Why the last updated date displayed in the Help Center article editor differs from the last updated date displayed to the end-users in the Help Center?
The reason for the discrepancy between these two dates is as follows:
Last edited date returned within the editor: This date reflects the last time the content of the article was updated.
Last updated date outside the editor (shown to end-users): This date is given by this helper:
And reflects the last change to the article's meta-data, which includes new comments and up/down votes (both of which can be done by other end-users). Similarly, if you have localized content, any comment or vote on a translated article will also affect the last updated date shown to end-users for all translations as well as the source article.