gistfile1.rb

class Module
  UNITS = %w{second minute hour day week month year solar_year}.map { |s| s.upcase }
  CONVERSIONS = [1, 60, 60, 24, 7, 30 / 7.0, 365 / 30.0, 31558150 / 31536000.0]
  def const_missing(name)
    if name.to_s =~ /^T_([0-9]+)_(#{UNITS.join("|")})S?$/
      num = $1.to_i
      unit = $2
      previous_unit_index = UNITS.index(unit) - 1
      value = if previous_unit_index < 0
        num
      else
        (num * const_get("T_1_#{UNITS[previous_unit_index]}") * CONVERSIONS[UNITS.index(unit)]).to_i
      end
      const_set(name, value)
      value
    else
      super
    end
  end
end