Comments on: SQL Date Math and the Leap Year

By: Jon Emmons

Jon Emmons — Wed, 29 Nov 2006 01:07:21 +0000

That’s even better Ying! So for the leap year here’s the result:

SQL> SELECT Add_Months(to_date('02/29/2004', 'MM/DD/YYYY'), 12) from dual;

ADD_MONTH --------- 28-FEB-05

Thanks for sharing your solution.

By: Gary Withrow

Gary Withrow — Tue, 28 Nov 2006 21:00:22 +0000

Nice try APC, unfortunately 1999 did not have a 2/29 date:

select to_date(’01-Mar-1999′,’DD-MON-YYYY’)-1 from dual

returns 28-Feb-1999…

By: APC

APC — Tue, 28 Nov 2006 12:34:46 +0000

Sorry. Leap years hit this one too.
SQL> SELECT Add_Months(to_date('29-FEB-1999', 'DD-MON-YYYY'),12) FROM dual 2 / SELECT Add_Months(to_date('29-FEB-1999', 'DD-MON-YYYY'),12) FROM dual * ERROR at line 1: ORA-01839: date not valid for month specified

SQL>
Cheers, APC

By: Ying

Ying — Tue, 28 Nov 2006 03:08:53 +0000

I discuss with my fren yesterday and come out a solution. Hope this will help.

SELECT Add_Months(trunc(sysdate),12) FROM dual;