References 287% CONFIDENCEOverall confidence: 87%How well the pin's source and references back up its dates.Weighted average of how firmly 2 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better

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.

• [1]90%
  tvmaze.com/episodes/2229/chicago-fire-1x01-pilot

  tvmaze.com· Posted Oct 9, 2026· Starts Oct 11, 2012 ✓· 50% of score

  TVmaze^[2] records this season premiere airing on NBC on 2012-10-10 at 22:00; its airstamp supplies the UTC instant.

• [2]85%
  Chicago Fire - TVmaze

  tvmaze.com· Added Oct 9, 2026· 50% of score

  The series page identifies Chicago Fire and NBC; the premiere episode is the primary source.^[1]

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