The non-link ones appear to be in the past... the link ones are future, thus a link to take you to that day on the calendar... I suppose the calendar assumes you don't need to go back quickly to something in the past...
The non-link ones appear to be in the past... the link ones are future, thus a link to take you to that day on the calendar... I suppose the calendar assumes you don't need to go back quickly to something in the past...