Implementation note: you'll want a timer that runs once a minute or so to refresh the visible rows so the time doesn't get massively out of date if you do this. Doing it every second is overkill and wastes battery, you might want to therefore trap any that are < 1 minute ago and say "Now" ... so it goes "Now" ... "1m ago" ... "2m ago" .. "1h ago"
Implementation note: you'll want a timer that runs once a minute or so to refresh the visible rows so the time doesn't get massively out of date if you do this. Doing it every second is overkill and wastes battery, you might want to therefore trap any that are < 1 minute ago and say "Now" ... so it goes "Now" ... "1m ago" ... "2m ago" .. "1h ago"