on *:TEXT:!start:#:{
  if (%stopwatch.start) {
    msg $chan There is already an active stopwatch.
  }
  else {
    set %stopwatch.start $ctime
    msg $chan Stopwatch started.
  }
}
on *:TEXT:!stop:#:{
  if (!%stopwatch.start) {
    msg $chan There is not an active stopwatch.
  }
  else {
    var %dur = $duration($calc($ctime - %stopwatch.start))
    unset %stopwatch.start
    msg $chan Stopwatch stopped after $+(%dur,.)
  }
}