var atMidnight = getChannelValue("totalizer_1_val_at_midnight");
var atMidnightHistory = getChannelHistory("totalizer_1_val_at_midnight", -1 * daysToSeconds(2), 0)
var valAtMidnight = parseFloat(atMidnight.Value);
var atMidnightDate = new Date(atMidnight.Timestamp * 1000);
var payloadDate = new Date(payload.Timestamp * 1000);
if ((atMidnightHistory.length < 1) || (atMidnightDate.getDate() !== payloadDate.getDate())){
  if (!isNaN(valAtMidnight)){
  	sendChannelValue('totalizer_1_yesterday', parseFloat(payload.Value) - valAtMidnight, payload.Timestamp);
  }
  sendChannelValue('totalizer_1_val_at_midnight', parseFloat(payload.Value), payload.Timestamp);
	valAtMidnight = parseFloat(payload.Value);
}
var valToday = parseFloat(payload.Value) - valAtMidnight;
sendChannelValue('totalizer_1_today', valToday, payload.Timestamp);