How to write the code in Oracle SQL (like 'CCYYMMDD' into 102 )

Question

How to write the code in Oracle SQL (like \'CCYYMMDD\' into 102 )? If someone will enter the date in the frontend, the value should return

Answer 1

If you want to convert an Oracle date into a Julian date, then you can use the TO_CHAR function with 'j' as the format.

SELECT TO_CHAR(TO_DATE('BC47120412', 'BCYYYYMMDD'), 'J')
  FROM DUAL;

Output: 0000102

If you want to convert julian date to oracle date then use query below,

SELECT TO_DATE(102, 'J') 
  FROM DUAL;

Output: 04/12/4712 12:00:00 AM BC