[+datefield:date=`%A, %B`:lcase+]
KP
[!Ditto? &parents=`8` &display=`1` &dateFormat=`%B %d, %Y` &paginate=`1` &paginateAlwaysShowLinks=`0` &tpl=`BlogTemplate`!]
KP
It goes in your template chunk’s date placeholder - you probably have [+date+] in BlogTemplate, you can change it to [+date:lcase+]
KP
More on PHx in the Wiki: http://wiki.modxcms.com/index.php/PHx