Date Data Handling

I have written the following Function as part of an Access program:

Public Function TotalWl() As Long
Dim sqlWL As String
Dim rsWL As Recordset
Dim dbWL As Database
Dim sendlDate As Date
Set dbWL = CurrentDb
sqlWL = "SELECT compul FROM qryStatisticsWL WHERE sendDate between 01/09/2004 and 30/10/2004 " 'this is all written on one line because I do not know how to split it in more than 'one lines
Set rsWL = dbWL.OpenRecordset(sqlWL, dbOpenSnapshot)
If Not rsWL.EOF Then
rsWL.MoveLast
TotalWl = rsWL.RecordCount
End If
End Function

When I call this function the result is always 0. The program does not like :
WHERE sendDate between 01/09/2004 and 30/10/2004
I have tried: WHERE sendDate >= 01/09/2004 and sendDate <= 30/10/2004
also: WHERE sendDate >= 01/09/2004 and <= 30/10/2004
I also used single quotes, like '01/09/2004 '
But nothing solved the problem. By the way, thee are data between these two dates.
Any suggestions how to proceed?