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

const byte ROWS = 4;
const byte COLS = 3;

char keys[ROWS][COLS] ={
  {'1','2','3','U'},
  {'4','5','6','D'},
  {'7','8','9','L'},
  {'#','0','*','R'}
};

byte rowPins[ROWS] = {5,4,3,2}; 
byte colPins[COLS] = {9,8,7,6}; 
Keypad keypad = Keypad( makekeymap(keys), rowPins, colPins,ROWS,COLS);

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

void setup() {
  Serial.begin(9600);
  Wire.begin();
  RTC.begin();
  RTC.adjust(DateTime(2023,1,11,16,16,16));
  lcd.init();
  lcd.backlight();
  while(1)
  {
    SetTime();
  }
  }

void loop() {
  DateTime now = RTC.now();
  lcd.setCursor(3,0);
  lcd.print(now.year());
  lcd.print('-');
  lcd.print(now.month());
  lcd.print('-');
  lcd.print(now.day());

  lcd.setCursor(4,1);
  lcdData(now.hour());
  lcd.print(':');
  lcdData(now.minute());
  lcd.print(':');
  lcdData(now.second());
}

void lcdData(uint8_t data)
{
  if(data<10)
  {
    lcd.print(0);
    lcd.print(data);
  }
    else
    {
      lcd.print(data);
    }
}

void SetTime()
{
  lcd.setCursor(3,0);
  lcd.print("___-___-___");
  lcd.setCursor(4,1);
  lcd.print("__:__:__");
  lcd.setCursor(3,0);
  while(1)
  {
    CursorTwink(3,0);
  }
}

void CursorTwink(uint8_t col, uint8_t row)
{
  lcd.setCursor(col, row);
  lcd.print(' ');
  delay(100);
  lcd.setCursor(col, row);
  lcd.print('_');
}