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: "'Sailor Moon Crystal' Trailer Arrives To Fanfare. To the excitement of fans across the glo…"
AnimeHerald's own headline, "Sailor Moon Crystal To Premiere on Neon Alley & Hulu on July 5, 2014," and its 5 June 2014 publish date directly match the pin's stored 5 July 2014 date, though the page itself returned a 403 error and could not be retrieved to confirm quoted text.
Anime News Network's encyclopedia entry confirms the series "premiered online" from 2014-07-05 to 2015-01-03, exactly matching the pin's stored 5 July 2014 premiere 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.