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

LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display
#include <Wire.h>
#include <I2C_RTC.h>

static DS1307 RTC;
char* week[] = {"SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};

void setup()
{
  Serial.begin(9600);
  lcd.init();        
  lcd.backlight();
  RTC.begin();

  RTC.setHourMode(CLOCK_H24);
  /*RTC.setWeek(2);
  RTC.setDate(28,8,23);
  RTC.setTime(23,29,00);*/
}

void loop()
{
  // Menampilkan tanggal di serial monitor
  Serial.print(week[RTC.getWeek()]);
  Serial.print(",");
  
  if(RTC.getDay() < 10) 
  {
    Serial.print("0");
  }
  Serial.print(RTC.getDay());
  Serial.print("-");

  if(RTC.getMonth() < 10) 
  {
    Serial.print("0");
  }
  Serial.print(RTC.getMonth());
  Serial.print("-");

  Serial.print(RTC.getYear());
  Serial.print(" ");


  // Menampilkan tanggal di LCD
  lcd.setCursor(3,0);
  lcd.print(week[RTC.getWeek()]);
  lcd.print(",");
  if(RTC.getDay() < 10) 
  {
    lcd.print("0");
  }
  lcd.print(RTC.getDay());
  lcd.print("-");

  if(RTC.getMonth() < 10) 
  {
    lcd.print("0");
  }
  lcd.print(RTC.getMonth());
  lcd.print("-");
  lcd.print(RTC.getYear());


  // Menampilkan waktu di serial monitor
  if(RTC.getHours() < 10) 
  {
    Serial.print("0");
  }
  Serial.print(RTC.getHours());
  Serial.print(":");

  if(RTC.getMinutes() < 10) 
  {
    Serial.print("0");
  }
  Serial.print(RTC.getMinutes());
  Serial.print(":");

  if(RTC.getSeconds() < 10) 
  {
    Serial.print("0");
  }
  Serial.print(RTC.getSeconds());
  Serial.println(" ");

  // Menampilkan waktu di LCD
  lcd.setCursor(6,1);
  if(RTC.getHours() < 10) 
  {
    lcd.print("0");
  }
  lcd.print(RTC.getHours());
  lcd.print(":");

  if(RTC.getMinutes() < 10) 
  {
    lcd.print("0");
  }
  lcd.print(RTC.getMinutes());
  lcd.print(":");

  if(RTC.getSeconds() < 10) 
  {
    lcd.print("0");
  }
  lcd.print(RTC.getSeconds());
}