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.
Estimated: Wikipedia's[2] staging table ends stage 3 in 2028, but Dezeen[3] (5 March 2024) and the City of Vienna give the district's completion as 2030, and the pin's date is that completion, so it uses the end of 2030.
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.