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.
The IPCC[2] reports listing gives the month only — "Special Report Special Report on Climate Change and Cities March 2027" — so the pin sits on the last day of that month, as a month-only date does.
The IPCC's[1] own reports index, which is where the March 2027 date for the cities special report is published.
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.