#include <WiFi.h>
#include <NTPClient.h>
#include <WiFiUdp.h>

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "europe.pool.ntp.org", 8 * 3600,60000);

Serial.print("wifi connected");
WiFi.begin("***", "***"); // ssid , password
while(WiFi.status() != WL_CONNECTED)
{
  Serial.print(".");
  delay(1000);
}
timeClient.begin();

timeClient.update();
String time = timeClient.getFormattedTime();	//Hour:Minu:Sec格式字符串
unsigned long timestamp = timeClient.getEpochTime() - 8*3600;	//UTC时间戳
struct tm *ptm = gmtime((time_t *)&timestamp);
String month,date,week_day,week[7]={"Sun","Mon","Tue","Wed","Thur","Fri","Sat"};
int Hour = timeClient.getHours();
month = String(ptm->tm_mon + 1);  //月
date = (Hour < 8) ? String(ptm->tm_mday + 1) : String(ptm->tm_mday);  //日
week_day = week[timeClient.getDay()]; //星期

#include <WiFi.h>
#include <NTPClient.h>
#include <WiFiUdp.h>

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "europe.pool.ntp.org", 8 * 3600,60000);
const char *ssid = "***";	//WIFI名称
const char *password = "***";	//WIFI密码

void setup() {
  Serial.begin(115200);	//串口输出初始化
  WiFi.begin(ssid, password); // 连接WIFI
  Serial.print("wifi connected");
  while(WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(1000);
  }
  timeClient.begin();
}

void loop() {
  timeClient.update();
  String time = timeClient.getFormattedTime();	//Hour:Minu:Sec格式字符串
  unsigned long timestamp = timeClient.getEpochTime() - 8*3600;	//UTC时间戳
  struct tm *ptm = gmtime((time_t *)&timestamp);
  String month,date,week_day,week[7]={"Sun","Mon","Tue","Wed","Thur","Fri","Sat"};
  int Hour = timeClient.getHours();
  month = String(ptm->tm_mon + 1);  //月
  date = (Hour < 8) ? String(ptm->tm_mday + 1) : String(ptm->tm_mday);  //日
  week_day = week[timeClient.getDay()]; //星期

  Serial.println("time:" + time);
  Serial.println("timestamp:" + String(timestamp));
  Serial.println("month:" + month);
  Serial.println("date:" + date);
  Serial.println("week:" + week_day);
  
  delay(1000);
}

seconds 秒数
callback 回调函数
arg 是回调函数的参数

/*单次执行*/
void once(float seconds, callback_function_t callback);	//xx秒后只执行一次——不带参
void once(float seconds, callback_function_t callback,TArg arg); //xx秒后只执行一次——带参

void once_ms(float seconds, callback_function_t callback) //xx毫秒后只执行一次
void once_ms(float seconds, callback_function_t callback,TArg arg) //xx毫秒后只执行一次

/*周期执行*/
void attach(float seconds, callback_function_t callback); //每隔xx秒周期性执行
void attach(float seconds, callback_function_t callback,TArg arg); //每隔xx秒周期性执行

void attach_ms(float seconds, callback_function_t callback); //每隔xx毫秒周期性执行
void attach_ms(float seconds, callback_function_t callback,TArg arg); //每隔xx毫秒周期性执行

#include <Ticker.h>
#include <NTPClient.h>

/*定义任务对象*/
Ticker ticker1;
Ticker ticker2;

/*需要执行的任务*/
void function1()
{
  Serial.println("function1已调用");
}

void function2()
{
  Serial.println("function2已调用");
}

void setup() {
  Serial.begin(115200);
  
  ticker1.attach(1,function1);	//每1s执行一次function1
  ticker2.attach_ms(200,function2);	//每200ms执行一次function2
}

void loop()  {

}