Reply to partly fixed... / #3811

I added a few lines to the guide, as you suggested.

The problem with the %e formatter is rather annoying, I really didn't expect it to happen. Is your PHP-box Windows-based? According to http://php.net/manual/en/function.strftime.php#53340, Windows indeed does not support the %e formatter. I wasn't aware of that. Anyway, as this case can be easily detected in the code, it could be handled separately without too much overhead and without forcing everyone to use the %d formatter. Let me attempt a fix for that.