Calendar Trouble

In Macedonian, Listopad means October.
In Polish and Slovenian, Listopad means November.

In Czech, Srpen means August.
In Croatian, Srpanj means July.

In Croatian, Rujan means September.
In Czech, Říjen means October.

In Polish, Lipiec means July.
In Croatian, Lipanj means June.

In Polish, Kwiecień means April.
In Czech, Květen means May.