RefreshTime.scala

@JSExport
def main(target: html.Div): Unit = {
  ...
  dom.setInterval(refreshTimeSummary(target) _, 600)
  ...
}

def format(d: Date) = s"${d.getHours()}:${d.getMinutes()}"
def refreshTimeSummary(target: html.Div)() = {
  val timeNeeded: Int = thingsToDo.foldLeft(0)((x, y) => x + y.time)
  val now: Date = new Date
  val endDate = new Date(now.getTime() + timeNeeded*60000)

  timeSummary.innerHTML = s"${format(now)} + ${timeNeeded} minutes on tasks = ${format(endDate)}"
}