Format time differences in seconds

time_formatter.rb

class TimeFormatter
  def self.format_time(elapsed)
    return if elapsed.nil?

    seconds = elapsed % 60
    minutes = (elapsed / 60) % 60
    hours = (elapsed / 3600)
 
    "%d:%02d:%02d" % [hours, minutes,seconds]
    # hours.to_s + ":" + format("%02d",minutes.to_s) + ":" + format("%02d",seconds.to_s)
  end
end