C++ time_t与string之间转换的工具类

之前在做项目的时候遇到了这个需求，当然baidu到了这个工具类一直忘了分享，现在补上分享，但是出处忘了，如果有博友知道出处，我到时候再补充上。

工具类支持两种格式 一种精确到日，一种精确到秒，如果有其他需求 可以自己修改方法的实现。

#include <string>
#include <sys/time.h>
/*
string to time_t
时间格式  2009-3-24
*/
class Convert_between_string_time_t
{
public :
static  int API_StringToTime(const std::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;
memset((void*)&sourcedate,0,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
*/
static int API_TimeToString(std::string &strDateStr,const time_t &timeData)
{
char chTmp[15];
memset(chTmp,0,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;
};

//    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

/*
string to time_t
时间格式 2009-3-24 0:00:08 或 2009-3-24
*/
static int API_StringToTimeEX(const std::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;
memset((void*)&sourcedate,0,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
*/
static int API_TimeToStringEX(std::string &strDateStr,const time_t &timeData)
{
char chTmp[100];
memset(chTmp,0,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;
}

};