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 source states the quake "struck Haiti at 16:53 local time on Tuesday, 12 January 2010", which is 21:53 UTC; the USGS[2] catalogue records 21:53:10Z for event usp000h60h.
The USGS catalogue entry for this event, the authority for its magnitude, origin time, depth and epicentre.
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.