SharePoint List Calculated formula

We have a SharePoint list that has a column "Open Deal Age" which is supposed to be a calculation of the opportunity start date to the current date.  (Opportunity Date is another column in the list)  The calculation does not seem to be flowing each day.  For example:

Opportunity Date 9-24-2013, the open deal age should have a value of "3" today which if I go in and create this item today it will reflect this accurately, however tomorrow it will still show a value of "3"  it should show "4" of course.  If I go in tomorrow and edit the item and not make any changes, and simply click ok while in the will update to "4" however we need this to be an automated process rather than going into each item every day.  

Do you see any issues with the below calculated formula?

=IF(Status<>"CLOSED WON",Today-[Opp Date]+1,"")

Is there a workaround for this, or any known problem that this wouldn't update?
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Rainer JeschorCommented:
this will not work.
The TODAY function result is only evaluated once the item is written (so create or update) - not dynamically.
Your only option would be to use either a Powershell script or a coded Timer Job or a web service call with batch updates to re-calculate the difference.


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