Please help with the below error:
55/4 PLS-00103: Encountered the symbol ";" when expecting one of the
         following:
         loop
Script
CREATE OR REPLACE FUNCTION GET_SERVICE_HOUR(FROM_DT IN DATE, TO_DT IN DATE)
 RETURN TIME AS
 HRS NUMBER(4):=0;
 MINS NUMBER(2):=0;
 SEC NUMBER(2):=0;
 DAY_ELAPSE NUMBER(4):=0;
 N_SEC NUMBER(4):=0;
 D1 NUMBER:=0;
 SERVICE_TIME DEC(2);
 STARTDATE DATE;
 ENDDATE DATE;
 STARTDATE DATE;
 TEMPDATE DATE;
 T_TIME TIME;
 I NUMBER:=0;
 J NUMBER:=0;
 CUR CURSOR ;
BEGIN
    STARTDATE := FROM_DT;
    ENDDATE := TO_DT;
    TEMPDATE:=STARTDATE;
    FOR I IN 1..2 LOOP
        BEGIN
             IF TO_CHAR(TEMPDATE,'HH24:MI:SS') <'10:00:00' THEN
                TEMPDATE:=TO_DATE(TO_CHAR( TEMPDATE,'DD-MM-YY') + ' 10:00:00', 'DD/MM/YYYY HH24:MI:SS');

             ELSE IF TO_CHAR(TEMPDATE,'HH24:MI:SS') >'19:00:00' THEN
                TEMPDATE:=TO_DATE(TO_CHAR( TEMPDATE,'DD-MM-YY') + ' 19:00:00', 'DD/MM/YYYY HH24:MI:SS');
             ELSE
                 BEGIN
                       OPEN CUR FOR SELECT EXTRACT(HOUR FROM D )*60+EXTRACT(MINUTE FROM D ) SECS
                                           FROM( SELECT NUMTODSINTERVAL(TO_DATE(TO_CHAR( TEMPDATE )||' 19:00:00','DD/MM/YY HH24:MI:SS')- TEMPDATE,'DAY')D
                                                 FROM DUAL
                                            ) ;
                    IF CUR%NOTFOUND THEN
                       J:=0;
                    ELSE
                         FETCH CUR INTO J;
                    END IF;

                    CLOSE CUR;
                    D1:=D1+J;
                END;
             END IF;
            STARTDATE:= TEMPDATE;
            TEMPDATE:= ENDDATE;
            END IF;
     END LOOP;
     DBMS_OUTPUT.PUT_LINE('[DEBUG] D1 = ' ||TO_CHAR(FROM_DT)||' TO '||TO_CHAR(STARTDATE));
     DBMS_OUTPUT.PUT_LINE('[DEBUG] D2 = ' ||TO_CHAR(TO_DT)||' TO '||TO_CHAR(ENDDATE));
     DAY_ELAPSE:= TRUNC(ENDDATE - STARTDATE ) ;
     T_TIME:= TO_DATE('00:00:00','HH24:MI');
     CUR:= NULL;
     RETURN T_TIME;
END;
/
SHOW ERRORS;