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

#define SERIAL_OPTION 0

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

void setup() {
  Wire.begin();
  
  if (SERIAL_OPTION) Serial.begin(9600);

  lcd.init();
  lcd.backlight();

  RTC.begin();

  RTC.adjust(DateTime(2023, 1, 9, 18, 13, 40));
  // DateTime(year, month, day, hour, minute, second);
}

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

  if (SERIAL_OPTION) {
    Serial.print(now.year()); Serial.print("/");
    Serial.print(now.month()); Serial.print("/");
    Serial.print(now.day()); Serial.print(" ");

    Serial.print(now.hour()); Serial.print(":");
    Serial.print(now.minute()); Serial.print(":");
    Serial.print(now.second()); Serial.print("\n");
  }

  lcd.setCursor(0, 0);
  lcd.print("DATE: ");
  lcd.print(now.year()); lcd.print("/"); lcd.print(now.month()); lcd.print("/"); lcd.print(now.day());
  lcd.setCursor(0, 1);
  lcd.print("TIME: ");
  lcd.print(now.hour()); lcd.print(":"); lcd.print(now.minute()); lcd.print(":"); lcd.print(now.second());

  delay(1000);
}