Also, if you want to install it for a future date, download the Firebug extension in firefox, and edit the calendar when you reach the installation date page. If you're not familiar how to use it, a sample at
http://goo.gl/lg2MQ will show you how.
For example:
This is July 27, 2011:
<div class="calDiv" onmouseout="dateOut(this);" onmouseover="dateOver(this);" id="27" onclick="doSelect(this,2011,6,"a");">
<div class="dayNum">27</div>
<div class="calDivTime">8am-12pm</div>
</div>
"27" refers to the day number, "2011" refers to the year, and "6" refers to the month. All you do in Firebug is to edit those numbers to your preferred date. Please note: each month is one number behind. So 4=May, 5=June, 6=July, etc.