#include "RTClib.h"
RTC_DS1307 rtc;
char daysOfTheWeek[7][12] = {"Dimanche", "Lundi", "Mardi", "Mercredi", "Jeudi", "Vendredi", "Samedi"};

#include <LiquidCrystal_I2C.h>
#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

void setup () {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(2, 1);
  lcd.print("/  /");
  lcd.setCursor(2, 2);
  lcd.print(":  :");
  if (! rtc.begin()) {
    Serial.println("RTC absent");
    Serial.flush();
    abort();
  }
}

void loop () {
  DateTime now = rtc.now();
  Serial.print("Date & Heure : ");
  Serial.print(now.day(), DEC);
  Serial.print('/');
  Serial.print(now.month(), DEC);
  Serial.print('/');
  Serial.print(now.year(), DEC);
  Serial.print(" (");
  Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
  Serial.print(") ");
  Serial.print(now.hour(), DEC);
  Serial.print(':');
  Serial.print(now.minute(), DEC);
  Serial.print(':');
  Serial.print(now.second(), DEC);
  Serial.println();

  lcd.setCursor(0, 0);
  lcd.print(daysOfTheWeek[now.dayOfTheWeek()]);
  lcd.setCursor(0, 1);
  lcd.print(now.day());
  lcd.setCursor(3, 1);
  lcd.print(now.month());
  lcd.setCursor(6, 1);
  lcd.print(now.year());
  lcd.setCursor(0, 2);
  lcd.print(now.hour());
  lcd.setCursor(3, 2);
  lcd.print(now.minute());
  lcd.setCursor(6, 2);
  lcd.print(now.second());

  delay(5000);
}