title: How to distinguish whether the app is updated or first time installed?
body: <p>Let me clear what I mean. I’ve published on marketplace the app in version 1.0. Now I want to update my app to version 1.1. I wrote a method which should be called only when the app is updated from 1.0 to 1.1. When new users will already install the app in version 1.1 from marketplace a method should not be called.</p>
  
  <p>Any suggestion?</p>
  
  <p><strong>EDIT</strong>:</p>
  
  <p>I could solve my problem by getting date of app installation. Is there any way to obtain that kind of information in code?</p>