Hi getting system time in C++

Hi all,

How do i get the system time in C++?


thnks!

Code:

---

# define TIME_SIZE 40

  const struct tm *tm;
  size_t len;
  time_t now;
  char *s;

  now = time ( NULL );
  tm = localtime ( &now );

  s = new char[TIME_SIZE];

  len = strftime ( s, TIME_SIZE, "%d %B %Y %I:%M:%S %p", tm );

---

You can make use of strftime.

Code:

---

#include <iostream>
#include <ctime>
#include <cerrno>
 
int main()
{
    //Find the current time
    time_t curtime = time(0);
     
      //convert it to tm
      tm now=*localtime(&curtime);
   
    //BUFSIZ is standard macro that expands to a integer constant expression
    //that is greater then or equal to 256. It is the size of the stream buffer
    //used by setbuf()
    char dest[BUFSIZ]={0};
   
    //Format string determines the conversion specification's behaviour
    const char format[]="%A, %B %d %Y. The time is %X";
   
    //strftime - converts date and time to a string
    if (strftime(dest, sizeof(dest)-1, format, &now)>0)
      std::cout<<dest<<std::endl;
    else
      std::cerr<<"strftime failed. Errno code: "<<errno<<std::endl;
}

---

You can make use of _strtime but it's non-portable and may not work on every system.

Code:

---

#include <iostream>
#include <ctime>
 
int main ()
{
  char time [10];
  _strtime(time);
  std::cout<<"Current Time:"<<time;
  return 0;
}

---

On windows Using Win32 API we can make it very simple.

Code:

---

#include<iostream>
#include<windows.h>

int main(){
        SYSTEMTIME st;
        GetLocalTime(&st);
        std::cout<<st.wHour<<":"<<st.wMinute<<":"<< st.wSecond;
        return 0;
}

---

You can find details for all other related functions here

You can use GetSystemTime. Here is the list of all Windows time functions.