Grouping 2 Week Data into 1 week

[#1]

HI,

I have a requirement like need to capture data based on 2-week range dimension.

For Eg:

Period                                                 Data

2/15/2014 - 3/1/2014                             3

3/2/2014 - 3/16/2014                             15

3/17/2014 - 3/31/2014                           20

4/1/2014 - 4/15/2014                             6

4/16/2014 - 4/30/2014                            10

I am using WeekEnd_date dimension. How to capture 2 weeks data and it should not be rollingsum.