I am presently in India and travelling to Germany (dates in the application May 18th to October 16th) it is for 5 months. But since I have not got my visa yet, will there be still 5 months validity in my visa or will I lose some days.

What if I get Visa after two weeks? Will the dates on visa automatically start from the date they put it on passport or will they still stick to the original dates in my application?

Thanks in advance