So, meine INTs werden nun folgendermaßen umgewandelt:
Code:
    unsigned long days2 = (unsigned long) EEPROM.read(4);
    days2 *= 86400;
    
    unsigned long hours2 = (unsigned long) EEPROM.read(5);
    hours2 *=3600;
    
    unsigned long minutes2 = (unsigned long) EEPROM.read(6);
    minutes2 *= 60;

    unsigned long temptime1 = days2 + hours2 + minutes2;
    
    intervall0 = reinterpret_cast <time_t> (temptime1);