Date Ordinal

#!/usr/bin/env ruby

class Fixnum
    def ordinalize
        if (11..13).include?(self % 100)
            "th"
        else
            case self % 10
            when 1; "st"
            when 2; "nd"
            when 3; "rd"
            else    "th"
            end
        end
    end
end

# following line is broken for 11-19 (and for other cases)
#print ["th","st","nd","rd","th","th","th","th","th","th"][Time.now.day.to_s[-1,1].to_i]
now = Time.now
puts now.strftime("#{now.day.ordinalize}")