old_contents: # encoding: utf-8
  
  """
  .. codeauthor:: Tsuyoshi Hombashi <gogogo.vm@gmail.com>
  """
  
  from __future__ import absolute_import
  import re
  
  
  def lower_bool_converter(bool_value):
      return str(bool_value).lower()
  
  
  def strip_quote(text, value):
      re_replace = re.compile(
          '["\']%s["\']' % (value), re.MULTILINE)
      return re_replace.sub(value, text)
  
new_contents: # encoding: utf-8
  
  """
  .. codeauthor:: Tsuyoshi Hombashi <gogogo.vm@gmail.com>
  """
  
  from __future__ import absolute_import
  import re
  
  
  def lower_bool_converter(bool_value):
      return str(bool_value).lower()
  
  
  def str_datetime_converter(value):
      return value.strftime("%Y-%m-%dT%H:%M:%S%z")
  
  
  def strip_quote(text, value):
      re_replace = re.compile(
          '["\']%s["\']' % (value), re.MULTILINE)
      return re_replace.sub(value, text)
  
subject: Add a converter which convert datetime to string