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

RTC_DS1307 rtc;
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Wire.begin();
  lcd.init();
  lcd.backlight();
  rtc.begin();
}

void loop() {
  DateTime now = rtc.now();
  
  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  printDigits(now.hour());
  lcd.print(':');
  printDigits(now.minute());
  lcd.print(':');
  printDigits(now.second());
  
  lcd.setCursor(0, 1);
  lcd.print("Date: ");
  printDigits(now.day());
  lcd.print('/');
  printDigits(now.month());
  lcd.print('/');
  lcd.print(now.year());
  
  delay(1000);
}

void printDigits(int digits) {
  if (digits < 10) {
    lcd.print('0');
  }
  lcd.print(digits);
}