Not a Valid Mounth

Today, I’d like to write about a tiny little issue – which can cause some real trouble in Oracle 19c. This blog post is about the Pitfall: ORA-1843 – NOT A VALID MONTH in Oracle 19.4 – 19.8.

The Testcase

My testcase is super-simple – and you can reproduce it even without any object in 2 seconds (one for “copy“, the other for “paste“). Simply execute this query:

select to_date('20191120','RRMMDD') from dual;

Or this one where I replace “RR” with the more common “YY”:

select to_date('20191120','YYMMDD') from dual;

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