Potential to_date(string, string) function malfunction

Hi,

I'd like to report you in my opinion weird behaviour of function 
to_date(string, string). According to specs using format 'YYYY-MM-DD' in 
months portion it should tolerate 01-12 and in days portion 01-31. But 
if you try "SELECT to_date('2019-30-50', 'YYYY-MM-DD') instead of 
throwing error it outputs "2021-07-23".

This is output of 'SELECT version();' on our system: "PostgreSQL 9.4.23 
on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red 
Hat 4.8.5-36), 64-bit"

Have a nice day!

Pavel Pleva