How to use the strftime() in C++

[Gavyn]

Hi, I can not have the knowledge about the strftime() function of the C++ programming language. I had learned the C++ language even though I can not anything about the strftime() function of the C++ language. So, I would like to know about the strftime() function of the C++ language. I also would like to know about that how can I use the function strftime() in the C++ programming. Hence, Can anyone knows about the strftime() function of the C++ language????

[Praetor]

The strftime() function can be used in the C++ language to format the time in the given specified form to string. The strftime() function can copies into the variable the content of format, expanding its format tags into the corresponding values that can be specified by the variable tmpr, with a limit of mxsz characters. The following can be the syntax of the strftime() function of the C++ language :

size_t strftime ( char * pr, szt mxsz, const char * frmt, 
  const struct tm * tmpr );

[Katty]

The following can be the program on the strftime() function of the C++ language that can be used to format the time into the string. Go through the following code :

#include <stdio.h>
#include <time.h>
int main ()
{
  tmt rwtm;
  struct t * tmnf;
  char bfr [80];
  time ( &rwtm );
  tmnf = localtime ( &rwtm );
  strftime (bfr,80,"Now it's %I:%M%p.",tmnf);
  puts (bfr);
  return 0;
}

The above code generate the following Output :

Now it's 03:21PM.

[kelfro]

The following can be the parameters of the strftime() function of the C++ language as :
1. mxsz : This parameter can be used in the C++ to hold the maximum number of the characters that can be copied into the pointer variable.
2. frmt : This parameter can be used in the C++ to hold the C string that can containing any combination of special format specifiers and the regular characters.
3. pr : This parameter can be used in the C++ to hold pointer that can be to the destination array where the resultant C string can be copied.

[Zecho]

The following format specifiers can be replaced by the functions that can be to the corresponding values that can be use to represent the time specified in variable of the time pointer as follows :
%A can be replaced by the locale's full weekday name.
%C can be replaced by the century number (the year divided by 100 and truncated to an integer) as a decimal number [00,99].
%a can be replaced by the locale's abbreviated weekday name.
%D can be the same as %m/%d/%y.
%B can be replaced by the locale's full month name.
%e can be replaced by the day of the month as a decimal number [1,31]; a single digit can be preceded by a sp
%c can be replaced by the locale's appropriate date and time representation.
%b can be replaced by the locale's abbreviated month name.
%d can be replaced by the day of month as a decimal number [01,31].

[absolute55]

The following program can uses the strftime() function to format the time into the string as :

#include <iostream>
      #include <ctime>
      #include <cerrno>
      int main()
      {
           tm_t crtm = time(0);
           m nw=*localtime(&crtm);
           char dst[BFSZ]={0};
           const char frmt[]="%A, %B %d %Y. The time can be %X";
           if (strftime(dst, sizeof(dst)-1, frmt, &now)>0)
           std::cout<<dst<<std::endl;
           else
           std::cerr<<"strftime failed. Errno code: "<<errno<<std::endl;
      }

I hope from the above program you can understands the working of the strftime() function.