Delete Records Using A Date Field

I've got a table with three fields:

ref (Autonumber)
notice (memo)
expdt (Date)

I'm trying to use an SQL statement to delete all records where expdt < the current date (Now). Here is the code I'm using:

<%
If Request.Querystring("act") = "clean" Then

Set conn = Server.CreateObject("ADODB.Connection")
conn.Open ConnStr

strExpdt = cdate(Now())

sql = "DELETE FROM tblNboard WHERE expdt < " & Now()

conn.Execute sql

conn.close
set conn = nothing

strResponse = "All expired notices have successfully been deleted."

End If
%>

However, this just gives me the following error:

Syntax error (missing operator) in query expression 'expdt < 11/12/2003 19:54:25'.

What am I doing wrong??