how to display datetime using C Programming - c

Question

I have to display date and time separately using gettime() and getdate() in C programming language. The code I have written only displays date and time on same line. I want this code to be done using only core C not in a windows format.The editor I am using is Visual Studio 2008
Below I have post my code which only shows date time on a single line.
#include "stdafx.h"
#include <conio.h>
#include <stdio.h>
#include <time.h>
char *gettime();
int_main(int argc,_TCHAR* argv[])
{
printf("The time is %s\n",gettime());
getch();
return 0;
}
char *gettime()
{
time_t t;
tm b;
time(&t);
return ctime(&t);
}

Answer 1

You can use localtime/gmtime
struct tm * timeinfo;
timeinfo = localtime (&t);
And work with tm structure components as you need, also you can use strfrtime format function if you need only print date and time.

Answer 2

Main function is the same for all the different ways:
#include <stdio.h>
#include <time.h>
#include <string.h>
char * gettime();
char * getdate();
int main()
{
printf("The time is %s\n", gettime());
printf("The date is %s\n", getdate());
return 0;
}
One way you could do it is with manipulating the strings coming back from ctime() function. We know they are built in a similar way, the 1st 12 chars are week-day, month, month-day, then comes 8 chars of time, then finally the year. You could create functions like this:
char * gettime()
{
time_t t;
//use static so not to save the var in stack, but in the data/bss segment
//you can also make it a global scope, use dynamic memory allocation, or
//use other methods as to prevent it from being erased when the function returns.
static char * time_str;
time(&t);
time_str = ctime(&t) + 11;
time_str[9] = 0; //null-terminator, eol
return time_str;
}
char * getdate()
{
time_t t;
static char * date_str;
static char * year;
time(&t);
date_str = ctime(&t) + 4;
date_str[6] = 0;
year = date_str + 15;
year[5] = 0;
strcat(date_str, year);
return date_str;
}
The second way to do this is using localtime() function to create a tm-struct, and then extract what you need from it.
char * gettime()
{
time_t t;
struct tm *info;
static char time_str[10];
time(&t);
info = localtime(&t);
sprintf(time_str,"%d:%d:%d",(*info).tm_hour, (*info).tm_min, (*info).tm_sec);
return time_str;
}
char * getdate()
{
time_t t;
struct tm *info;
static char date_str[12];
time(&t);
info = localtime(&t);
sprintf(date_str,"%d/%d/%d",(*info).tm_mday, (*info).tm_mon+1, (*info).tm_year+1900);
return date_str;
}
You can make it a bit more clean using the strftime() function:
char * gettime()
{
time_t t;
struct tm *info;
static char time_str[10];
time(&t);
info = localtime(&t);
strftime(time_str, 10, "%S:%M:%H",info);
return time_str;
}
char * getdate()
{
time_t t;
struct tm *info;
static char date_str[12];
time(&t);
info = localtime(&t);
strftime(date_str, 12, "%d:%m:%Y",info);
return date_str;
}