#include "esp_system.h"
#include "sntp.h"
#include "time.h"
#include <WiFi.h>
#include <WiFiUdp.h>

const char* ssid       = "Wokwi-GUEST";
const char* password   = "";

const char* ntpServer1 = "pool.ntp.org";
const char* ntpServer2 = "time.nist.gov";
const long  gmtOffset_sec = 2 * 3600;  // GMT + 2
const int   daylightOffset_sec = 0;

void printLocalTime()
{
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)){
    Serial.println("No time available (yet)");
    return;
  }
  Serial.println(&timeinfo, "%A, %B %d %Y %H:%M:%S");
}

// Callback function (get's called when time adjusts via NTP)
void timeavailable(struct timeval *t)
{
  Serial.println("Got time adjustment from NTP!");
  printLocalTime();
}

void setup()
{
  Serial.begin(115200);

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

  // This will set configured NTP servers and the new GMT and daylight offsets for IST.
  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer1, ntpServer2);

  // Connect to WiFi
  Serial.printf("Connecting to %s ", ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println(" CONNECTED");
}

void loop()
{
  delay(5000);
  printLocalTime();     // it will take some time to sync time :)
}