If you depend on an app that clearly shows accurate due dates, be careful with this app by ensuring you have the "include end date" properly set in settings. Many people dont include the beginning date, but do include the end date. (e.g. 3 days from July 3 is July 6, right? Not if you dont have the end date set correctly in this program.) This program automatically includes the beginning date and lets you set whether to include the end date. Turning end date on in the above example gives you July 5.
The program should be a little clearer with the effect of this option.
The Real Danno about Date Wheel date calculator, v1.9.0