Arithmetic on datetime objects
<p><a href="http://docs.python.org/2/library/datetime.html" rel="nofollow">http://docs.python.org/2/library/datetime.html</a></p>

<p>I use the today function to get current date, how to perform simple arithmetic on this object so that I can reduce or increase the current date by 1 or 2 (i.e. yesterday or day-before yesterday)</p>
