How to get system time in c++?

c Methods to obtain system time: 1. Use system functions, and the system time can be modified; 2. Get system time, the code is [time_t now_time=time(NULL)]; 3. Use windows API, accurate to the millisecond level.

c Method to obtain system time:

1. Use system functions and modify the system Time

#include <stdlib.h>
 
using namespace std;
 
void main()
{
   system("time");
}

Note: The information obtained is hours: minutes: seconds Information

2. Get the system time (second level), It can be converted into year, month, day, week, hour, minute and second

#include<iostream>  
#include<time.h>  
using namespace std;  
  
void main()  
{  
 
//获取系统时间  
time_t now_time=time(NULL);  
//获取本地时间  
tm*  t_tm = localtime(&now_time);  
//转换为年月日星期时分秒结果，如图：  
printf("local time is    : %s\n", asctime(t_tm));  
//将时间转换为秒  
time_t mk_time = mktime(t_tm);  
  
//也可以自己定义一个时间  
//定义截止时间  
struct tm deadline_tm;  
deadline_tm.tm_sec=0;//[0~59]  
deadline_tm.tm_min=10;//[0~59]  
deadline_tm.tm_hour=13;//[0~23]  
deadline_tm.tm_isdst=0;//default  
deadline_tm.tm_mday=31;//[1~31]  
deadline_tm.tm_mon=2;//[0~11]  
}

3. Use windows API, accurate to millisecond level

#include <windows.h>
#include <stdio.h> 
using namespace std;
 
void main()
{
       SYSTEMTIME sys; 
       GetLocalTime( &sys ); 
       printf( "%4d/%02d/%02d %02d:%02d:%02d.%03d 星期%1d\n",sys.wYear,sys.wMonth,sys.wDay,sys.wHour,sys.wMinute, sys.wSecond,sys.wMilliseconds,sys.wDayOfWeek);

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