There is no exact date, because there wasn't such a focus on release dates back then. Also, the initial run of Air Jordan retros didn't sell out on their release date. Or during the release week. Or ever. They just sat there, and sat there, and sat there. MJ was retired, and apparently no one cared. In what was a near-replay of the second run of original Air Jordans, retros wound up on clearance racks for as little as $20. Given what they're selling for now, this would have been one of the best investments of the '90s.
Nike Releases the First Retro Air Jordan