%e is not supported on windows (apparently) for strftime() so we need to use an alternative such as %#d. The lang files affected are
english_gb
polish
finnish
french
swedish
%e is PHP5.1 only, so yes: this should be fixed as you suggested.
It's a strftime 'e' which is different to the date 'e'. I was going to commit the change but svn is apparently not working. Will try again later.
Changed %e to %d in SVN.