// Arduino DS3232RTC Library
// https://github.com/JChristensen/DS3232RTC
//
// Example sketch illustrating Time library with Real Time Clock.
// This example is similar to the example provided with the Time Library.
// The #include statement has been changed to include the DS3232RTC library,
// a DS3232RTC object has been defined (myRTC) and the begin() method is called.

#include <DS3232RTC.h>      // https://github.com/JChristensen/DS3232RTC
byte Sommerzeit=0;
DS3232RTC myRTC;

void setup()
{
    Serial.begin(115200);
    myRTC.begin();
    setSyncProvider(myRTC.get);   // the function to get the time from the RTC
    if(timeStatus() != timeSet)
        Serial.println("Unable to sync with the RTC");
    else
        Serial.println("RTC has set the system time");


set_sommerzeit();
}

byte oktober[5]={30,29,27,30,29};
byte maerz[5]={27,26,29,26,25};
int akt_jahr=2022;
byte j=0;
void set_sommerzeit()
{
for (byte y=0; y<=5; y++)
{
  if(akt_jahr+y==year())
  {
    j=y;
  }
}

if(year())
          if(month()<3 && month()>10) // Prüfung nach Monate außerhalb der Umstellung
            {
              Sommerzeit=1;
            }
            else
            {
              // Umstellung im  März
            if(month()==3 && day()>=maerz[j])
            {
              Sommerzeit=1;
            }
            //Umstellung im Oktober
            if(month()==10 && day()>=oktober[j])
            {
              Sommerzeit=1;;
            }
        }
}

void loop()
{
    digitalClockDisplay();
    delay(1000);
}

void digitalClockDisplay()
{
    // digital clock display of the time
    Serial.print(hour()-Sommerzeit);
    printDigits(minute());
    printDigits(second());
    Serial.println();
    Serial.println(weekday());

}

void printDigits(int digits)
{
    // utility function for digital clock display: prints preceding colon and leading 0
    Serial.print(':');
    if(digits < 10)
        Serial.print('0');
    Serial.print(digits);
}