Should I follow what was mentioned in the “duration of stay” or in the "validity of the visa"?

I'm from Tunisia and I got a Schengen visa from the Austrian Embassy for 28 days, the “duration of stay”, and the number of entries is 1. But the validity of the visa is from 02/08/2015 to 13/09/2015.
Do I have to stay only 28 days, for example from 02/08/2015 to 29/08/2015 or can I stay there until 12/09/2015 ?
And if I have got to stay only 28 days, then can I choose the days of stay, that's mean can I stay in Austria for example from 09/08/2015 to 05/09/2015?
Best Answer
You have to follow both.
You may enter the Schengen area at any time during the 43-day period of its validity, but you may only stay 28 days in total, and you must leave on or before 13/09/2015, even if you have not used all 28 days.
Also, since this is a single entry visa, you cannot leave the Schengen area and return on this visa, even if you have used fewer than 28 days.
However, using the visa properly establishes a good history and makes it more likely that you will receive a double entry or multiple entry visa with longer validity periods in future.
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