select table_name,
       partition_name,
       to_date (
          trim (
          '''' from regexp_substr (
                     extractvalue (
                       dbms_xmlgen.getxmltype (
                       'select high_value from all_tab_partitions where table_name='''
                                || table_name
                                || ''' and table_owner = '''
                                || table_owner
                                || ''' and partition_name = '''
                                || partition_name
                                || ''''),
                             '//text()'),
                          '''.*?''')),
          'syyyy-mm-dd hh24:mi:ss')
          high_value_in_date_format
  FROM all_tab_partitions
 WHERE table_name = 'SALES' AND table_owner = 'SH'