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libraries/NTP/examples/ESP32_OLED_NTP/ESP32_OLED_NTP.ino

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+// example ESP32 board with oled, use oled lib https://github.com/squix78/esp8266-oled-ssd1306
+
+#include <Arduino.h>
+#include "WiFi.h"
+#include <WiFiUdp.h>
+#include "SSD1306.h"
+#include "NTP.h"
+
+char ssid[] = "yourSSID";
+char password[] = "yourPASSWORD";
+
+SSD1306 display(0x3c, 5, 4);
+WiFiUDP wifiUdp;
+NTP ntp(wifiUdp);
+
+void display_text(String text){
+  display.clear();
+  display.setColor(WHITE);
+  display.setTextAlignment(TEXT_ALIGN_CENTER);
+  display.drawString(64, 15, text);
+  display.display();
+  }
+
+void setup() {
+  Serial.begin(9600);
+  display.init();
+  WiFi.begin(ssid, password);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    display_text("Connecting ...");
+    delay (500);
+    }
+  display.clear();
+  display_text("Connected");
+  delay (500);
+  ntp.ruleDST("CEST", Last, Sun, Mar, 2, 120); // last sunday in march 2:00, timetone +120min (+1 GMT + 1h summertime offset)
+  ntp.ruleSTD("CET", Last, Sun, Oct, 3, 60); // last sunday in october 3:00, timezone +60min (+1 GMT)
+  // ntp.isDST(false);
+  // ntp.timeZone(1);
+  // ntp.offset(0, 0, 0, 0);
+  ntp.begin();
+  display_text("start NTP");
+  delay (500);
+  }
+
+void loop() {
+  ntp.update();
+  display.clear();
+  display.fillRect(1, 0, 126 * ntp.seconds() / 59, 2);
+  display.setTextAlignment(TEXT_ALIGN_CENTER);
+  display.drawString(64, 5, ntp.formattedTime("%d. %B %Y"));
+  display.drawString(64, 15, ntp.formattedTime("%A %T"));
+  display.drawString(64, 25, ntp.ruleDST());
+  display.drawString(64, 35, ntp.ruleSTD());
+  display.drawString(64, 45, ntp.tzName());
+  display.display();
+  delay(500);
+  }

libraries/NTP/examples/WIFI_NTP/WIFI_NTP.ino

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+// example for WIFI based boards like ESP8266, ESP32, Nano RP2040 Connect, WiFi 101 shield or MKR1000
+
+#include "Arduino.h"
+// change next line to use with another board/shield
+//#include <ESP8266WiFi.h>
+//#include <WiFi.h> // for WiFi shield or ESP32
+//#include <WiFi101.h> // for WiFi 101 shield or MKR1000
+#include <WiFiNINA.h> // for e.g. Nano RP2040 Connect
+//#include "WiFiUdp.h" // not needed for WiFiNINA
+#include "NTP.h"
+
+char ssid[]     = "yourSSID";
+char password[] = "yourPASSWORD";
+
+WiFiUDP wifiUdp;
+NTP ntp(wifiUdp);
+
+void setup() {
+  Serial.begin(9600);
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED) {
+    Serial.println("Connecting ...");
+    delay(500);
+    }
+  Serial.println("Connected");  
+  ntp.ruleDST("CEST", Last, Sun, Mar, 2, 120); // last sunday in march 2:00, timetone +120min (+1 GMT + 1h summertime offset)
+  ntp.ruleSTD("CET", Last, Sun, Oct, 3, 60); // last sunday in october 3:00, timezone +60min (+1 GMT)
+  ntp.begin();
+  Serial.println("start NTP");
+  }
+
+void loop() {
+  ntp.update();
+  Serial.println(ntp.formattedTime("%d. %B %Y")); // dd. Mmm yyyy
+  Serial.println(ntp.formattedTime("%A %T")); // Www hh:mm:ss
+  delay(1000);
+  }