NTPClientIsSet
/*F********************************************************************
*
**********************************************************************/
#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>

//************************* DEFINES ************************************

//************************* PROTOTYPES ************************************

//************************* VARIABLES ************************************
const char *ssid     = "";
const char *password = "";
WiFiUDP ntpUDP;
// initialized to a time offset of 10 hours
NTPClient timeClient(ntpUDP,"pool.ntp.org", 36000, 60000);
//                           HH:MM:SS
// timeClient initializes to 10:00:00 if it does not receive an NTP packet
// before the 100ms timeout.
// without isTimeSet() the LED would be switched on, although the time
// was not yet set correctly.
// blue LED on ESP-12F
const int led = 2;
const int hour = 10;
const int minute = 0;

/*F********************************************************************
*
**********************************************************************/
void 
setup()
{
    Serial.begin( BAUD );
    pinMode( led, OUTPUT );
    // led is off when pin is high
    digitalWrite( led, 1);
    WiFi.begin( ssid, password );
    while( WiFi.status() != WL_CONNECTED) 
    {
        delay( 500 );
        Serial.print (".");
    }
    timeClient.begin();
}
/*F********************************************************************
*
**********************************************************************/
void 
loop() 
{
    timeClient.update();
    Serial.println( timeClient.getFormattedTime() );
    if( timeClient.isTimeSet() ) 
    {
        if( (hour == timeClient.getHours()) 
            && (minute == timeClient.getMinutes()) ) 
            digitalWrite( led, 0);
    }
    delay( 1000 );
}