title: Setting A particular Day in a date
body: <p>I am using Calender Extender Control in the AjaxControlToolkit. There are basically 2 controls of date : <code>Start Date</code> and <code>End date</code> (both associated with calender extender). Based on start Date selected, I populate date in the end date field like adding no of months or days. But like I have been able to add months, but also wants to set a particular day of that month which I am unable to do.</p>
  
  <p>Example:
  Today date is <code>18 Dec 2012</code>. Something like 1st of every three months, So I add 3 months the month comes out to be <code>Feb 2013</code>. But I want to set Day <code>1st Feb 2013</code>. I am unable to do it. Kindly help.</p>