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

const int buttonPin = 2;
int buttonState = 0;      
bool lcdOn = true;        

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

void setup() {
  Serial.begin(9600);
  RTC.begin();
  lcd.init();
  lcd.backlight();
  pinMode(buttonPin, INPUT_PULLUP);  

  if (!RTC.begin()) {
    Serial.println("Tidak dapat menemukan RTC");
    while (1);
  }

  if (!RTC.isrunning()) {
    Serial.println("RTC tidak berjalan");
    RTC.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
}

void loop() {
  buttonState = digitalRead(buttonPin);

  if (buttonState == LOW) {
    lcdOn = !lcdOn;
    delay(500);

    if (lcdOn) {
      lcd.backlight();  
    } else {
      lcd.noBacklight();  
      lcd.clear();        
    }
  }

  if (lcdOn) {
    DateTime now = RTC.now();
    
    lcd.setCursor(0, 0);
    lcd.print("Date: ");
    lcd.print(now.day());
    lcd.print("/");
    lcd.print(now.month());
    lcd.print("/");
    lcd.print(now.year());

    lcd.setCursor(0, 1);
    lcd.print("Time: ");
    lcd.print(now.hour());
    lcd.print(":");

    if (now.minute() < 10) {  
      lcd.print("0"); }
    lcd.print(now.minute());
    lcd.print(":");
    
    if (now.second() < 10) {  
      lcd.print("0"); }
    lcd.print(now.second());
  }
}