Vimer的程序世界

在程序中，我们经常性的会使用到时间格式的转化，比如讲time_t转化成string，或者反过来转，下面就是实现的代码。

分为 2009-3-24 和 2009-3-24 0:00:08两种时间格式。
时间格式：2009-3-24 ：

#include <sys/time.h>
/*
    string to time_t
    时间格式  2009-3-24
*/
int API_StringToTime(const string &strDateStr,time_t &timeData)
{
    char *pBeginPos = (char*) strDateStr.c_str();
    char *pPos = strstr(pBeginPos,"-");
    if(pPos == NULL)
    {
        return -1;
    }
    int iYear = atoi(pBeginPos);
    int iMonth = atoi(pPos + 1);

    pPos = strstr(pPos + 1,"-");
    if(pPos == NULL)
    {
        return -1;
    }

    int iDay = atoi(pPos + 1);

    struct tm sourcedate;
    bzero((void*)&sourcedate,sizeof(sourcedate));
    sourcedate.tm_mday = iDay;
    sourcedate.tm_mon = iMonth - 1; 
    sourcedate.tm_year = iYear - 1900;
    
    timeData = mktime(&sourcedate);  

    return 0;
}

/*
    time_t to string
*/
int API_TimeToString(string &strDateStr,const time_t &timeData)
{
    char chTmp[15];
    bzero(chTmp,sizeof(chTmp));

    struct tm *p;
    p = localtime(&timeData);

    p->tm_year = p->tm_year + 1900;

    p->tm_mon = p->tm_mon + 1;


    snprintf(chTmp,sizeof(chTmp),"%04d-%02d-%02d",
        p->tm_year, p->tm_mon, p->tm_mday);

    strDateStr = chTmp;
    return 0;
}

时间格式 2009-3-24 0:00:08 ：

/*
   string to time_t   
   时间格式 2009-3-24 0:00:08 或 2009-3-24
   */
int API_StringToTimeEX(const string &strDateStr,time_t &timeData)
{
    char *pBeginPos = (char*) strDateStr.c_str();
    char *pPos = strstr(pBeginPos,"-");
    if(pPos == NULL)
    {
        printf("strDateStr[%s] err \n", strDateStr.c_str());
        return -1;
    }
    int iYear = atoi(pBeginPos);
    int iMonth = atoi(pPos + 1);
    pPos = strstr(pPos + 1,"-");
    if(pPos == NULL)
    {
        printf("strDateStr[%s] err \n", strDateStr.c_str());
        return -1;
    }
    int iDay = atoi(pPos + 1);
    int iHour=0;
    int iMin=0;
    int iSec=0;
    pPos = strstr(pPos + 1," ");
    //为了兼容有些没精确到时分秒的
    if(pPos != NULL)
    {
        iHour=atoi(pPos + 1);
        pPos = strstr(pPos + 1,":");
        if(pPos != NULL)
        {
            iMin=atoi(pPos + 1);
            pPos = strstr(pPos + 1,":");
            if(pPos != NULL)
            {
                iSec=atoi(pPos + 1);
            }
        }
    }

    struct tm sourcedate;
    bzero((void*)&sourcedate,sizeof(sourcedate));
    sourcedate.tm_sec = iSec;
    sourcedate.tm_min = iMin; 
    sourcedate.tm_hour = iHour;
    sourcedate.tm_mday = iDay;
    sourcedate.tm_mon = iMonth - 1; 
    sourcedate.tm_year = iYear - 1900;
    timeData = mktime(&sourcedate);  
    return 0;
}
/*
   time_t to string 时间格式 2009-3-24 0:00:08 
   */
int API_TimeToStringEX(string &strDateStr,const time_t &timeData)
{
    char chTmp[100];
    bzero(chTmp,sizeof(chTmp));
    struct tm *p;
    p = localtime(&timeData);
    p->tm_year = p->tm_year + 1900;
    p->tm_mon = p->tm_mon + 1;

    snprintf(chTmp,sizeof(chTmp),"%04d-%02d-%02d %02d:%02d:%02d",
            p->tm_year, p->tm_mon, p->tm_mday,p->tm_hour,p->tm_min,p->tm_sec);
    strDateStr = chTmp;
    return 0;
}

所有的代码都经过测试，不会有内存泄漏和句柄泄漏，可以放心使用~
另附：
结构tm的定义为:

struct tm
{
int tm_sec;
int tm_min;
int tm_hour;
int tm_mday;
int tm_mon;
int tm_year;
int tm_wday;
int tm_yday;
int tm_isdst;
};
int tm_sec 代表目前秒数，正常范围为0-59，但允许至61秒
int tm_min 代表目前分数，范围0-59
int tm_hour 从午夜算起的时数，范围为0-23
int tm_mday 目前月份的日数，范围01-31
int tm_mon 代表目前月份，从一月算起，范围从0-11
int tm_year 从1900 年算起至今的年数
int tm_wday 一星期的日数，从星期一算起，范围为0-6
int tm_yday 从今年1月1日算起至今的天数，范围为0-365
int tm_isdst 日光节约时间的旗标