Populate dates diffence

Hi Team,
I have two cells one is having startdate and other is having enddate.
Ex:startdate=8/21/2013 enddate=8/26/2013
Now what the plan is to find the difference between the two dates and populate in the cells in excel.
i.e. now difference is 6days including start and enddate
I want to populate first date 8/21/2013 in B4,second 8/22 /2013in E4,third 8/23/2013 in H4 and so on until enddate comes.
Please sugget me the way to proceed.I used auto fill to populate the date values taking the difference.
And i also want the date to be like Aug_21 for 8/21/2013
But its not considering the date it incrementing and printing Aug_32 also if startdate is 8/21/2013 and enddate is 9/01/2013


8/21/2013 8/26/2013
Aug_21 Aug_22 Aug_23
I c co I c co I c co



Thanks in advance