Your change tracker is probably lying about when things changed
A daily collector knows when it looked. That is not the same as when the thing happened, and printing one as the other is a real error.
A customer noticed that we dated a Duolingo release to 25 July while the App Store showed it four days earlier. They were right, and it was not a display quirk.
The feed was printing the collector timestamp as though it were the event time. Duolingo shipped that build on 21 July; we first captured the app on the 25th. Apple had been publishing the true release date the whole time, sitting in the same payload we were already storing.
Three times, not one
A subtitle rewrite has no published date anywhere. The honest report is that it changed between Tuesday and Wednesday, which also tells the reader the resolution of the measurement instead of implying a precision that does not exist.
The lag is itself a signal
Once the two dates are separate, the gap between them becomes visible: how stale a daily collector’s view actually is. On our own data it ranged from same-day to four days, and that is worth showing rather than hiding behind a confident timestamp.
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