Adding Date in a file - C

I'm coding a net开发者_JAVA技巧work game in C. I 've written scores in a file. I also wanted to add the date of the day. Here is the file's structure : Date Name Score and the code :

ScoreFile = fopen("scores.txt", "a");
fprintf(ScoreFile, "%s %d\n", Name, Score);

I've tried system("date") but it's printed on stdout. I think that I can't add the Date with fprintf.

Do you know a solution that permits to add Date in a file ? (maybe something from time.h ?)

thanks a lot !!

Consider using strftime to convert the time structure to string.

Example (from link above):

#include <time.h>
// ...

char s[30];
size_t i;
struct tm tim;
time_t now;
now = time(NULL);
tim = *(localtime(&now));
i = strftime(s,30,"%b %d, %Y; %H:%M:%S\n",&tim);

puts Jul 9, 2011; 17:55:55\n in s

Something like this should work

time_t now;
time(&now);

printf("... %s\n", ctime(&now));

If you need to specify your own format, look into strftime. If you later need to read it back and parse it, you might be better off writing the number of seconds since epoch (the time_t, perhaps in ASCII?).

The simplest would be to:

time_t now = time(NULL);
fprintf(ScoreFile, "[%s] %s %d\n", ctime(&now), Name, Score);

Have a look at strptime, strftime and mktime from time.h.

To parse:

struct tm timeStruct = {0,0,0,0,0,0,0,0,0};
char *timeBuf = "03061983";
char *p = strptime(timeBuf, "%d%b%y", &timeStruct);

if (p != NULL)
{
    // manipulate timeStruct.
    // use mktime to get the time_t value
}

To write:

  time_t t;
  struct tm * timeStruct;
  char timeBuf[6];

  time(&t);
  timeStruct = localtime(&t);

  strftime (timeBuf, 6, "%d%b%y", timeStruct)

Regards,
Yusuf