time_t 与字符串之间的相互转换

方法1， SYSTEMTIME 类型

//指定time_t类型的时间，格式化为YYYYMMDDHH24MISS型的字符串
void FormatTime(SYSTEMTIME &tm1)
{
TCHAR * szTime = new TCHAR[128];
GetLocalTime(&tm1);
_stprintf( szTime, _T("%4.4d-%2.2d-%2.2d %2.2d:%2.2d:%2.2d"),

tm1.wYear, tm1.wMonth+1, tm1.wDay,
tm1.wHour, tm1.wMinute,tm1.wSecond);

delete szTime;
szTime = NULL;
}

//指定YYYYMMDDHH24MISS型的时间，格式化为time_t型的时间
SYSTEMTIME FormatTime2(TCHAR * szTime)
{
SYSTEMTIME tm1;
_stscanf( szTime, _T("%4d-%2d-%2d %2d:%2d:%2d"),
&tm1.wYear,
&tm1.wMonth,
&tm1.wDay,
&tm1.wHour,
&tm1.wMinute,
&tm1.wSecond );
return time1;
}

方法2， time_t类型
//指定time_t类型的时间，格式化为YYYYMMDDHH24MISS型的字符串
void FormatTime(time_t time1, char *szTime)
{
struct tm tm1;

#ifdef WIN32
tm1 = *localtime(&time1);
#else
localtime_r(&time1, &tm1 );
#endif
sprintf( szTime, "%4.4d%2.2d%2.2d%2.2d%2.2d%2.2d",
tm1.tm_year+1900, tm1.tm_mon+1, tm1.tm_mday,
tm1.tm_hour, tm1.tm_min,tm1.tm_sec);
}

//指定YYYYMMDDHH24MISS型的时间，格式化为time_t型的时间
time_t FormatTime2(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;
}