Is this site up to date?
Almost everything here is somebody else's data, rebuilt twice a day. This page says when each piece last arrived — so you can tell a quiet Tuesday from a broken pipe.
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Every dataset
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What "stale" means here
When a rebuild fails, this site does not go down — it keeps serving the last good data. That is the right thing to do and also the risky thing, because a page showing last week's events looks exactly like a page showing this week's. So each dataset gets a window it is allowed to age within, and this page tells you when one has gone past it.
The windows are deliberately slack. The build runs at 1:15 am and 8:30 am Central, so one failed run is normal and silent; two in a row is not, and that is the point at which something here turns amber.
Nothing on this page is a promise that the underlying data is correct — only that it is recent. A calendar that publishes a wrong start time publishes it on schedule.