Learn the motive and how to resolve the ORA-01821 error message in Oracle.
Description
When you encounter an ORA-01821 error, the following error message will appear:
ORA-01821: date format not recognized
Cause
You tried to enter a date value, but you used a date format that is no longer supported via Oracle.
Resolution
The option(s) to resolve this Oracle error are:
Option #1
Check the date formats identified via the TO_DATE function. Correct the structure and retry.