@staticmethod<EOL><INDENT>def _unpack_storm_date(date):<DEDENT>
year = (date & <NUM_LIT>) + <NUM_LIT>  <EOL>day = (date >> <NUM_LIT:7>) & <NUM_LIT>  <EOL>month = (date >> <NUM_LIT:12>) & <NUM_LIT>  <EOL>return "<STR_LIT>" % (year, month, day)<EOL>
given a packed storm date field, unpack and return 'YYYY-MM-DD' string.