how to display 'added time' as number of days since that date

how to display 'added time' as number of days since that date

hi
 
for the field added.time we would like to display it in our 'view' as number of days since that date. ie. 4 days.
 
so anytime someone uses this view it will show them the current days it has been since the added.time
what do i have to do to get this working? or do i need to use some kind of report/schedule?
 
cheers
Lathan