Trigger a function (code) at particular time
<p>I have created a small app, but I want it to execute automatically at a particular time. The time must be entered by the user.</p>

<p>For example : 
If my activity is, to start a particular game and I enter 5:30pm as the time, it should run that game at 5:30pm automatically, even if I close the application after I entered time.</p>
