Shows time and date data in the format of day of week, month, day of month, year, hour:minute:second using a Wi-Fi connection and NTP servers

ntp_time.ino

#include <WiFi.h>

#include "time.h"

const char* ssid = "SSID";
const char* password = "password";

const char* ntpServer = "pool.ntp.org";
// Default time from NTP is GMT. Replace with your timezone offset. Expected to be measured in seconds.
// 3600 seconds in 1 hour. CDT is 5 hours behind GMT. 3600 * 5 = 18,000.
// Since it is 5 hours behind, we make this number negative.
const long gmtOffset_sec = -18000;
const int daylightOffset_sec = 0;

void printLocalTime() {
    struct tm timeinfo;
    if (!getLocalTime(&timeinfo)) {
        Serial.println("Failed to obtain time");
        return;
    }
    Serial.println(&timeinfo, "%A, %B %d %Y %H:%M:%S");
}

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

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

    // init and get time
    configTime(cdtOffset_sec, daylightOffset_sec, ntpServer);
    printLocalTime();

    // disconnect WiFi as it's no longer needed
    WiFi.disconnect(true);
    WiFi.mode(WIFI_OFF);
}

void loop() {
    delay(1000);
    printLocalTime();
}