#include <WiFi.h>
#include <HTTPClient.h>
#include <time.h>

const char* ssid = "esp32";
const char* password = "guanzhuyixia!";
const char* ntpServer = "pool.ntp.org";
const long utcOffsetInSeconds = 28800; // Beijing: UTC +8  -- 获取东八区时间(默认以英国格林威治天文台所在地的本初子午线为基准线的)

void setup() {
  Serial.begin(115200);
  while (!Serial);
  //连接wifi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
  //获取时间
  configTime(utcOffsetInSeconds, 0, ntpServer);
  while (!time(nullptr)) {
    delay(1000);
    Serial.println("Waiting for time sync...");
  }
  Serial.println("Time synced successfully");
}

void loop() {
  time_t now = time(nullptr);
  Serial.print("Current time is: ");
  Serial.println(ctime(&now));  //打印时间
  // Convert current time to Unix timestamp
  long unixTimestamp = static_cast<long>(now);  //获取unix时间戳 
  Serial.print("Unix timestamp is: ");
  Serial.println(unixTimestamp);
  delay(1000);
}
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原文链接：https://blog.csdn.net/hongyun1221/article/details/130013819