Update peps/pep-0012/pep-NNNN.rst

Co-authored-by: Marc Mueller <30130371+cdce8p@users.noreply.github.com>

Author: warsaw

peps/pep-0012/pep-NNNN.rst

@@ -92,7 +92,7 @@ Change History
 ==============
 
 [A summary of major changes the PEP has undergone.  Whenever you update the ``Post-History``, add a new bullet
-item in newest-first (i.e. reverse chronological) order, using the same ``MMM-DD-YYYY`` format, with
+item in newest-first (i.e. reverse chronological) order, using the same ``DD-MMM-YYYY`` format, with
 sub-bullets summarizing the changes.  You can use the same link for the date bullet as you do in the
 ``Post-History`` addition.]