ESP 32 Based Cyber Clock. (My first Project)

#include <Wire.h> 
#include <U8g2lib.h> // Need this to make displays do things and stuff.
#include <WiFi.h>
#include "time.h"
#include "esp_sntp.h"
#include <DFRobot_DHT11.h>
DFRobot_DHT11 DHT;
U8G2_SH1106_128X64_NONAME_F_HW_I2C DISP(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);                                                                              

#define SDA 21  //SDA set to pin 21
#define SCL 22  //SCL set to pin 22
#define DHT11_PIN 2 //DHT11 set to pin 10

const char *ssid = "Wifi_ssid"; //Insert the ssid here
const char *password = "*Wifi_password";//Insert the password here

const char *ntpServer1 = "pool.ntp.org";
const char *ntpServer2 = "time.nist.gov";
const long gmtOffset_sec = (3600*5)+(30*60);
const int daylightOffset_sec = 0;

const char *time_zone = "CET-1CEST,M3.5.0,M10.5.0/3";  // TimeZone rule for Europe/Rome including daylight adjustment rules (optional)



void setup() {
  Serial.begin(115200);
 
  // First step is to configure WiFi STA and connect in order to get the current time and date.
  Serial.printf("Connecting to %s ", ssid);
  WiFi.begin(ssid, password);

  /**
   * NTP server address could be acquired via DHCP,
   *
   * NOTE: This call should be made BEFORE esp32 acquires IP address via DHCP,
   * otherwise SNTP option 42 would be rejected by default.
   * NOTE: configTime() function call if made AFTER DHCP-client run
   * will OVERRIDE acquired NTP server address
   */
  esp_sntp_servermode_dhcp(1);  // (optional)

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
   DISP.clearBuffer();
     DISP.setFont(u8g2_font_unifont_tf );
    DISP.setCursor(2, 42);
    DISP.print("CONNECTED");
    DISP.sendBuffer();
  Serial.println(" CONNECTED");

  // set notification call-back function
  sntp_set_time_sync_notification_cb(timeavailable);

  /**
   * This will set configured ntp servers and constant TimeZone/daylightOffset
   * should be OK if your time zone does not need to adjust daylightOffset twice a year,
   * in such a case time adjustment won't be handled automagically.
   */
  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer1, ntpServer2);

  /**
   * A more convenient approach to handle TimeZones with daylightOffset
   * would be to specify a environment variable with TimeZone definition including daylight adjustmnet rules.
   * A list of rules for your zone could be obtained from https://github.com/esp8266/Arduino/blob/master/cores/esp8266/TZ.h
   */
  //configTzTime(time_zone, ntpServer1, ntpServer2);
  // Setting the pins that control the displays to all outputs.
  pinMode(SDA, OUTPUT);  
  pinMode(SCL, OUTPUT);


  // Set I2C bus speed on Arduino and both displays. This may not be necessary
  // but I put it in anyway - one less thing to troubleshoot if things don't work.
  Wire.setClock(100000);
  DISP.setBusClock(100000);

  // Some devices say they're 0x78/0x7A, but others may say they're 0x3C/0x3D. It's
  // like that because the address is 7 bits but some places (u8g2 included) pad it
  // out to 8 bits. Adding a 0 on the end multiplies the value by 2.
  // Most of the small OLED displays out there seem to be set to 0x3C(0x78). Some
  // can be changed, but not all of them.
  // See https://www.arduino.cc/en/Reference/Wire for details.
  DISP.setI2CAddress(0x78);
  
  // Fire up the displays and get them ready to accept data.
                            
  DISP.begin();
  //DISP.clearBuffer(); 

}
void printLocalTime() {
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    DISP.clearBuffer();
     DISP.setFont(u8g2_font_unifont_tf );
    DISP.setCursor(1, 35);
    DISP.print("Time Unavailable");
    DISP.sendBuffer();
    Serial.println("No time available (yet)");
    return;
  }
   DISP.clearBuffer();  // Let's put some writing on DISPA. Make sure the display buffer is clear before writing or drawing anything.
    DISP.setFont(u8g2_font_logisoso20_tf ); // you can change font throughout the program, too. Check https://github.com/olikraus/u8g2/wiki for others, there are LOTS.
    DISP.setCursor(2, 22); // Move the starting position of what will be written/drawn next tox and y coordinate.
    DISP.print(&timeinfo, "%H:%M:%S");
    DISP.setFont(u8g2_font_unifont_tf );
    DISP.setCursor(2, 42);
    DISP.print(&timeinfo, "%A");
    DISP.setFont(u8g2_font_unifont_tf );
    DISP.setCursor(2, 62);
    DISP.print(&timeinfo, "%B %d");
     DISP.setFont(u8g2_font_logisoso16_tf ); 
    DISP.setCursor(75, 46); 
    DISP.print("|");
    DISP.setFont(u8g2_font_logisoso16_tf ); 
    DISP.setCursor(75,62 ); 
    DISP.print("|");
     DISP.setFont(u8g2_font_unifont_tf );
    DISP.setCursor(87,42);
    DISP.print(DHT.temperature);
     DISP.setFont(u8g2_font_unifont_tf );
    DISP.setCursor(104,42);
    DISP.print("C");
    DISP.setFont(u8g2_font_unifont_tf );
    DISP.setCursor(87, 62);
     DISP.print(DHT.humidity);
      DISP.setFont(u8g2_font_unifont_tf );
    DISP.setCursor(104, 62);
     DISP.print("%");
    DISP.sendBuffer();
  Serial.println(&timeinfo, "%A");
  Serial.println(&timeinfo, "%B %d");
  Serial.println(&timeinfo, "%H:%M:%S");
//  %B %d %H:%M:%S"); 
}

// Callback function (gets called when time adjusts via NTP)
void timeavailable(struct timeval *t) {
  Serial.println("Got time adjustment from NTP!");
  printLocalTime();
}
void loop() {

    printLocalTime();
    DHT.read(DHT11_PIN);
Serial.println(DHT.humidity);
Serial.println(DHT.temperature);
  delay(1000);
    // it will take some time to sync time :)
}