code: def __get_filedate(self):
          
  
          if os.access(self.__filename, os.R_OK):
  
              # Read first line of the file
              try:
                  sar_file = open(self.__filename, "r")
  
              except OSError:
                  ### DEBUG
                  traceback.print_exc()
                  return False
  
              except:
                  ### DEBUG
                  traceback.print_exc()
                  return False
  
              firstline = sar_file.readline()
              info = firstline.split()
              sar_file.close()
  
              try:
                  self.__file_date = info[3]
  
              except KeyError:
                  self.__file_date = ''
                  return False
  
              except:
                  ### DEBUG
                  traceback.print_exc()
                  return False
  
              return True
  
          return False
docs: Parses (extracts) date of SAR data, from the SAR output file itself.
              :return: ISO-style (YYYY-MM-DD) date from SAR file