“yyyymmddhhmiss"、tm、time_t、ASN1_TIME 之间的类型转换

总结一下“yyyymmddhhmiss"、tm、time_t、ASN1_TIME 之间的类型转换：

      

 1、yyyymmddhhmiss到tm再到time_t

       time_t FormatTime2(char * szTime)

1. {  
2.     struct tm tm1;  
3.     time_t time1;  
4.   
5.   
6.     sscanf(szTime, "%4d%2d%2d%2d%2d%2d",      
7.           &tm1.tm_year,   
8.           &tm1.tm_mon,   
9.           &tm1.tm_mday,   
10.           &tm1.tm_hour,   
11.           &tm1.tm_min,  
12.           &tm1.tm_sec);  
13.           
14.     tm1.tm_year -= 1900;  
15.      tm1.tm_mon --;  
16.   
17.   
18.     tm1.tm_isdst=-1;  
19.     
20.     time1 = mktime(&tm1);  
21.     return time1;  
22. }  

 2、time_t到tm再到yyyymmddhhmiss

1. void FormatTime(time_t time1, char *szTime)  
2. {  
3.     struct tm tm1;  
4.   
5.   
6. #ifdef WIN32  
7.     tm1 = *localtime(&time1);  
8. #else  
9.     localtime_r(&time1, &tm1 );  
10. #endif  
11.     sprintf( szTime, "%4.4d%2.2d%2.2d%2.2d%2.2d%2.2d",  
12.            tm1.tm_year+1900, tm1.tm_mon+1, tm1.tm_mday,  
13.              tm1.tm_hour, tm1.tm_min,tm1.tm_sec);  
14. }            

 3、time_t到ASN1_TIME

                ASN1_TIME *ASN1_TIME_set(ASN1_TIME *s, time_t t)

4、ASN1_TIME     到   time_t

                参看链接3

另：以“Sat Sep  8 21:46:40 2001”类型输出

               asctime（struct  tm  *timeinfo）；

自己写的代码（有点乱）：

               #include <stdio.h>

#include <time.h>
#include <stdlib.h>

#include <openssl/pem.h>
#include <openssl/conf.h>
#include <openssl/x509v3.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
time_t FormatTime2(const char * szTime) 
{ 
        struct tm tm1; 
        time_t time1; 
       
        sscanf(szTime, "%4d%2d%2d%2d%2d%2d",
               &tm1.tm_year,  
               &tm1.tm_mon,  
               &tm1.tm_mday,  
               &tm1.tm_hour,  
               &tm1.tm_min, 
               &tm1.tm_sec); 
       
        tm1.tm_year -= 1900; 
        tm1.tm_mon --; 
       
        tm1.tm_isdst=-1; 
        time1 = mktime(&tm1); 
       
        return time1; 
}

int FormatTime(const char * szTime, time_t *b, time_t *a)
{
        struct tm before, after;
        sscanf(szTime, "%4d%2d%2d%4d%2d%2d",
               &before.tm_year,
               &before.tm_mon,
               &before.tm_mday,
               &after.tm_year,
               &after.tm_mon,
               &after.tm_mday);
        before.tm_hour = before.tm_min = before.tm_sec = 0;
        after.tm_hour = after.tm_min = after.tm_sec = 0;
              
        before.tm_year -= 1900;
        before.tm_mon --; 
        before.tm_isdst=-1; 
       
        after.tm_year -= 1900;
        after.tm_mon --;
        after.tm_isdst=-1;
       
        *b = mktime(&before); 
        *a = mktime(&after);
       
        return 0;
}

int main()
{
        time_t rawtime = 1000000000;
        const char tttt[16] = "2014112420151124";
        time_t a, b;
        struct tm * timeinfo;
        //time ( &rawtime ); // 或把你的时间赋给rawtime
        timeinfo = localtime ( &rawtime ); // 转为当地时间，输出 tm  结构
        printf("timeinfo->tm_year : %d \n", (timeinfo->tm_year));
        printf("timeinfo->tm_mon : %d \n", (timeinfo->tm_mon));
        printf("timeinfo->tm_mday : %d \n", (timeinfo->tm_mday));
        printf("timeinfo->tm_wday : %d \n", (timeinfo->tm_wday));
        printf("timeinfo->tm_yday : %d \n", (timeinfo->tm_yday));
        printf("timeinfo->tm_isdst : %d \n", (timeinfo->tm_isdst));
        printf ( "Current local time and date: %s\n", asctime (timeinfo) ); // 用asctime 打印
        char str[100];
        sprintf(str,"%s\0",asctime (timeinfo)); // 或转字符串存str。
        printf("iiiiiiiiiiiiiiiiiiii : %s\n", str);

        rawtime = FormatTime(tttt, &b, &a);
        printf(" b = %ld, a = %ld\n", b, a);

        /*
        tm 结构成员
        int tm_sec; // 0-61
        int tm_min;  // 0-59int
        tm_hour; // 0-23
        int tm_mday; // 1-31
        int tm_mon;  // 0-11
        int tm_year; // 1900年起
        int tm_wday; // 0-6
        int tm_yday; // 0-365
        int tm_isdst;
        */

        return 0;
}

自己的一些代码：

static int FormatTime(const char * szTime, ASN1_TIME **tmb, ASN1_TIME **tma)

{

        time_t b, a;

        struct tm before, after;

        const char *hms = "000000000000";

        sscanf(szTime, "%4d%2d%2d%4d%2d%2d",

               &before.tm_year,

               &before.tm_mon,

               &before.tm_mday,

               &after.tm_year,

               &after.tm_mon,

               &after.tm_mday);

        sscanf(hms, "%2d%2d%2d%2d%2d%2d",

               &before.tm_hour,

               &before.tm_min,

               &before.tm_sec,

               &after.tm_hour,

               &after.tm_min,

               &after.tm_sec);

        before.tm_year -= 1900;

        before.tm_mon --;

        before.tm_isdst=-1;

        after.tm_year -= 1900;

        after.tm_mon --;

        after.tm_isdst=-1;

        b = mktime(&before);

        a = mktime(&after);

        *tmb = ASN1_TIME_set(*tmb, b);

        *tma = ASN1_TIME_set(*tma, a);

        return 0;

}

static long long FormatTime2(const char * szTime)

{

        double b, a;

        struct tm before, after;

        const char *hms = "000000000000";

        sscanf(szTime, "%4d%2d%2d%4d%2d%2d",

               &before.tm_year,

               &before.tm_mon,

               &before.tm_mday,

               &after.tm_year,

               &after.tm_mon,

               &after.tm_mday);

        sscanf(hms, "%2d%2d%2d%2d%2d%2d",

               &before.tm_hour,

               &before.tm_min,

               &before.tm_sec,

               &after.tm_hour,

               &after.tm_min,

               &after.tm_sec);

        before.tm_year -= 1900;

        before.tm_mon --;

        before.tm_isdst=-1;

        after.tm_year -= 1900;

        after.tm_mon --;

        after.tm_isdst=-1;

        b = mktime(&before);

        a = mktime(&after);

        printf("b = %ld\n", b);

        printf("a = %ld\n", a);

        a = 5000000000;

        printf("a = %ld\n",a);

        //*tmb = ASN1_TIME_set(*tmb, b);

        //*tma = ASN1_TIME_set(*tma, a);

        return (a-b);

}

int leap(int year)

{

    if((year%4==0&&year%100!=0)||(year%400==0))

        return 1;

    else

        return 0;

}

int number(int year,int month ,int day)

{

    int a[12]={31,28,31,30,31,30,31,31,30,31,30,31};

    int b[12]={31,29,31,30,31,30,31,31,30,31,30,31};

    int i,sum=0;

    if(leap(year))

        for(i=0;i<month-1;i++)

            sum+=b[i];

    else

        for(i=0;i<month-1;i++)

            sum+=a[i];

    sum+=day;

    return sum;

}

static long FormatTime3(const char * szTime)

{

    long days = 0;

    long i,btm_year, btm_mon, btm_mday, atm_year, atm_mon, atm_mday, bseq, aseq;

    sscanf(szTime, "%4ld%2ld%2ld%4ld%2ld%2ld",

               &btm_year,

               &btm_mon,

               &btm_mday,

               &atm_year,

               &atm_mon,

               &atm_mday);

        bseq = number(btm_year, btm_mon, btm_mday);

        aseq = number(atm_year, atm_mon, atm_mday);

        for(i = btm_year + 1; i < atm_year; i++)

        {

            if(leap(i))

                days += 366;

            else

                days += 365;

        }

        if(leap(btm_year))

            days = days + (366 - bseq) + aseq;

        else

            days = days + (365 - bseq) + aseq;

        return days;

}

链接：

          http://blog.csdn.net/nanhaizhixin/article/details/8349668

          http://www.eefocus.com/xuefu2009/blog/10-03/187348_f456a.html

          http://www.blogjava.net/Archangelsy/articles/112830.html

          http://zhidao.baidu.com/link?url=65o1q3T71ulItE3-aED6wnoRBtJKd_qe8NGr25t9F0wfSuyjBVV8ERP6Nril7jaE-Zx8EXVsuiLlwmmFz3wCiK