Does NTPClient updates the ESP32 board date and time? - esp32

Question

I need to update my current ESP32 date and time in order to correctly report sensor events to server. I need a non blocking implementation....
So far I've used the NTPClient library as follows:
File Ntp.h
class Ntp
{
private:
bool ntpRunning = false;
public:
void setup();
void loop();
void print();
String getDateTime();
};
File Ntp.cpp
#include <NTPClient.h>
#include <Arduino.h>
#include <WiFi.h> // for WiFi shield
#include <WiFiUdp.h>
#include <Logger.h>
#include "Ntp.h"
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)
// additionally you can specify the update interval (in milliseconds).
// NTPClient timeClient(ntpUDP, "europe.pool.ntp.org", 3600, 60000);
NTPClient timeClient(ntpUDP);
String Ntp::getDateTime()
{
struct timeval tv;
time_t nowtime;
struct tm *nowtm;
char tmbuf[64];
char buf[64];
gettimeofday(&tv, NULL);
nowtime = tv.tv_sec;
nowtm = localtime(&nowtime);
strftime(tmbuf, sizeof tmbuf, "%Y-%m-%d %H:%M:%S", nowtm);
snprintf(buf, sizeof buf, "%s.%06ld", tmbuf, tv.tv_usec);
return (String) buf;
}
void Ntp::print()
{
Serial.print(getDateTime());
Serial.print(" - ");
Serial.println(message);
}
void Ntp::setup()
{
// empty
}
void Ntp::loop()
{
if (!this->ntpRunning && WiFi.status() == WL_CONNECTED)
{
timeClient.begin();
this->ntpRunning = true;
this->print("NTP begin...");
}
if (timeClient.update())
{
this->print("NTP update");
this->print(timeClient.getFormattedTime());
this->print("This is the new date and time")
}
}
My output:
1970-01-01 00:00:14.857479 - NTP begin
1970-01-01 00:00:15.161455 - NTP update
1970-01-01 00:00:15.168832 - 21:59:29
1970-01-01 00:00:15.169365 - This is the new date and time
So, getFormattedDateTime() show current date and time, but it's value is not being set on the device - as can be seen in the log date/time trailler.
I can't find on NtpClient's github page any documentation describing how it works internally, so...
Does ntpClient.update() set's the board clock? If yes, what am I missing on my code?
If not, how can I accomplish this - read NTP server and update the device clock?