I can not figure out why in the attached database the Due Date gets calculated incorrectly (off by 1 day). If text is entered into the HLA ID field the Date Received is 8/16/2014. If then in the test dropdown "STR" is selected, the Due Date is calculated to be 8/19/2014 (should be 8/18/2014). This should be a simple database but it has proved to be more complex than anticipated. Thank you.