FormatSeconds API

function formatSeconds(nSeconds)
  local nSec = nSeconds % 60
  local nMin = math.floor((nSeconds /  60) % 60)
  local nHour = math.floor((nSeconds / 3600) % 24)
  local nDay = math.floor(nSeconds / 86400)

  local sReturnString = string.format("%02d:%02d:%02d:%02d", nDay, nHour, nMin, nSec)

  if nMin == 0 and nHour == 0 and nDay == 0 then
    sReturnString = string.format("%02d:%02d", nMin, nSec)
  elseif nHour == 0 and nDay == 0 then
    sReturnString = string.format("%02d:%02d", nMin, nSec)
  elseif nDay == 0 then
    sReturnString = string.format("%02d:%02d:%02d", nHour, nMin, nSec)
  end

  return sReturnString
end