Broken formatting while displaying both start and end date
Juts found a solution. Please create custom formatting like this:

D, F d, Y (h:ia)


Key here is to wrap time in parentheses


  (h:ia)


after that trick formatting is fixed and looks something like:


  Sat, September 21, 2013 (All day) to Mon, September 30, 2013 (All day)