Isaac Newton tried. He hasn't been proven wrong yet. If he does turn out to be correct, it would be an incredible thing to know that you're included in an understanding of God's Awesome Plan.
What nonsense? Is there something specific that you can think of? Are you talking about the Revelation 12 sign?
Yes, I think that it's possible. So many signs were given. They must have been given for a reason. It looks to me like God wants His people to know when they've reached the appointed time. God's people have always been interested to know when the end times would begin. Even Jesus' own disciples were curious and asked Him very directly:
“Tell us, when will these things be, and what will be the sign of your coming and of the end of the age?”
If Jesus didn't want us to know He just would have said something like: "no man can know the day or the hour", and that would have been it. There wouldn't be an Olivet discourse.
"But you are not in darkness, brothers, for that day to surprise you like a thief. ...
I think that the Bible end times can be scary. Would the talk of it be less worrisome if the appointed time being considered was closer to 2075?