string与time_t互相转换

#include <time.h>
#include <string>
#include <iostream>
using namespace std;

time_t string2time_t(const string string_time);
string time_t2string(const time_t time_t_time);
int main()
{
    string strTime = "2014/03/28 18:25:26";
    time_t time1 = string2time_t(strTime);
    cout<<time1<<endl;
    
    time_t time2 = time(NULL);
    string strNowTime = time_t2string(time2);
    cout<<strNowTime<<endl;
    getchar();

    return 1;
}

//string 转换为time_t  时间格式为2014/03/28 18:25:26
time_t string2time_t(const string string_time)
{
    tm tm1;
    memset(&tm1, 0, sizeof(tm1));
    time_t time1;

    sscanf_s(string_time.c_str(), "%d/%d/%d/ %d:%d:%d",
        &(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 -= 1;

    time1 = mktime(&tm1);

    return time1;

}

//time_t转换为string  时间格式为2014/03/28 18:25:26
string time_t2string(const time_t time_t_time)
{
    char szTime[100] = {'\0'};

    tm *pTm = new tm;
    localtime_s(pTm, &time_t_time);
    //pTm = localtime(&time_t_time);
    pTm->tm_year += 1900;
    pTm->tm_mon +=1;

    sprintf_s(szTime, "%04d/%02d/%02d %02d:%02d:%02d",
        pTm->tm_year,
        pTm->tm_mon,
        pTm->tm_mday,
        pTm->tm_hour,
        pTm->tm_min,
        pTm->tm_sec);

    string strTime = szTime;

    delete pTm;
    pTm = NULL;

    return strTime;
}