Oracle Message ORA-14120 - incompletely specified partition bound for a DATE column

ERRORincompletely specified partition bound for a DATE column
CAUSEAn attempt was made to use a date expression whose format does not fully (i.e. day, month, and year (including century)) specify a date as a partition bound for a DATE column. The format may have been specified explicitly (using TO_DATE() function) or implicitly (NLS_DATE_FORMAT).
ACTIONEnsure that date format used in a partition bound for a DATE column supports complete specification of a date (i.e. day, month, and year (including century)). If NLS_DATE_FORMAT does not support complete (i.e. including the century) specification of the year, use TO_DATE() (e.g. TO_DATE(01-01-1999, MM-DD-YYYY) to fully express the desired date.