Filter Date Dynamically

[venuatqlik]

I need to filter a date field in a filter pane for the last 4 weeks of data. 

=DATE([Survey Start Date], 'YYYYMMDD')>Date(Weekstart(WeekName($(=max([Survey Start Date])),-4)),'YYYYMMDD')

when i add this condition to the filter, its not filtering on the right values. 

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[Chanty4u]

Try this 

=Date([Survey Start Date]) >= WeekStart(Max([Survey Start Date]) - 28)

Or may be with calculated dimension

=If([Survey Start Date] >= WeekStart(Max([Survey Start Date]) - 28), [Survey Start Date])