I did not click through to the site, nor would I encourage you to do so. But this type of public prediction is really sad for a couple of reasons.
1. The people that produced this message in effect are claiming to know more than Jesus and the angels (Matthew 24:36).
2. If your guess at the date is wrong, you have done harm to the Name of Christ and cost yourself all credibility, both within and outside the church (Deut 18:22, Jer 28:9).
3. I am guessing that relatively few people are threatened into the kingdom of God. I know that God can use any means He chooses to save people, but it would seem to me that there are more effective ways to communicate the gospel.