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

RTC_DS1307 rtc;
LiquidCrystal_I2C lcd(0x27, 16, 2); // Address 0x27, 16 chars, 2 lines

void setup() {
  Wire.begin();
  lcd.begin(16, 2);
  lcd.backlight();

  if (!rtc.begin()) {
    lcd.print("Couldn't find RTC");
    while (1);
  }

  if (!rtc.isrunning()) {
    lcd.clear();
    lcd.print("RTC is NOT running");
    // Uncomment to set time to compile time
    // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  lcd.clear();
  lcd.print("Digital Clock");
  delay(2000);
  lcd.clear();
}

void loop() {
  DateTime now = rtc.now();

  char timeBuffer[9]; // HH:MM:SS
  sprintf(timeBuffer, "%02d:%02d:%02d", now.hour(), now.minute(), now.second());

  lcd.setCursor(0, 0);
  lcd.print("Time:");
  lcd.setCursor(6, 0);
  lcd.print(timeBuffer);

  char dateBuffer[11]; // DD/MM/YYYY
  sprintf(dateBuffer, "%02d/%02d/%04d", now.day(), now.month(), now.year());
  
  lcd.setCursor(0, 1);
  lcd.print("Date:");
  lcd.setCursor(6, 1);
  lcd.print(dateBuffer);

  delay(1000);
}