I trying some stuffs with android as i am learning android development, now i have a scenario here.

* I want to change the android phone's system date through my application( **first i would like to know is this doable?** )

Layout is as below

![layout](https://i.stack.imgur.com/SqBNJ.jpg)

Now what i want is when the user clicks the button the date should increase by say 20 days
how can i do this.

i am unable to start...please help