Filter by date range for any one of three dates.

[manderson.zim]

I am working with a form called frmSearch that filters a report called rptStudies. I am already filtering two fields [Book] and [Chapter] successfully with the following code:

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Private Sub cmdFilter_Click()

Dim strFilter As String

' Build criteria string for searching by Book
If IsNull(Me.cbobook.Value) = False Then
strFilter = "([Book]='" & Me.cbobook.Value & "' Or [Book] IS NULL) AND "
End If

' Build criteria string for searching by Chapter
If IsNull(Me.txtChapter.Value) = False Then
strFilter = strFilter & "([Chapter] Like '*" & Me.txtChapter.Value & "*' Or [Chapter] IS NULL) AND "
End If

' Run the Filter
If Len(strFilter) > 0 Then
strFilter = Left$(strFilter, Len(strFilter) - 5)
With Reports![rptStudies]
.Filter = strFilter
.FilterOn = True
End With
Else
With Reports![rptStudies]
.Filter = vbNullString
.FilterOn = False
End With
End If
End Sub
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I now want to include in that filter a date range. The report should only return dates between values entered into txtStartDate and txtEndDate on the frmSearch.

Here is my problem: How do I make sure that my report returns all dates between that range when there are three dates on the report [Date1] [Date2] and [Date3]. I need the record to be returned if ANY of the three dates is within the range.