Ora-01843 problem

Question

My code is giving me ora-01843 problem. When i put startdate as 01-jan-05 and
enddate as 31-jan-05, it gives me error. Please help me guys.
--declare
--ntwk_var varchar2(100);
SELECT PHY.PHYNAM,
decode (NETWORKPROTOCOL.LCC, 'Y', '<Lombardi Cancer Center>', '') ||
decode (NETWORKPROTOCOL.UMH, 'Y', ' <Union Memorial Hospital>', '') ||
decode (NETWORKPROTOCOL.GSH, 'Y', '<Good Somaritan Hospital>', '') ||
decode (NETWORKPROTOCOL.FSH, 'Y', '<Franklin Square Hospital>', '') ||
decode (NETWORKPROTOCOL.WHC, 'Y', '<Washington Hospital Center>', '') ||
decode (NETWORKPROTOCOL.HH, 'Y', '<Harbor Hospital>', '') as NETWORKID,
PRTCRC.FULLNAME,
CRCMTG.CRMTGDT, CRCMTG.CRCSTAT, PRTCRC.SUBMITTEDTOIRB,
PRTCRC.RECEIVEDIRBRESULTDATE,
PRTCRC.PRT, prtcrc.crcid,
PRTCRC.REVIEWSTATUS,
CRCMTG.CRCOUTCOME,
PRTCRC.REVIEWTYPE,
PRTCRC.MODIFICATIONDATE, PRTCRC.FINALIRBAPPROVALDATE,
PRTCRC.ACTIVATIONDATE, RECENTREAPPROVALDATE.RECENTREAPPROVAL,
recentamendmentdate.amenddate,
PRTCRC.CLOSURETOPATIENTACCRUAL, PRTCRC.TERMINATIONDATE,
prttype.descrip
FROM CRCMTG, PRTCRC, NETWORKPROTOCOL, RECENTREAPPROVALDATE, PHY, prttype, recentamendmentdate
WHERE
((CRCMTG.PRTCRCID(+)=PRTCRC.ID) AND
(NETWORKPROTOCOL.PRTCRCID(+)=PRTCRC.ID) AND
(PRTCRC.PRINCIPALINVESTIGATOR=PHY.PHY(+))
AND (PRTCRC.ID=RECENTREAPPROVALDATE.PRTCRCID(+))
AND (PRTCRC.ID=recentamendmentdate.PRTCRCID(+))
) and
TO_DATE('01'||SUBSTR(LTRIM( NVL(PRTCRC.CRCID, TO_CHAR(sysdate, 'MMYYYY'))) , 1, 6), 'DDMMYYYY') >= :startdate
and
TO_DATE('01'||SUBSTR(LTRIM( NVL(PRTCRC.CRCID, TO_CHAR(sysdate, 'MMYYYY'))) , 1, 6), 'DDMMYYYY') <= :enddate
) and
prtcrc.type=prttype.id(+) and
fullname is not null
order by &SORT

Answer 1

as Andrew had mentioned you are trying to convert a numeric into date that might not be in date format. for example you had a value of 482334
SQL> select substr(ltrim('482334'),1,6)
  2    from dual;
SUBSTR
482334then you tried to convert it into date format
SQL> select to_date(substr(ltrim('482334'),1,6),'ddmmyyyy')
  2    from dual;
select to_date(substr(ltrim('482334'),1,6),'ddmmyyyy')
ERROR at line 1:
ORA-01847: day of month must be between 1 and last day of month
SQL> it will give you an error. what is the datatype for your column PRTCRC.CRCID?