Teste.ino

unsigned long teste;

void setup(){
Serial.begin(115200);
}


void loop(){
teste = (((unsigned long)2023 * (unsigned long)1000000) + ((unsigned long)12 * (unsigned long)10000));

Serial.print ("teste: ");
Serial.println (teste);
Serial.println ("certo: 2023120000");
Serial.println();

delay(5000);
}