What's the official release date of iOS 14?

Sometime on September 16th.

Hi, it is released today, Sept. 16, 2020. Go to Settings > General > Software Update.

9.16 (today.) Source:

https://www.apple.com/ios/ios-14/

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Today (September 16th, 2020) at 10:00 am Pacific Time.

Hasn’t happened yet on 16 September 2020 at 3:20 p.m. EDT in Jacksonville, Florida.