The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Happened as dated, per the pin description: "…beta, as well as commute advice, remote start, location-based air suspension, power management optio…"
CleanTechnica, published September 23, 2014, confirms the v6.0 update "recently made its way over the air," corroborating the rollout a few days after the pin's stored date.
Engadget reports Tesla rolled out Model S software v6.0, including calendar integration and traffic-based navigation, on September 19, 2014 - a day ahead of but essentially matching the pin's stored September 20, 2014 date.
Something missing or wrong? Say it in your own words: a link that backs this pin up, a different start or end date and why, or a fact it lacks or gets wrong. The AI checks it against this pin's sources, searches for better ones, and adds any page that backs you up. The pin's own sources still count most. A picture that shows something else, or shows it badly, is looked at too, and moved down or replaced.