Create a calculated field similar to the following:
dateadd('month', 3, [DISCHARGE_DT])
Then, have the calculation above (the one using the parameter) reference this calculation, as opposed to the DISCHARGE_DT field.
Hope this helps!
That didn't seem to work Tracy, thanks for trying though.
I have a similar question. Using parameter control, can we hide one dashboard and show the other. Say for an example, when you select monthly, show monthly hide quarterly. Similarly do the reverse when you select quarterly.