I think there is some confusion in this thread about what the problem is that I'd like to try and clarify. And of course if I've misunderstood then please correct me.
First, it IS possible in Visual Analytics 7.4 to set a dynamic start and end point for range sliders so that whenever you open the report, the start and end points are the first and last dates in your data, respectively. This is what Renato is referring to.
I don't believe this is what Patrick is getting at though. Rather, it sounds like Patrick wants the range slider to automatically be set so the start and end point is the first and last date of the last month in the date range. So if my full range is January to November, I want the selected range to automatically be November 1st (the first date of the last month) to November 15th (the last date of the last month), while maintaining the earliest possible starting point as January 1st in the slider.
This is currently not possible.
The closest you could get is to set the end point to be dynamic (not the start point) and then manually adjusting the start point each time the month changes.
Alternatively, you could have a drop down list or something else for Month that filters the range slider, then use the dynamic start/end points in the range slider. So if you pick November in the drop down list, the range slider is automatically filtered for the first and last dates in the November range. I don't know if that makes sense for what you're doing though. And of course it still requires a user to do something to get the date ranges to what you want, as opposed to being purely automatic.
