If you have Excel, in a spreadsheet (say in cell A1), type (without quotation marks) "=TODAY()".
Then in another cell (say A2), type (again without quotation marks)
"=SUM(A1,331)"
If you did that today, it will return 3/28/06.
If you want to check out other dates, instead of typing "=TODAY()", just type a date in cell A1.