Learn the cause and how to resolve the ORA-01843 error message in Oracle.
When you encounter an ORA-01843 error, the following error message will appear:
You entered a date, but the month portion of the date was not a valid month.
The option(s) to resolve this Oracle error are:
Re-enter the date value using either a MONTH format mask.
The valid values for month are:
Or you could use the MON format mask and use one of the following values:
If all else fails, you may want to consider using the TO_DATE function and specifying the date format mask.