Is there any way that i could control a date picker using a button, like a button for next day or today?
As far as I know controls are read-only and can’t be automated. I.e. you can’t create a button that changes the value of a date control.
But you can create your own date control, in a roundabout kind of way. With a named formula you can even make access to the value the same as a real date control.