you need similar to this
cdate >= startdate and cdate <= enddate
altrernatively
cdate between startdate and enddate
note that if you are in the UK, you may need to disamibguate the dates - as in some cases access/vba will treat ambiguous dates as US, not UK
eg 1/5/2013 (1st May) may get treated as 5/1/2103 (5th Jan)