Small SharePoint 2013 Calendar with day names

Hi,

we created a list using calendar list using OOTB. we need to customize the calendar to small size and change day names to Sunday to SUN,Monday to MON......

I tried below URl...i.e. working for current month.

http://isharepoint2010.blogspot.in/2014/01/small-sharepoint-2013-calendar.html

If we Move forward or backward in months that custom script is not working.