This worked for me in testing ...
Between IIf(IsNull([forms]![frmTest]![xDate1]),#01/01/1950#,[forms]![frmTest]![xDate1]) And IIf(IsNull([forms]![frmTest]![xDate2]),#31/12/2010#,[forms]![frmTest]![xDate2])
What I have done is chosen 2 arbitrary dates as my start and end dates which I am...