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[3] infobox gives 1 February 2015 and its text says public use began in February 2015 rather than the scheduled November 2014, but the tower opened in stages - ICE[2] says it was 'officially opened to the public in 2016' and the observation deck only opened in July 2016, with the 118th and 119th floor decks fully public from 26 April 2017.
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.
