You get the current time and date with functions declared in <time.h>.
In particular, you can get the current calendar time with (surprise!)
the function time(), which returns a variable of type time_t.  If all
you want is a string representing the current time and date, you can use
ctime() with the value from time() which returns a pointer to a string.

Here is an example:

#include <stdio.h>
#include <time.h>
int main(void)
{
     time_t t;
     struct tm tstruct;
     t = time(0);
     tstruct = *localtime(&t);
     printf("The time from ctime   is %s", ctime(&t));
     printf("The time from asctime is %s", asctime(&tstruct));
     tstruct.tm_min += 6;
     t = mktime(&tstruct);
     printf("In 6 minutes,\n");
     printf("The time from ctime   will be %s", ctime(&t));
     printf("The time from asctime will be %s", asctime(&tstruct));
     return 0;