How to convert string to date based on regional settings

How can I convert a simple string ("01/04/2003" or "01-04-2003" or "01 April 2003") to a date formatted according to the regional settings?
For example, if my regional settings is set to "dd mm yyyy", the result will be 01 as dd, 04 as mm and 2003 as yyyy.
If the regional settings is set to "mm dd yyyy", the result will be 01 as mm, 04 as dd and 2003 as yyyy
Hope someone can help.
Thanks in advance.

I think you have the wrong idea about how Oracle stores dates. Any date in Oracle is stored in a seven byte representation
SQL> SELECT DUMP(last_hire_dt) FROM emp_t WHERE rownum = 1;
DUMP(LAST_HIRE_DT)
Typ=12 Len=7: 119,191,5,6,1,1,1This storage is independent of the NLS date settings. The TO_CHAR(dt,format) and TO_DATE(str,format) functions serve to translate this internal representation into the external presentation supplied by the format. So, if you need to translate a date that is contained in a string into an Oracle date datatype, you need to tell Oracle how to parse the string.
If the string format matches your NLS_DATE_FORMAT parameter, Oracle will do this implicitly. Otherwise, you need to tell Oracle explicitly which piece is which. For example, is the string (ignoring the problem of two digit years :-) ):
'02/01/03'
Feb. 1, 2003, Jan. 2, 2003, or Mar. 1, 2002? If your date format is dd-MON-yyyy as mine is, then:
SQL> SELECT TO_DATE('02/01/03') FROM dual;
SELECT TO_DATE('02/01/03') FROM dual
ERROR at line 1:
ORA-01843: not a valid month
SQL> SELECT TO_DATE('30-Jan-2003') FROM dual;
TO_DATE('30
30-JAN-2003HTH
John

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