static LiveValue<S> clockTimeLiveValue() {
  SimpleLiveValue<S> lv = stringLiveValue();
  clockTimeLiveValue_update(new WeakReference(lv));
  ret lv;
}

svoid clockTimeLiveValue_update(final WeakReference<SimpleLiveValue<S>> lvRef) {
  SimpleLiveValue<S> lv = lvRef!;
  if (lv == null) ret;
  lv.set(localTime_24());
  doLater((timeToNextLocalMinute()+100) % 60000, r { clockTimeLiveValue_update(lvRef) });
}

Began life as a copy of #1016170