How to read current time from internet using ESP8266?

Example sketches for the new Arduino IDE for ESP8266

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Re: How to read current time from internet using ESP8266?

By torntrousers
- Fri Oct 16, 2015 5:18 am #31503
sushma wrote:Can I have complete program?

Code: Select all#include <ESP8266WiFi.h>

const char* ssid = "<yourWiFiSSID>";
const char* password = "<yourWiFiPswd>";

void setup() {
  Serial.begin(115200);
  Serial.println();
  initWifi();
}

void loop() {
  Serial.println(getTime());
  delay(5000);
}
 
String getTime() {
  WiFiClient client;
  while (!!!client.connect("google.com", 80)) {
    Serial.println("connection failed, retrying...");
  }

  client.print("HEAD / HTTP/1.1\r\n\r\n");
 
  while(!!!client.available()) {
     yield();
  }

  while(client.available()){
    if (client.read() == '\n') {   
      if (client.read() == 'D') {   
        if (client.read() == 'a') {   
          if (client.read() == 't') {   
            if (client.read() == 'e') {   
              if (client.read() == ':') {   
                client.read();
                String theDate = client.readStringUntil('\r');
                client.stop();
                return theDate;
              }
            }
          }
        }
      }
    }
  }
}

void initWifi() {
   Serial.print("Connecting to ");
   Serial.print(ssid);
   if (strcmp (WiFi.SSID(),ssid) != 0) {
      WiFi.begin(ssid, password);
   }

   while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.print(".");
   }
  Serial.print("\nWiFi connected, IP address: ");
  Serial.println(WiFi.localIP());
}

That is for an ESP8266 running the native Arduino core which might not be quite what you want because above you mentioned using AT commands and having the ESP connected to an Uno. From a quick Google there is an example of using this approach of getting the time from the HTTP Date header using ESP AT commands here.
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