Get Data Before the Date in a slicer

[STIBBS_807]

I am struggling with how do I get my data in a Table Visual to show only data that is based on a slicer date.  So I put in the date, but I want all data that is before or on that date.  That is my start date.  Then I have an End Date, but I want that to be before or on that date or null.

Here is how I visualize the query for the data.

[Start Date] <= [Begin Date] and

([End Date] >= [Finish Date] or [End Date] = null)

How do I do that in Power BI Desktop?

[STIBBS_807]

 I tried to use the date in the Table as a filter and used "is on or before" but I have to enter the date each time I use the report.  I was hoping the slicer could give me the date to fill the filter.