Keep track of your days ;) And learn basic iPhone programming See how it works and what's under the hood! This program displays it's sourcecode where you can learn: - Basics on how to work with Dates, Calendar - Perform basic mathematics - Set Button's title, label's title - Save settings This program is using the internal API of the iPhone for calculations To fully implement this code you have to understand the Apple's Model View Controller concept and know how to use the Interface Builder. You may use this sourcecode as you need. Please, don't email with the questions regarding the code. It comes with absolutely no warranty. Thank you for checking us out!