# File lib/wx/groups.rb, line 39
      def self.parse(raw)
        raise ArgumentError unless raw =~ /^(\d\d)(\d\d)(\d\d)Z$/
        t = ::Time.now.utc
        y = t.year
        m = t.month
        mday = $1.to_i
        hour = $2.to_i
        min  = $3.to_i
        
        if t.mday < mday
          m -= 1
        end
        if m < 1
          m = 12
          y -= 1
        end
        return ::Time.utc(y,m,mday,hour,min)
      end