struct test
{
     date_time[100];
     date[100];
     time[100];
}test;

int get_time()
{
    printf("\nget_time\n");
    time_t timep;
    struct tm* p;
    time( &timep );
    p = gmtime( &timep );
    sprintf(test.date_time, "%04d%02d%02d%02d%02d%02d", (1900 + p->tm_year),
            (1 + p->tm_mon), (p->tm_mday), p->tm_hour, p->tm_min, p->tm_sec );
    memcpy(test.date, test.date_time, 8);
    memcpy(test.time, test.date_time + 8, 6);
    printf("test.date_time: %s\n", test.date_time);
    return 0;
}
// 返回当前日期+1的字符串表示
// 比如当前日期是20110531 返回20110601
int date_add1()
{
}

// 返回当前日期-1的字符串表示
// 比如当前日期是20110501 返回20110430
int date_sub1()
{
}

int date_add(int n, char *date_time)
{
    char tmp[10] = {0};
    int month_all[13];
    int i;
    int year, month, day;
    // 闰年
    int month_r[13] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    // 平年
    int month_p[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

    if (strlen(date_time) != 8)
        return -1;
    memcpy(tmp, date_time, 4);
    year = atoi(tmp);
    memset(tmp, 0x00, sizeof(tmp));
    memcpy(tmp, date_time + 4, 2);
    month = atoi(tmp);
    memset(tmp, 0x00, sizeof(tmp));
    memcpy(tmp, date_time + 6, 2);
    day = atoi(tmp);
    printf("year: %d month: %d day: %d\n", year, month, day);
    if (((year % 4) == 0 && (year % 100) != 0) || (year % 400) == 0) // 闰年
    {
        printf("闰年!\n");
        for (i = 0; i < 13; i++)
            month_all[i] = month_r[i];
    }
    else //平年
    {
        for (i = 0; i < 13; i++)
            month_all[i] = month_p[i];
    }
    day += n;
    while (day > month_all[month])
    {
        day -= month_all[month];
        month++;
        while (month > 12)
        {
            month -= 12;
            year++;
            if (((year % 4) == 0 && (year % 100) != 0) || (year % 400) == 0) // 闰年
            {
                printf("闰年!\n");
                for (i = 0; i < 13; i++)
                    month_all[i] = month_r[i];
            }
            else //平年
            {
                for (i = 0; i < 13; i++)
                    month_all[i] = month_p[i];
            }
        }
    }
    memset(date_time, 0x00, strlen(date_time));
    sprintf(date_time, "%04d%02d%02d", year, month, day);
    return 0;
}

int date_sub(int n, char *date_time)
{
    char tmp[10] = {0};
    int month_all[13];
    int i;
    int year, month, day;
    // 闰年
    int month_r[13] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    // 平年
    int month_p[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

    if (strlen(date_time) != 8)
        return -1;
    memcpy(tmp, date_time, 4);
    year = atoi(tmp);
    memset(tmp, 0x00, sizeof(tmp));
    memcpy(tmp, date_time + 4, 2);
    month = atoi(tmp);
    memset(tmp, 0x00, sizeof(tmp));
    memcpy(tmp, date_time + 6, 2);
    day = atoi(tmp);
    printf("year: %d month: %d day: %d\n", year, month, day);
    if (((year % 4) == 0 && (year % 100) != 0) || (year % 400) == 0) // 闰年
    {
        printf("闰年!\n");
        for (i = 0; i < 13; i++)
            month_all[i] = month_r[i];
    }
    else //平年
    {
        for (i = 0; i < 13; i++)
            month_all[i] = month_p[i];
    }
    day -= n;
    while (day <= 0)
    {
        month--;
        while (month <= 0)
        {
            month = 12 + month;
            year--;
            if (((year % 4) == 0 && (year % 100) != 0) || (year % 400) == 0) // 闰年
            {
                printf("闰年!\n");
                for (i = 0; i < 13; i++)
                    month_all[i] = month_r[i];
            }
            else //平年
            {
                for (i = 0; i < 13; i++)
                    month_all[i] = month_p[i];
            }
        }
        day = day + month_all[month];
    }
    memset(date_time, 0x00, strlen(date_time));
    sprintf(date_time, "%04d%02d%02d", year, month, day);
    return 0;
}
写了2个增加n天的函数，不知道对不对啊

[ 本帖最后由 widon1104 于 2011-5-9 14:02 编辑 ]