How to get the value of Month and Year. if i click Next or Previous button

I want to show the value of the Month and Year if i click the Next(>) or Previous(<) button in an alert which is displayed in calendar screen.
In the above image. i have to display the current month&year(i.e sep - 2017) in an alert.how to get the value.can any one suggest me how to get the value.Thanks in Advance

Start by reviewing the calendar screen and the handlers for the Next and Previous buttons. Determine how the displayed month and year are represented and whether they can be surfaced to the alert. Done means the alert shows the currently displayed month and year after either navigation action.

Written by the indexing model from the issue text.