APEX

How can i save date and time in database through PL/SQL code (Process)
BEGIN
INSERT INTO abc
(iabc)
VALUES
(to_CHAR(:P6_vabc, 'MM/DD/YYYY'));
END;
giving me error, i try this one as well
(to_date(:P6_vabc, 'MM/DD/YYYY')); but fail.
Need solution.