Time Connundrum

Projects Programming
1

I am trying to turn on and off the heaters in three zones, Office, Lounge and Bedroom.

  int officeStart = ( 7 * 60) + 0;    //  7:00am ON
  int officeStop =  (15 * 60) + 0;    //  3:00pm OFF
  int loungeStart = (15 * 60) + 45;   //  3:45pm ON
  int loungeStop =  (21 * 60) + 15;   //  9:15pm OFF
  int bedroomStart =(21 * 60) + 0;    //  9:00pm ON
  int bedroomStop = ( 6 * 60) + 0;    //  6:00am OFF  <<-- PROBLEM as next day

void Loop ()
{
     RTC.read(tm);
      int tempMins = (tm.Hour * 60) + tm.Minute;
      if (tempMins >= officeStart && tempMins <= officeStop)
        relaySwitchOn(idxOffice); else
        relaySwitchOff(idxOffice);
      if (tempMins >= loungeStart && tempMins <= loungeStop)
        relaySwitchOn(idxLounge);
        relaySwitchOff(idxLounge);
      if (tempMins >= bedroomStart && tempMins <= bedroomStop)
        relaySwitchOn(idxBedroom);
        relaySwitchOff(idxBedroom);

The problem is that bedroomStart = 1260 and bedroomEnd = 360 the next morning

How do I define a Stop time that can be less than the Start time? Not just for the bedroom, but the other two zones also? This will eventually include the A/C for Summer cooling so several zones could stretch across Midnight.

Thanks

3

Define "0 midnight to 7am" as a time period, and "6PM to 24:00 midnight" as a time period.

To stop the relay flicking off and on again at midnight, the logic is "does my relay need to be on or off? Is it on or off now? If the two are different, set the relay".

So just before midnight, the relay is on because rule 2; and just after, it's on because rule 1. But the logic will go "ok, relay needs to be on, and it is on, so meh".