Prvni ulozeni z chegewara githubu

libraries/ESP32/examples/Time/SimpleTime/SimpleTime.ino

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+#include <WiFi.h>
+#include "time.h"
+#include "sntp.h"
+
+const char* ssid       = "YOUR_SSID";
+const char* password   = "YOUR_PASS";
+
+const char* ntpServer1 = "pool.ntp.org";
+const char* ntpServer2 = "time.nist.gov";
+const long  gmtOffset_sec = 3600;
+const int   daylightOffset_sec = 3600;
+
+const char* time_zone = "CET-1CEST,M3.5.0,M10.5.0/3";  // TimeZone rule for Europe/Rome including daylight adjustment rules (optional)
+
+void printLocalTime()
+{
+  struct tm timeinfo;
+  if(!getLocalTime(&timeinfo)){
+    Serial.println("No time available (yet)");
+    return;
+  }
+  Serial.println(&timeinfo, "%A, %B %d %Y %H:%M:%S");
+}
+
+// Callback function (get's called when time adjusts via NTP)
+void timeavailable(struct timeval *t)
+{
+  Serial.println("Got time adjustment from NTP!");
+  printLocalTime();
+}
+
+void setup()
+{
+  Serial.begin(115200);
+
+  // set notification call-back function
+  sntp_set_time_sync_notification_cb( timeavailable );
+
+  /**
+   * NTP server address could be aquired via DHCP,
+   *
+   * NOTE: This call should be made BEFORE esp32 aquires IP address via DHCP,
+   * otherwise SNTP option 42 would be rejected by default.
+   * NOTE: configTime() function call if made AFTER DHCP-client run
+   * will OVERRIDE aquired NTP server address
+   */
+  sntp_servermode_dhcp(1);    // (optional)
+
+  /**
+   * This will set configured ntp servers and constant TimeZone/daylightOffset
+   * should be OK if your time zone does not need to adjust daylightOffset twice a year,
+   * in such a case time adjustment won't be handled automagicaly.
+   */
+  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer1, ntpServer2);
+
+  /**
+   * A more convenient approach to handle TimeZones with daylightOffset 
+   * would be to specify a environmnet variable with TimeZone definition including daylight adjustmnet rules.
+   * A list of rules for your zone could be obtained from https://github.com/esp8266/Arduino/blob/master/cores/esp8266/TZ.h
+   */
+  //configTzTime(time_zone, ntpServer1, ntpServer2);
+
+  //connect to WiFi
+  Serial.printf("Connecting to %s ", ssid);
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED) {
+      delay(500);
+      Serial.print(".");
+  }
+  Serial.println(" CONNECTED");
+
+}
+
+void loop()
+{
+  delay(5000);
+  printLocalTime();     // it will take some time to sync time :)
+}