there have always been 2 date columns shown on this page. one represents the date of the notification, and the other represents the date of the id / comment. these should usually be the same or almost the same, but they might be different if notifications get delayed for some reason. there’s actually a third column that i didn’t include, which is the last update date of the id / comment. i left that one off to save space.
in earlier versions of this page, i did include a notification ID, but in an effort save space: