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

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

char daysOfTheWeek[7][4] = {
  "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};

void setup () {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }
}

void loop () {
  char buffer[16];
  DateTime now = rtc.now();

  Serial.print("Current time: ");
  Serial.print(now.year(), DEC);
  Serial.print('/');
  Serial.print(now.month(), DEC);
  Serial.print('/');
  Serial.print(now.day(), 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();

  snprintf(buffer, 16, "%02d:%02d:%02d",
           now.hour(), now.minute(), now.second());
  lcd.setCursor(4, 0);
  lcd.print(buffer);
  snprintf(buffer, 16, "%s, %d/%d/%d",
           daysOfTheWeek[now.dayOfTheWeek()],
           now.month(), now.day(), now.year());
  lcd.setCursor(1, 1);
  lcd.print(buffer);

  Serial.println();
  delay(1000);
}