时差转换的陷阱

如果差8个时区,

错误的做法：

time_t rawtime = _mthst.createTime;
tm* timeinfo = new tm;
localtime_s(timeinfo, &rawtime);
timeinfo->tm_year += 1900;
timeinfo->tm_mon += 1;
timeinfo->tm_hour -= 8;

正确的做法

time_t rawtime = _mthst.createTime - 8 * 3600;
tm* timeinfo = new tm;
localtime_s(timeinfo, &rawtime);
timeinfo->tm_year += 1900;
//timeinfo->tm_mday -= 1;
timeinfo->tm_mon += 1;
//timeinfo->tm_hour += 23 - 7;