new_contents: # UTC implementation borrowed from the Python docs:
  # http://docs.python.org/2/library/datetime.html#tzinfo-objects
  # License is the same as the example one.
  
  from datetime import (
      timedelta,
      tzinfo,
  )
  
  ZERO = timedelta(0)
  
  
  class UTC(tzinfo):
      """UTC"""
  
      def utcoffset(self, dt):
          return ZERO
  
      def tzname(self, dt):
          return "UTC"
  
      def dst(self, dt):
          return ZERO
  
  utc = UTC()
  
subject: Add a simple UTC tzinfo implementation.