Issue date (again)

Hi all

I have a column of strings that contain equivalent dates data.
--DDL & DML Statement
CREATE TABLE TEST_TABLE AS
(
SELECT '29-Jul-2009 NUL:NUL:NUL' col_1 FROM Dual
UNION ALL
SELECT '28-Jul-2009 16:16:16' FROM Dual
UNION ALL
SELECT '28-Jul-2009 04:16:16 PM' FROM Dual
)
/
I have therefore given as
SQL> SELECT * FROM TEST_TABLE
  2  /

COL_1
-----------------------
29-Jul-2009 NUL:NUL:NUL  -- String with no time component
28-Jul-2009 16:16:16        -- String in 24Hr Format
28-Jul-2009 04:16:16 PM   -- String in 12Hr Format

3 rows selected.
I need to convert these strings to dates

I tried the following:
SQL> SELECT col_1, SUBSTR (REPLACE (col_1, 'NUL', '00'), -2, 2),
  2         CASE
  3            WHEN SUBSTR (REPLACE (col_1, 'NUL', '00'), -2, 2) IN
  4                                                         ('PM', 'AM')
  5               THEN TO_DATE (REPLACE (col_1, 'NUL', '00'),
  6                             'DD-Mon-YYYY HH12:MI:SS'
  7                            )
  8            ELSE TO_DATE (REPLACE (col_1, 'NUL', '00'),
  9                          'DD-Mon-YYYY HH24:MI:SS')
 10         END date_col
 11    FROM test_table
 12  /
ERROR:
ORA-01830: date format picture ends before converting entire input string



no rows selected

SQL>
Can someone help me please understand what I am doing wrong in the above query, or give advice to achieve the desired results.

Thank you
Ann

You forgot the AM/PM indicator in your format mask.

SQL> SELECT col_1, SUBSTR (REPLACE (col_1, 'NUL', '00'), -2, 2),
  2         CASE
  3            WHEN SUBSTR (REPLACE (col_1, 'NUL', '00'), -2, 2) IN
  4                                                         ('PM', 'AM')
  5               THEN TO_DATE (REPLACE (col_1, 'NUL', '00'),
  6                             'DD-Mon-YYYY HH:MI:SS AM'
  7                            )
  8            ELSE TO_DATE (REPLACE (col_1, 'NUL', '00'),
  9                          'DD-Mon-YYYY HH24:MI:SS')
 10         END date_col
 11    FROM (select '29-Jul-2009 NUL:NUL:NUL' col_1 from dual union all
 12          select '28-Jul-2009 16:16:16'    col_1 from dual union all
 13          select '28-Jul-2009 04:16:16 PM' col_1 from dual
 14         )
 15  /

COL_1                   SU DATE_COL
----------------------- -- --------------------
29-Jul-2009 NUL:NUL:NUL 00 29-JUL-2009 00:00:00
28-Jul-2009 16:16:16    16 28-JUL-2009 16:16:16
28-Jul-2009 04:16:16 PM PM 28-JUL-2009 16:16:16

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