second sort column

i noticed the multi column sorting works as intended, where the last row sorted will by default be the next second row sorted by. I would like to set it so whatever row is sorted it always goes to the date column as a tiebreaker(second column to sort by).

one way i could do this is force a date sort in a custom sort code then sort by the selected column but is there a better way to do this? it doesnt seem very effecient sorting twice.

I guess this might be possible with a custom formats which use custom comparator function -

http://www.activewidgets.com/aw.system.format/comparator.html