I'm trying to work with graphs and dates, in my code I'm using Datediff to
get the serial number for a given date and then graph the value. The problem
is that the difference between 04/01/2008 (mm/dd/yyyy) and 01/01/1900 is
giving the serial number of 2 days earlier. I know that I should add one to
get the serial number for April 1st 2008, instead I'm getting the serial
number for March 31st 2008.

Isn't this odd?