比较SQL DATE与NUMBER

idSelectQuery=Select \"numberprgn\" 
              from \"SMT1\".\"CM3R1M1\" 
              where \"category\" != \'KM Document\' 
          AND (\"sysmodtime\" - TO_DATE(\'1970-01-01\', \'YYYY-MM-DD\')) * 86400000 > ?

\"sysmodtime\" > TO_DATE(\'1970-01-01\', \'YYYY-MM-DD\') + (?/ 86400000)

CREATE FUNCTION epoch_to_date( p_epoch IN NUMBER )
  RETURN DATE
IS
BEGIN
  RETURN TO_DATE(\'1970-01-01\', \'YYYY-MM-DD\') + (p_epoch/ 86400000);
END;

\"sysmodtime\" > epoch_to_date( ? )