new_contents: # coding=utf-8
  """Time data type."""
  from __future__ import division
  
  from .base import DataTypeBase
  
  
  class Time(DataTypeBase):
      """Time"""
      _units = ('hr', 'min', 'sec', 'day')
      _si_units = ('hr', 'min', 'sec', 'day')
      _ip_units = ('hr', 'min', 'sec', 'day')
      _cumulative = True
      _abbreviation = 't'
  
      def _hr_to_min(self, value):
          return value * 60.
  
      def _hr_to_sec(self, value):
          return value * 3600.
  
      def _hr_to_day(self, value):
          return value / 24.
  
      def _min_to_hr(self, value):
          return value / 60.
  
      def _sec_to_hr(self, value):
          return value / 3600.
  
      def _day_to_hr(self, value):
          return value * 24.
  
      def to_unit(self, values, unit, from_unit):
          """Return values converted to the unit given the input from_unit."""
          return self._to_unit_base('fraction', values, unit, from_unit)
  
      def to_ip(self, values, from_unit):
          """Return values in IP and the units to which the values have been converted."""
          return values, from_unit
  
      def to_si(self, values, from_unit):
          """Return values in SI and the units to which the values have been converted."""
          return values, from_unit
  
subject: Add data type for time