#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>
#include <RTClib.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

RTC_DS1307 rtc;

void setup() {
  // Initialize the OLED display
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  // Initialize the RTC module
  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  // Set the time if the RTC module has lost power and is restarted
  if (rtc.now().year() < 2021) {
  rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
}

  // Set the font size and color for the display
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
}

void loop() {
  DateTime now = rtc.now();

  // Clear the display
  display.clearDisplay();

  // Print the date
  display.setCursor(0, 0);
  display.println("TIME");
 
  display.setCursor(0, 10);
  display.print(now.hour(), DEC);
  display.print(':');

  if (now.minute() < 10) {
    display.print('0');
  }
  display.print(now.minute(), DEC);
  display.print(':');

  if (now.second() < 10) {
    display.print('0');
  }
  display.print(now.second(), DEC);

   // Print the time
  display.setCursor(0, 30);
  display.println("DATE");

  display.setCursor(0, 40);
  display.print(now.month(), DEC);
  display.print('.');
  display.print(now.day(), DEC);
  display.print('.');
  display.print(now.year(), DEC);
  
  // Display the content on the OLED display
  display.display();
  // Delay for one second
  delay(1000);
}