ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins50% CONFIDENCEOverall confidence: 50%How well the pin's source and references back up its dates.Weighted average of how firmly 1 reference, the source included, supports the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidence
Site-preparation start: approximate calendar placement from the published year, month, or season; the selected day is a placeholder, not a verified event day. This is not an opening date.[1]Microsoft reports site preparation began in September 2024. Its November 2025 update describes continuing construction traffic and earthworks; operation is not established.
1.00