Simple text imput , then results on label
<p>I want to make my first android application , it would be a very basic utility. It would be like a text input where the users time the date they want , and on a label it would say how many days its been since that date. </p>

<p>EG: User type date ---> label shows how many days as past ---> user can save their entered date and app would show still show output from the label.</p>

<p>something as simple as that. Anyone knows how I could do this ?  </p>
