62 days FYI, the calculated release date is September 24th. I arrived at that estimate simply by taking note of the days between preview and release for previous versions of iOS. I also took note of how many betas each version went through before being released. I counted the GM as a beta. Then, I multiplied the average number of betas per version by the average number of betas per day. Then I subtracted the number of days it's been since this year's WWDC keynote. I created a live countdown, too.