#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>

RTC_DS3231 rtc;

LiquidCrystal_I2C lcd(0x27, 16, 2); // Change the I2C address if needed

void setup() {
  // put your setup code here, to run once:
  lcd.begin(16,2);
  lcd.backlight();

  if(!rtc.begin()){
    lcd.print("Couldn`t find RTC");
    while(1);
  }

  if(rtc.lostPower()){
    lcd.print("RTC lost power, let's set the time!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  DateTime now = rtc.now();

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Time: ");
  lcd.print(formatDigits(now.hour()));
  lcd.print(":");
  lcd.print(formatDigits(now.minute()));
  lcd.print(":");
  lcd.print(formatDigits(now.second()));

  lcd.setCursor(0, 1);
  lcd.print("Date: ");
  lcd.print(formatDigits(now.day()));
  lcd.print("/");
  lcd.print(formatDigits(now.month()));
  lcd.print("/");
  lcd.print(now.year());

  delay(1000);  //  Update every second
}

String formatDigits(int digits){
  if(digits < 10){
    return "0" + String(digits);
  }else{
    return String(digits);
  }
}