Cap exempt availing dates

my petition was approved in On June 8, 2009,

my H1 visa was issued got 17 July 2010

Now till what date can avail H1 b cap exempt …as far as I have heard and seen I can avail H1 b cap exempt till

16 july 2016 can anyone confirm if I am correct here …

You are cap-exempt for 6 years from the date of expiry

If it expired on 17th July 2010, then it must be cap-exempted till 16th july 2016