In eisy ui, on the System tab, available updates are shown. For modules other than eisy-ui, the dates of various updated versions are shown in the release notes (click on the question mark). Please add update dates in the eisy-ui release notes to conform to this standard.

Presumably a particular module version generally makes its way from staging to beta to production repos and so the date corresponds to the date the version was completed rather than when it appeared in a particular repo.