May 21st Prophecy?Should I be worried?

Is the May 21st prediction that Harold Camping true or is he just a false prophet?I am a Christian but I always thought that no one knew the time nor hour of the Rapture.Why is every one else freaking out about this?I keep seeing these real time updates about earthquakes that are occurring now in various places like California and Nevada but they are not of great magnitude.Are these signs or are these regular happenings?It's not 6PM in any country is it yet?I checked the world clock and it said nothing about it being 6PM in any country yet or anything.