In this tutorial I have installed NTPClient library by Taranais because it is easy to use and have functions to get date and time from NTP servers. Each stratum in the hierarchy synchronizes to the stratum above and act as servers for lower stratum computers.

An NTPClient to connect to a time server. is an open NTP project great for things like this. I don'y want to use library like Arduino or something else. So  define the variables for OLED pins connected to NodeMCU for SPI communication.   Serial.println(timeClient.getFormattedTime());

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To make the watch project more beautiful and practical with NTP, we display it on a 0.96 ”I2C OLED display.     hh=hh-12;

Let’s take a quick look at the code to see how it works.

5 months ago For better accuracy choose the address of NTP servers which are close to your geographical area.

You can access the date & time information by accessing members of this time structure. Once ESP32 is connected to the network, we initialize the NTP client using configTime() function to get date and time from an NTP server. In this tutorial we’ll see how to get time using the ESP8266/nodemcu with Arduino IDE. ElectroPeak Inc. © 2019. It’s a standard Internet Protocol (IP) for synchronizing the computer clocks to some reference over a network.     display.print(mm);

#include // provides ESP8266 specific Wi-Fi routines we are calling to connect to network ByAbhishek Bakolia

NTP is one of the oldest networking Internet Protocol (IP) for synchronizing clocks between computer networks.

To install it go to Sketch > Include Library > Add .ZIP Library, then open the Zip folder by going to the location where you have downloaded the zip folder and restart the Arduino IDE. In the Keywords getFormattedTime is listed, but not getFormattedDate. on Introduction, Hello,I want to get the date and time using NTP. In this tutorial we’ll see how to get time using the ESP8266/nodemcu with Arduino IDE.

print("Unable to get time and date from the")

If you need greater precision, you may want to use an NTP client for Arduino.

  display.println("  CIRCUIT"); Unzip the .zip folder and you should get NTPClient-master folder 3. Modify the utcOffsetInSeconds variable according to your location, you can find your country’s UTC coefficient here. Complete code is available at the end of this tutorial, here I have explained few important part of the code. Re: Three methods of obtaining the date and time #43744. We just need a Wi-Fi module and access to internet to get time of any location in the world by using NTP servers. The protocol can be used to synchronize all networked devices to Coordinated Universal Time (UTC) within a few milliseconds ( 50 milliseconds over the public Internet and under 5 milliseconds in a LAN environment).

ESP8266WiFi library provides ESP8266 specific Wi-Fi routines to connect to network.

#include //handles sending and receiving of UDP packages Follow below tutorial to prepare your Arduino IDE to work with the ESP32, if you haven’t already. Upload the following code to your ESP32 and view the result on the screen. The servers which receive time from stratum0 are called as “stratum1” and servers which receive time from stratum1 are called “stratum2” and so on. Each level in the hierarchy is known as a stratum. Save my name, email, and website in this browser for the next time I comment. If your country observes. The connection of ESP8266 takes some time to get connected to NodeMCU so we have to wait till it gets connected.

Since we are using SPI protocol to interface OLED with NodeMCU therefore we will import “SPI.h” library. ESP32 Pinout Reference: Which GPIO pins should you use?   display.println("WELCOME TO"); #include . Then client separates the date and time details which can be further used in applications according to requirement. Open Arduino IDE and Goto Examples > NTPClient > Advanced.   { Our OLED size is 128x64 so we are setting screen width and height as 128 and 64 respectively. String arr_days[]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};

#define SCREEN_WIDTH 128 // OLED display width, in pixels

NTPClient by Fabrice Weinberg, powerful and easy to use; EasyNTPClient from Harsha Alva, an ultra simplified library that only offers 3 methods.

Few years back, ESP8266 took the embedded IoT world by storm. The basic working principle is as follows: Enough of the theory, Let’s Go Practical! The example code you have does the easy part, hours minutes and seconds, by taking the remainder after dividing seconds by days.

W2RG. It only pays attention to the remainder, because despite what the date is, the hours minutes and seconds are consistently offset from midnight. It’s a standard Internet Protocol (IP) for synchronizing the computer clocks to some reference over a network.The protocol can be used to synchronize all networked devices to Coordinated Universal Time (UTC).NTP sets the clocks of computers to UTC, any local time zone offset or day light saving time offset is applied by the client. The code given in this sketch displays the time from NTP server on the serial monitor.

    display.print(":"); void setup(){

    display.print(ss);     display.println(" AM");    The only difference between this code and the previous code is that with the strftime we separate the amount of hour, minute and AM / PM from timeinfo and save them in a string and then display them in clock format on the display. 0. For example, imagine a relay that has to be activated at a certain time or a data logger that has to store values at precise intervals. getFormattedDate() is used get date in “yyyy-mm-dd” format from NTP server.   display.clearDisplay(); const char *password = "circuitdigest101"; WiFiUDP ntpUDP; There are many libraries available for NTP Client. Your email address will not be published. ); This protocol can be used to synchronize many networks to Coordinated Universal Time (UTC) within few milliseconds.   int ss = timeClient.getSeconds(); After uploading the sketch, press the EN button on your ESP32, and you should get the date and time every second as shown below. OPA Based Alice Microphones: a Cardioid and a Figure 8.

getLocalTime() function is used to transmit a request packet to a NTP server and parse the received time stamp packet into to a readable format.

Update() function is used to receive the date and time whenever we request to NTP servers. If you are not familiar with ESP32 boards and how to add and program them with the Arduino IDE, see “Getting Started with the ESP32 on Arduino IDE“. NTP client is initialized using  begin() function to set date and time from NTP servers. Top model has reference clocks known as “stratum0” like atomic clocks, radio waves, GPS, GSM which receives time from the satellite.

NTP stands for Network Time Protocol and it is a networking protocol for clock synchronization between computer systems.

// You can specify the time server pool and the offset (in seconds, can be Next, we set up a few constants like SSID, WiFi password, UTC Offset & Daylight offset that you are already aware of. The solution here is to use Network Time Protocol (NTP). So here in this project, we are getting time from NTP server using ESP8266 NodeMCU and showing it on OLED display.

To get date and time from NTP using Nodemcu module or ESP12-based modules, you must first install the NTP library by searching Library Management. This is how the OLED Internet time Clock will look finally: #include

What is a NTP : An NTP stands for Network Time Protocol.

For that we’ll be using the NTP Client library forked by Taranais.   int index_date = date_time.indexOf("T"); In this tutorial I have installed NTPClient library by Taranais because it is easy to use and have functions to get date and time from NTP servers.

  display.setTextColor(BLUE); Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS); const char *ssid     = "CircuitLoop";    In this manner clients can synchronize to servers regardless of location and time zone differences.

  display.println("  DIGEST"); Please copy the following code & put your network credentials in your code then You need to set offsettime for me it is 19800 Because my timezone is utc+5:30 so UTC +5:30=5.5*60*60=19800UTC+1=1*60*60=3600CALCULATE your timezone and edit it and then upload the code.#include "NTPClient.h"#include "ESP8266WiFi.h"#include "WiFiUdp.h"const char *ssid = "***********";const char *password = "***********";const long utcOffsetInSeconds = 19800;char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};// Define NTP Client to get timeWiFiUDP ntpUDP;NTPClient timeClient(ntpUDP, "", utcOffsetInSeconds);void setup(){ Serial.begin(115200); WiFi.begin(ssid, password); while ( WiFi.status() != WL_CONNECTED ) { delay ( 500 ); Serial.print ( "."

To install the NTP library, first download the library using above link and then install it using Arduino IDE. But these chips are not perfectly accurate so, you need to do manual adjustments over and over again to keep them synchronized. Every once in a while you’ll come across an idea where keeping time a prime concern. Getting time is especially useful in data logging to timestamp your readings. To get the SystemClockRate value, you can use the following command and convert it from seconds to clock ticks by using the formula of seconds × 1,000 × 10,000: W32tm /query /status /verbose ClockRate: 0.0156000s SystemClockRate is the rate of the clock on the system. In response to this request the NTP server sends a time stamp packet.


Apart from Windows time service (, you can also use any one of the time servers, maintained by the NIST, to get the accurate time and date. You need to adjust the UTC offset for your timezone in milliseconds. For example, the UTC coefficient for the United States is calculated as follows: Our server for receiving NTP is the server.

This 7-pin OLED display communicates with ESP8266 module using SPI protocol, below are the circuit diagram and connections table to connect OLED SPI pins with NodeMCU to display Internet time. On the other hand, using the internet to fetch the time from NTP servers is better solution for getting time as it is more accurate and can provide the time of any geographical area in the world. The client device such as ESP32 connects to the server using the User Datagram Protocol (UDP) on port 123.   String date = date_time.substring(0, index_date); NTP automatically selects the best of several available time sources to synchronize which makes it fault-tolerant able protocol. An NTP stands for Network Time Protocol.

Refer the, Change the Daylight offset in milliseconds.

  display.setCursor(0, 2); NTP uses a hierarchical architecture.

A client can then parse out current date & time values. In other words, it is used to synchronize computer clock times in a network.   display.display(); I have (partially) completed a weather station that sends data over my home LAN by connecting to the wifi access point.

A client then transmits a request packet to a NTP server.