i get the following error. wonder why

irb(main):068:0> @@config["date"]
=> "27/12/2007"
irb(main):069:0> Time.parse(@@config["date"])
ArgumentError: argument out of range
        from e:/ruby/lib/ruby/1.8/time.rb:184:in `local'
        from e:/ruby/lib/ruby/1.8/time.rb:184:in `make_time'
        from e:/ruby/lib/ruby/1.8/time.rb:243:in `parse'
        from (irb):69
        from :0
irb(main):070:0>