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 arstechnica.com: "…updates to its developer tools with the release today of Visual Studio 2013 Update 3. As with previo…"
InfoQ, published 7 August 2014, independently reports "Microsoft[3] has released Update 3 for Visual Studio 2013 and the RTM designation means it is now safe to use in production environments," corroborating the release just three days after the pin's stored date.
Microsoft's own DevBlogs post states "Today we released Update 3 for Visual Studio 2013," dated 4 August 2014 - the primary source confirming the pin's exact stored 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.