors would've said, "Well, we were close."
But they were still wrong!
I'm a Christian. I believe the Bible. I try to follow the Bible as best as I can--when I'm paying attention to my actions. And yes, I'm one of those people if you ask me about gay marriage or abortion, I'll say I'm against it, and then say, "It's not my rule!" To be honest, I wouldn't care if I wasn't a Christian. But since I am, I'm way more afraid of God, than you.