Use slicer values in a calculation with PowerPivot DAX

Last week i had a question on my ask a question page, Sasha wanted to do the following:

How to define the date I want to see as “open items”.

E.g. Open Items by 25.05.2010
Item 1: Posting Date: 20.05.2010 Clearingdate: 28.05.2010 Value 100 EUR
Item 2: Posting Date: 22.05.2010 Clearingdate: 27.05.2010 Value 200 EUR
Item 3: Posting Date: 23.05.2010 Clearingdate: 24.05.2010 Value 300 EUR

Result will be 300 EUR (Item 1 + 2) Postingdate 25.05.2010 OR Clearingdate = 00.00.0000).

But how to select the 25.05.2010 for this calculation. I have not a date like 25.05.2010 in my Pivottable?

We have two challenges here:

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