title: how to minus 1 week from a date and get back a custom date format
body: <p>so I have a date in this format 20-Nov-2012 and what i would like to do is minus one week from this and get back 13-Nov-2012
  I have tried this:<code>DateAdd("ww", -1, DatePart("d", Date) &amp; "-" &amp; MonthName(DatePart("m", Date), 1) &amp; "-" &amp; DatePart("yyyy", Date) )</code> </p>
  
  <p>but i get the wrong date format back :13/12/2012
  any ideas?</p>