1，time_t 转 struct tm
struct tm *localtime( const time_t *timer );
2，struct tm 转 time_t
time_t mktime( struct tm *timeptr );
3，ctime 转 time_t
用ctime类中的gettime成员函数即可
//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;
}