How do I change the first letter in the date line to a capital

I am trying to change the date line on my blog posts to have a capital letter for the Month and Name of the user.

Currently it reads:
december 15, 2013 by heather bayer 0 comment

I would like it to read:
December 15, 2013 by Heather Bayer 0 comment

I am using the Genesis Framework with Eleven40 Child theme.

Many thanks for your help.