[fw-general] Use Zend_Date to get the difference between to dates?

[Joshua Ross]

I am trying to use Zend_Date to calculate a person's age by determining the 
difference between now and the person's birthdate.  At first glance I don't 
see anything in Zend_Date to do that.  I guess it is as simple as getting 
the difference between two dates which I thought would be implemented. 
Maybe it is and I overlooked it? Has someone else tackled this before or can 
maybe tell me that I'm blind today?  =]

-Joshua-