Thank you for the input tobifjellner. ??
I often times only need lower case letters but when it comes to meta titles and descriptions i have the bad habit of Sometimes Capital All The First Letters because it stands out and looks better. In this case september looks A bit strange. My thought was that if i for example wrote [Month] instead of [month] it would become capital.
Since this seems to be integrated with wordpress dates I am perfectly fine with the way it works.
Thank you for the quick response.
