Dashboard - Technique for listing selected rows in a narrow date/time window?

[FerdH4]

I have a transactional table where every record in this table has a single combined-date-time field (like CCYY-MM-DD HH:MM:SS for example) to mark the record's create date and time.     

I want to use a Dashboard List Visualization to display a very narrow list of records in that table - for example, the records created in the most recent five-minutes (five-minutes past through the current time).

Is there a Dashboards authoring technique that I can use to filter the records as described above?  Or, is this only possible with a change to the data model?  [I don't have control nor influence over the data model - I have to work with the data that I have.]

By the way, I don't expect the number of data points to risk coming near to the 3,000 Visualization limit.

[dougp]

I just tried this.  I assume you had the same experience, but I'll document it here for others.

Creating a calculation

Code Select Expand

if ( [namespace].[query subject].[datetime item] > _add_minutes ( current_timestamp , -5 ) )
then (1)
else (0)

won't work because, oddly, calculations can't be used as filters.

[FerdH4]

Dougp - thanks kindly for making the assumption that I did - or eventually would - think of that idea.  I haven't gotten that far yet.  Deers in the headlights kind of trauma. 

I included in my post one of the simplist real-life examples of what I'm trying to accomplish.  But seems that all of the date data items in this data model are all very complex.   :o