For this you can easily achieve it by making a custom date in javascript:
Code:
function bookmark(){
var
newDate = new Date(),
day = newDate.getDate(),
month = newDate.getMonth(),
year = newDate.getYear();
return day + "" + (month+1) + "" + year;
}
HTML Code:
<a href="javascript: window.external.AddFavorite(location.href + 'nocache=' + bookmark(), 'Page Title');">Bookmark this page</a>
I should note that this has only been tested in IE8. I'm not sure if it works in other browsers as I don't currently have access to anything else (oh, the horror).
The only part I'm concerned about failing in another browser is the 'window.external.AddFavorite' part.
Bookmarks