Procedure with IN and OUT date parameters

Question

Hello Guys,
could you please tell me where i am doing wrong, i want to get or return the date from the below procedure. It is throwing below error when i try to execute it, appreciate your help.
Execute Statement:
exec get_nxt_trd_dt('09/03/2010')
Error Message:
PLS-00306: wrong number or types of arguments in call to 'GET_NXT_TRD_DT'
Procedure Body:
CREATE OR REPLACE PROCEDURE GET_NXT_TRD_DT
(INPUT_DT IN DATE,OUTPUT_DT OUT DATE) IS
BEGIN
SELECT MIN(DATES) INTO OUTPUT_DT FROM (SELECT DISTINCT DATES FROM (
SELECT * FROM
SELECT TRUNC(TO_DATE(TO_CHAR(SYSDATE,'YYYYMMDD'),'yyyymmdd'),'Y')+ROWNUM -1 DATES FROM
SELECT 1
FROM Dual
GROUP BY CUBE (2, 2, 2, 2, 2, 2, 2, 2, 2)
WHERE ROWNUM <= ADD_MONTHS(TRUNC(TO_DATE(TO_CHAR(SYSDATE,'YYYYMMDD'),'YYYYMMDD'),'Y'),24) - TRUNC(TO_DATE(TO_CHAR(SYSDATE,'YYYYMMDD'),'YYYYMMDD'),'Y')
WHERE TO_CHAR( DATES, 'DY') NOT IN ('SAT','SUN')
MINUS
SELECT DISTINCT HOLIDAY_DATE FROM HOLIDAY )
WHERE DATES BETWEEN TO_DATE('08/01/2010','MM/DD/YYYY') AND TO_DATE('09/30/2010','MM/DD/YYYY')
WHERE DATES > TO_DATE(INPUT_DT,'MM/DD/YYYY');
END;

Answer 1

That worked thank you. Could you please help on the below, how to execute the same plsql block defined as function?? Thank you.
Execute stmts used:
(1)
DECLARE
DT DATE;
BEGIN
GET_NXT_TRD_DT(TO_DATE('09/03/2010','MM/DD/YYYY'),DT);
END;
Error Message: PLS-00221: 'GET_NXT_TRD_DT' is not a procedure or is undefined
(2)
DECLARE
BEGIN
GET_NXT_TRD_DT(TO_DATE('09/03/2010','MM/DD/YYYY'));
END;
Error Message: PLS-00306: wrong number or types of arguments in call to 'GET_NXT_TRD_DT'
Function Body:
CREATE OR REPLACE FUNCTION GET_NXT_TRD_DT
(INPUT_DT IN DATE,OUTPUT_DT OUT DATE) RETURN DATE IS
BEGIN
SELECT MIN(DATES) INTO OUTPUT_DT FROM (SELECT DISTINCT DATES FROM (
SELECT * FROM
SELECT TRUNC(TO_DATE(TO_CHAR(SYSDATE,'YYYYMMDD'),'yyyymmdd'),'Y')+ROWNUM -1 DATES FROM
SELECT 1
FROM Dual
GROUP BY CUBE (2, 2, 2, 2, 2, 2, 2, 2, 2)
WHERE ROWNUM <= ADD_MONTHS(TRUNC(TO_DATE(TO_CHAR(SYSDATE,'YYYYMMDD'),'YYYYMMDD'),'Y'),24) - TRUNC(TO_DATE(TO_CHAR(SYSDATE,'YYYYMMDD'),'YYYYMMDD'),'Y')
WHERE TO_CHAR( DATES, 'DY') NOT IN ('SAT','SUN')
MINUS
SELECT DISTINCT HOLIDAY_DATE FROM HOLIDAY )
WHERE DATES BETWEEN TO_DATE('08/01/2010','MM/DD/YYYY') AND TO_DATE('09/30/2010','MM/DD/YYYY')
WHERE DATES > INPUT_DT;
RETURN(OUTPUT_DT);
END;
/