code: def update_meta_data(meta=None):
      
      if meta is None:
          meta = {}
      if 'DATE' not in meta:
          meta['DATE'] = strftime("%Y-%m-%d %H:%M:%S", gmtime())
      if 'PROGRAM' not in meta:
          meta['PROGRAM'] = "AegeanTools.catalogs"
          meta['PROGVER'] = "{0}-({1})".format(__version__, __date__)
      return meta
docs: Modify the metadata dictionary.
      DATE, PROGRAM, and PROGVER are added/modified.
  
      Parameters
      ----------
      meta : dict
          The dictionary to be modified, default = None (empty)
  
      Returns
      -------
          An updated dictionary.