gistfile1.rb

    def seconds_to_s(seconds)
      seconds = seconds.round
      s = seconds % 60
      m = (seconds /= 60) % 60
      h = (seconds /= 60) % 24
      d = (seconds /= 24)
      out = []
      out << "#{d}d" if d > 0
      out << "#{h}h" if h > 0
      out << "#{m}m" if m > 0
      out << "#{s}s" if s > 0
      out.length > 0 ? out.join(' ') : '0s'
    end