Auto daylight saving switch

[peter-tue]

Hello together,

I noticed that in snapshot 2.2.093 a checkbox is added for daylight saving setting (ohAnd) and thought an automatic in-time switching would be helpful. This could be the code with ntpAutoDLS() to be called in 1 or some minutes intervals in the DTUgateway loop.

`// Function that gets current system epoch time
// timeinfo is public
struct tm timeinfo;
unsigned long getTime() {
time_t now;
if (!getLocalTime(&timeinfo)) {
Serial.println("Failed to obtain time");
return(0);
}
time(&now);
return now;
}

//// ntp time - offset in summertime 7200 else 3600
int lastCheckedDay = 0;
int lastCheckedHrs = 0;
int changeHrs = 0;

bool checkLastSunday(int month){
unsigned long curEpoch = getTime();
curEpoch += 7 * 24 * 60 * 60; // add one week
//https://www.epochconverter.com/programming/c
time_t rawtime = curEpoch;
struct tm ts;
ts = *localtime(&rawtime);
Serial.println("checkLastSunday (month + new month): " + String(month) + " new " + String(ts.tm_mon));
return (month != ts.tm_mon );
}

//--------------------------------------------------------------------------
// Auto daylight saving time switching:
void ntpAutoDLS(){
unsigned long curEpoch = getTime(); // if not already previously called to get actual timeinfo
if (timeinfo.tm_mday != lastCheckedDay){
lastCheckedDay = timeinfo.tm_mday;

if(7200 == userConfig.timezoneOffest){    	// if currently daylight_Saving - summer
  if((9 == timeinfo.tm_mon) && (0 == timeinfo.tm_wday)){    //month = timeinfo.tm_mon + 1; - Oct // && Sunday
    if (checkLastSunday(timeinfo.tm_mon))
      changeHrs = 3;
  } 

}else{                                        // is normal time - winter
  if((2 == timeinfo.tm_mon) && (0 == timeinfo.tm_wday)){    //month = timeinfo.tm_mon + 1; - Mar // && Sunday
    if (checkLastSunday(timeinfo.tm_mon))
      changeHrs = 2;
  } 

}

}
if ( 0 != changeHrs){
if( lastCheckedHrs != timeinfo.tm_hour){
lastCheckedHrs = timeinfo.tm_hour;

   if(changeHrs == timeinfo.tm_hour){

    switch (changeHrs)
    {
    case 2:
      userConfig.timezoneOffest = 7200;   // switch @ 02:00 to summer time
      break;
    case 3:
      userConfig.timezoneOffest = 3600;   // switch @ 03:00 to winter time
      break;
    
    default:
      break;
    }

    changeHrs = 0;
    // To Do !
    // update config file
    // update NTP time
    //timeClient.setTimeOffset(userConfig.timezoneOffest);
    //timeClient.update();
    // ?platformData.dtuGWstarttime = timeClient.getEpochTime();
   }

}

}

}`

What do you think ?

[ohAnd]

;-)

there is no switch it is an automatic setting based on the configured timezone.

see 16a7adc

and https://github.com/ohAnd/dtuGateway/tree/develop?tab=readme-ov-file#timezone-configuration
in the new readme (currently in develop branch)

[peter-tue]

@ohAnd
Thanks, I'll have a look at the new snapshot code.