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

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

void setup () {
  Serial.begin(9600);

  // Check if the RTC is connected
  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }
  
  lcd.init();
  lcd.clear();
}

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

  String time = addLeftZero(now.hour()) + ":" + addLeftZero(now.hour());
  lcd.print("Current time:");
  lcd.setCursor(0, 1);
  lcd.print(time);
  
  delay(3000);
  lcd.clear();
  lcd.setCursor(0, 0);
}

String addLeftZero(int value) {
  if (value < 10) {
    return "0"+String(value);
  }
  return String(value);
}