I have created measures using FIRSTDATE() and LASTDATE() and named them Selected Start Date and Selected End Date, respectively. I have added these values as filters to other measures. For filtering, I have added month and year slicers to filter a calendar table.
As an example, I have selected May 2016 in the slicers. When I add the Selected Start Date value to the page, the value shows up as 5/1/2016. When I look at measures using the Selected Start Date value, it uses 1/1/1900 as the date. Why would the value be correct on the page but incorrect in the measures using the Selected Start Date value? The Selected End Date shows up correctly in the other measures.