date function

[rtnMichael]

Hi,
I want to create a file with just the date in it. I know I can call date(), but how do I do it to print to a file?

Thanks
M

 

[Laopang]

use snprintf,copy your data into a buffer,and write it into a file,it is so easy like:

snprintf(buf, 32, "%d\n", (int) getpid());
write(fd, buf, strlen(buf));

 

[keenanbr]

#include <stdio.h>
#include <sys/types.h>
#include <time.h.

main(int argc, char **argv)
{
FILE *fp;
time_t the_time;
struct tm *loc_time;

the_time = time(0L);
lc_time = gmtime(&the_time);

fp = fopen(&quot;test.txt&quot;, &quot;w&quot;
fprintf(fp, &quot;%02d-%02d-%02d&quot;, lc_time->tm_mday, lc_time->tm_mon+1, lc_time->tm_year % 100);
fclose(fp);
}

 

[rtnMichael]

both ways worked, thanks for the help

M

 

[rtnMichael]

ok, now I have a new one for you....what if I wanted to get the date and name the file with the real time current date?

 

[quagsire]

...
char fileName[15];
sprintf(fileName,&quot;%04d%02d%02d&quot;, loc_time.tm_year, loc_time.tm_mon, loc_time.tm_mday);
fp = fopen(fileName, &quot;w&quot;
...

Ex. the file will be named &quot;20020807&quot;.

 

[Laopang]

Use ctime() to get the current date if your application runs on Linux or Unix.See the reference.