時間time_t和string(char*)格式互轉

 

在程式中，我們經常性的會使用到時間格式的轉化，比如講time_t轉化成string，或者反過來轉，下面就是實現的代碼。分為 2009-3-24 和 2009-3-24 0:00:08兩種時間格式。
時間格式：2009-3-24 ：

#include <sys/time.h>
/*
   string to time_t
   時間格式  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)
    {
        API_Error_Log(LM_ERROR, “strDateStr[%s] err “, strDateStr.c_str());
        return -1;
    }
    int iYear = atoi(pBeginPos);
    int iMonth = atoi(pPos + 1);
    pPos = strstr(pPos + 1,“-”);
    if(pPos == NULL)
    {
        API_Error_Log(LM_ERROR, “strDateStr[%s] err “, strDateStr.c_str());
        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;
}

時間格式 2009-3-24 0:00:08 ：

/*
   string to time_t
   時間格式 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,” “);
    //為了相容有些沒精確到時分秒的
    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 時間格式 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;
}

所有的代碼都經過測試，不會有記憶體流失和控制代碼泄漏，可以放心使用~

另附：

結構tm的定義為
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 代表目前秒數，正常範圍為0-59，但允許至61秒
int tm_min 代表目前分數，範圍0-59
int tm_hour 從午夜算起的時數，範圍為0-23
int tm_mday 目前月份的日數，範圍01-31
int tm_mon 代表目前月份，從一月算起，範圍從0-11
int tm_year 從1900 年算起至今的年數
int tm_wday 一星期的日數，從星期一算起，範圍為0-6
int tm_yday 從今年1月1日算起至今的天數，範圍為0-365
int tm_isdst 日光節約時間的旗標

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