How to fix the Oracle error ORA-27423: calendar clause string specified more than once?

In this post, you’ll learn more about the Oracle ErrorORA-27423: calendar clause string specified more than once with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-27423: calendar clause string specified more than once

Reason for the Error ORA-27423: calendar clause string specified more than once

The calendar definition contained a clause that was specified twice or more times.

How to fix the Error ORA-27423: calendar clause string specified more than once ?

You can fix this error in Oracle by following the below steps

Append the values in the second clause to the first clause and remove the second clause.