Power Apps Field controls, Collection concept in Power app

In the input field, To display the currrent data and time information.
Text(Now(), ShortDateTime)

OnSelect of any icon, In order to navigate between the screens in powerapps
Navigate(SourceScreen, ScreenTransition.Fade)

To Reset the feilds, Try this in button or close button of the form.
Reset(inputBody);
Reset(inputSubject);

Reset(inputTo);


Date:
DateDiff(Today(), DateValue("28/08/1991"))


Collections: Can be used like an array in power app.