Yes but when you put in a date, it gives you no results. In another tool I built a few years ago I used this...
Between (IIf(IsNull([Start Date m/d/yyyy]),#1/1/1900#,[Start Date m/d/yyyy])) And (IIf(IsNull([End Date m/d/yyyy]),#12/31/2200#,[End Date m/d/yyyy]))
which works but requires you to...