将日期和时间作为 struct tm型的值直接向二进制文件进行读写

#include <stdio.h>

#include <time.h>

char data_file[]="D:\%\datetime.dat";

void get_data(void)

{

    FILE *fp;

    time_t t;

    if((fp = fopen(data_file,"r")) == NULL)

        printf("本程序第一次运行!
");

    else {

        fread(&t,sizeof(time_t),1,fp);

        struct tm *local;

        time(&t);

        local = localtime(&t);

        printf("%d %d %d %d %d %d 
",local->tm_year,local->tm_mon,

               local->tm_mday,local->tm_hour,local->tm_min,local->tm_sec);

        fclose(fp);

    }

}

void put_data(void)

{

    FILE *fp;

    time_t t;

    if((fp = fopne(data_file)) == NULL)

        printf("a文件打开失败
");

    else {

        fwrite(&t,sizeof(time_t),1,fp);

        fclose(fp);

    }

}

int main(void)

{

    get_data();

    put_data();

    return 0;

}