As stated, XenForo excludes the period. If I use the same format XenForo has (e.g., Mar 1, 2014), but add a period, it works. The problem is that then for May, the only month that's only three letters and therefore has no abbreviation, I would get May. 1, 2014.
Is there some language conditional, if such a thing exists, that I could use to exclude the period only on May?
I personally favor the numerical format, but I'd just like to know for future reference.