Hi Elliot, you can add multiple date filters to a dashboard, enhancing interactive time-based analyses. When using the primary (common) date filter, when you pick a date range, which is then applied across different visualizations with varying date datasets or dimensions. Each dashboard widget can be configured separately to determine which date dataset it utilizes. more details on Date Filter on Dashboards can be found here:
https://www.gooddata.com/docs/cloud/create-dashboards/filters/date-filters-on-dashboards/#UseDateFilteronDashboards-PrimaryvsAdditionalFilter
However, if this question refers to the CONFIGURATION > Comparison settings in a visualisation, and you would like to use a different Date Filer for the Comparison, other than the dashboards Date Filter, this is not possible.
Hope this helps!