time

function toString(t)
  tT = t
  string = math.floor(tT/86400).."d "
  tT = tT - (math.floor(tT/86400)*86400)
  string = string..math.floor(tT/3600).."h "
  tT = tT - (math.floor(tT/3600)*3600)
  string = string..math.floor(tT/60).."m "
  tT = tT - (math.floor(tT/60)*60)
  string = string..math.floor(tT).."s"
  return string
end