编译错误之error C3861: “GetDynamicTimeZoneInformation”: 找不到标识符

我的电脑是Win10 64位电脑，用的VS2015编译，出现编译错误，error C3861: “GetDynamicTimeZoneInformation”: 找不到标识符；

该标志符定义在timezoneapi.h中，报错的地方是os.h,这类系统头文件中用到该标志符。我试图将timezoneapi.h该头文件包含进工程目录，发现还是解决不了问题；索性将os.h中的内容更改解决了问题，问题猜想是由于win10系统问题。

inline int utc_minutes_offset(const std::tm& tm = details::os::localtime())
{

#ifdef _WIN32
//#if _WIN32_WINNT < _WIN32_WINNT_WS08                             //注释掉
TIME_ZONE_INFORMATION tzinfo;
auto rv = GetTimeZoneInformation(&tzinfo);
//#else                                                            //注释掉
//    DYNAMIC_TIME_ZONE_INFORMATION tzinfo;                          //注释掉
//    auto rv = GetDynamicTimeZoneInformation(&tzinfo);              //注释掉
//#endif                                                             //注释掉
//    if (rv == TIME_ZONE_ID_INVALID)                                 //注释掉
//        throw spdlog::spdlog_ex("Failed getting timezone info. ", errno);      //注释掉
//
int offset = -tzinfo.Bias;
if (tm.tm_isdst)
offset -= tzinfo.DaylightBias;
else
offset -= tzinfo.StandardBias;
return offset;
#else

#if defined(sun) || defined(__sun)
// 'tm_gmtoff' field is BSD extension and it's missing on SunOS/Solaris
struct helper
{
static long int calculate_gmt_offset(const std::tm & localtm = details::os::localtime(), const std::tm & gmtm = details::os::gmtime())
{
int local_year = localtm.tm_year + (1900 - 1);
int gmt_year = gmtm.tm_year + (1900 - 1);

long int days = (
// difference in day of year
localtm.tm_yday - gmtm.tm_yday

// + intervening leap days
+ ((local_year >> 2) - (gmt_year >> 2))
- (local_year / 100 - gmt_year / 100)
+ ((local_year / 100 >> 2) - (gmt_year / 100 >> 2))

// + difference in years * 365 */
+ (long int)(local_year - gmt_year) * 365
);

long int hours = (24 * days) + (localtm.tm_hour - gmtm.tm_hour);
long int mins = (60 * hours) + (localtm.tm_min - gmtm.tm_min);
long int secs = (60 * mins) + (localtm.tm_sec - gmtm.tm_sec);

return secs;
}
};

long int offset_seconds = helper::calculate_gmt_offset(tm);
#else
long int offset_seconds = tm.tm_gmtoff;
#endif

return static_cast<int>(offset_seconds / 60);
#endif
}

编译提示函数需要有输出，所以只注释掉以上备注有“注释掉”部分代码，使函数有return值。由于系统是windows系统，所以就强制用了#ifdef _WIN32；自此，编译通过。