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

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

// create an OLED display object connected to I2C
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);


RTC_DS1307 RTC;

int hourupg;
int minupg;
int secupg;
int yearupg;
int monthupg;
int dayupg;
int hrupg;
int mnupg;

void setup () {
  Serial.begin(9600);
  RTC.begin();  
  if (! RTC.isrunning()) {
    //Serial.println("RTC is NOT running!");
    RTC.adjust(DateTime(__DATE__, __TIME__));// Set the date and time at compile time
  }
  // automatically sets the RTC to the date & time on PC this sketch was compiled
  RTC.adjust(DateTime(F(__DATE__), F(__TIME__)));
   
   // initialize OLED display with I2C address 0x3C
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }

  delay(2000);         // wait two seconds for initializing
  oled.clearDisplay(); // clear display

}


void loop () {
  DateTime now = RTC.now();
  Serial.println("ESP32 RTC Date Time: ");
  displayDateTime ();

  oled.setTextSize(1);         // set text size
  oled.setTextColor(WHITE);    // set text color
  oled.setCursor(0, 2);       // set position to display (x,y)
  oled.println("Hello World"); // set text
  oled.display();              // display on OLED

  delay(1000); // delay 1 seconds
}

/*===================================================================================================*/

void displayDateTime () {           //    //display the current date and time     //      

  DateTime now = RTC.now(); 

  Serial.print(now.hour(), DEC);
  hourupg = now.hour();
  Serial.print(":");

  Serial.print(now.minute(), DEC);
  minupg = now.minute();
  Serial.print(":");

  Serial.print(now.second(), DEC);
  secupg = now.second();

  Serial.println(now.month(), DEC);  
  monthupg=now.month();
  Serial.print("/");

  Serial.print(now.day(), DEC);  ////display Day
  dayupg = now.day();
  Serial.print("/");

  Serial.println(now.year(), DEC); ////display Year
  yearupg = now.year(); 
 Serial.print("");

  } // EOF void //displayDateTime
/*----------------------------------------------------------------------------------------------------------------------------*/