code: def get_content_modified_time(cls, abspath):
          
          stat_result = os.stat(abspath)
          modified = datetime.datetime.utcfromtimestamp(
              stat_result[stat.ST_MTIME])
          return modified
docs: Returns the time that ``abspath`` was last modified.
  
          May be overridden in subclasses.  Should return a `~datetime.datetime`
          object or None.