#include <Wire.h>
#include <RTClib.h>
#include <LiquidCrystal_I2C.h>
RTC_DS1307 RTC;
LiquidCrystal_I2C(0x27,16,2);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Wire.begin();
  RTC.begin();
  RTC.adjust(DateTime(2022,6,6,6,6,6));
  lcd.init();
  lcd.backlight();
}

void loop() {
  DateTime now=RTC.now;
  lcd.setCursor(3,0);
  lcd.print(now.year());
  lcd.print('-');
  lcdData(now.month());
  lcd.print('-');
  lcdData(now.day());
  lcd.setCursor(4,1);
  lcd.print(now.hour());
  lcd.print(':');
  lcdData(now.minute());
  lcd.print(':');
  lcdData(now.second());
}

void lcdData(unsigned int data)
{
  if(data<10)
  {
    lcd.print(0);
    lcd.print(data);
  }
  else
    lcd.print(data);
}