#include <LiquidCrystal_I2C.h>
#include "RTClib.h"
 LiquidCrystal_I2C lcd(0x27, 16, 2);  
 RTC_DS1307 rtc;
 void setup() {
  lcd.init();
  lcd.backlight();
  rtc.begin();
 }
 void loop() {
 DateTime now = rtc.now();
  // แปลงคริสตศักราชเป็นพุทธศักราชโดยบวก 543
  int xYear = now.year() + 543;
  // แสดงวันที่
  lcd.setCursor(0, 0);
  lcd.print("Date:");
  lcd.print(String(now.day(), DEC).length() == 1 ? "0" : "");
  lcd.print(now.day(), DEC);
  lcd.print('/');
  lcd.print(String(now.month(), DEC).length() == 1 ? "0" : "");
  lcd.print(now.month(), DEC);
  lcd.print('/');
  lcd.print(xYear, DEC); // แสดงปีพุทธศักราช
  lcd.print(' ');
  // แสดงเวลา
  lcd.setCursor(0, 1);
  lcd.print("Time:");
  lcd.print(String(now.hour(), DEC).length() == 1 ? "0" : "");
  lcd.print(now.hour(), DEC);
  lcd.print(':');
  lcd.print(String(now.minute(), DEC).length() == 1 ? "0" : "");
  lcd.print(now.minute(), DEC);
  lcd.print(':');
  lcd.print(String(now.second(), DEC).length() == 1 ? "0" : "");
  lcd.print(now.second(), DEC);
 }