NTPClient

Connect to a NTP server, here is how:

#include <NTPClient.h>
// change next line to use with another board/shield
#include <ESP8266WiFi.h>
//#include <WiFi.h> // for WiFi shield
//#include <WiFi101.h> // for WiFi 101 shield or MKR1000
#include <WiFiUdp.h>

const char *ssid     = "<SSID>";
const char *password = "<PASSWORD>";

WiFiUDP ntpUDP;

// By default 'pool.ntp.org' is used with 60 seconds update interval and
// no offset
NTPClient timeClient(ntpUDP);

// You can specify the time server pool and the offset, (in seconds)
// additionaly you can specify the update interval (in milliseconds).
// NTPClient timeClient(ntpUDP, "europe.pool.ntp.org", 3600, 60000);

void setup(){
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  while ( WiFi.status() != WL_CONNECTED ) {
    delay ( 500 );
    Serial.print ( "." );
  }

  timeClient.begin();
}

void loop() {
  timeClient.update();

  Serial.println(timeClient.getFormattedTime());

  delay(1000);
}

Function documentation

Constructor: NTPClient(UDP& udp, const char* poolServerName, long timeOffset, unsigned long updateInterval)

• udp : WiFiUDP object.
• poolSeverName (optional): NTP Server Name. Use the nearest server to your loaction. The server list can be found here. The default is pool.ntp.org (global).
• timeOffset (optional): Time offset with GMT for your location in seconds. The deafut is 0.
• updateInterval (optional): Refresh Interval im milliseconds. Default is 60000 millisecond or 1 minute.

getEpochTime()

Returns the unix epoch, which are the seconds elapsed since 00:00:00 UTC on 1 January 1970 (leap seconds are ignored, every day is treated as having 86400 seconds). Attention: If you have set a time offset this time offset will be added to your epoch timestamp.

getFormattedTime()

Returns the formatted current time string in hh:mm:ss format.

getHours()

Returns the current "hour" in 24 hour format (0-23).

getMinutes()

Returns the current "minute" integer.

getSeconds()

Returns the current "second" integer.