local day = 24*60*60 -- in seconds
local week = 7*day
local year = 52*week
local date = os.date

function formatters.date (t,flag)
    local diff = os.time() - t
    local nm
    if diff < day then nm = 'today'
    elseif diff < week then
        nm = date('%a',t)
    elseif diff < year then
        return date('%d %b',t)
    else
        return date('%c',t)
    end
    return nm..' '..date('%H:%M',t)
end