程序代码：

#include <stdio.h>
#include <time.h>
int main()
{
    char filename[] = "c:\\test.txt";
    FILE* fp;
    time_t rawtime;
    struct tm * timeinfo;
    time ( &rawtime );
    timeinfo = localtime ( &rawtime );
    if((fp = fopen(filename,"a+")) == NULL)
    {
        return 0;
    }
    else
    {
        fputs(asctime (timeinfo),fp);
    }
    fclose(fp);
    return 0;
}