The following macro doesn't return any records.

Sub filtering()
Dim StartDate As String
Dim cStartDate As String
Dim cEndDate As String

StartDate = ActiveSheet.Cells(1, 4).Value
cStartDate = "=" & StartDate
cEndDate = "<=" & ActiveSheet.Cells(1, 4).Value + 6

ActiveSheet.Cells(5, 1).Select
Selection.AutoFilter Field:=8, Criteria1:=cStartDate, _
Operator:=xlAnd, Criteria2:=cEndDate
End Sub

However, when I go manually go to check the autofilter
(custom...) window and then click OK, I get the expected
result of the filter.

It seems the criteria for the filter aren't working very
well programatically. How can I overcome this?

TIA for assistance.
KT