#include "RTClib.h"
RTC_DS1307 rtc;

void setup() {
  Serial.begin(115200);
  Serial.println("Start");
  rtc.begin();
}

void loop() {
  DateTime now = rtc.now();
  int day = now.day();
  int month = now.month();
  int year = now.year();

  String str = Serial.readString();
  str.remove(str.length()-1); 
  if (str == "date") {
    showDate(day, month, year);
  }
}

void showDate(int day, int month, int year) {
  Serial.print(day);
  Serial.print(".");
  Serial.print(month);
  Serial.print(".");
  Serial.print(year);
  Serial.println();
}