Well I am not sure if you are posting this as a sort of example of a extreme situation to judge rightly. But if you are struggling with the potential of this man being a true prophet of God, I would say that you consider a few of these following things:
1. clearly by going to the website, it is all about him and nothing about God, even the name of the church and the site exalt a man, the logo having a captial "I" which is the first name of this man assumedly.
2. Some of the prophecies are so general that its like guess work and man could possibly choose one these and hope they work out.
3. The Lord Jesus told us that no man will know the times or seasons, we cannot predict dates or times.
4. As mike pointed out his first prophecy is false and never came to pass.
It will be sad to see men like this before the judgement seat of Christ. The more I spend in Christian circles and see such abuse and purposeful using of the gospel and Christ for men's means makes me tremble in such a frightful way. Oh what a fearful day the judgement seat will be! May we hold tight and firm to Christ. Millions decieved, many false prophets and teachers. God help them all.