#include <windows.h>

#include <winsock.h>
#include <time.h>
#pragma comment (lib,"Ws2_32")

struct?? NTP_Packet{
int?? Control_Word;??
int?? root_delay;??
int?? root_dispersion;??
int?? reference_identifier;??
__int64?? reference_timestamp;??
__int64?? originate_timestamp;??
__int64?? receive_timestamp;??
int?? transmit_timestamp_seconds;??
int?? transmit_timestamp_fractions;??
};

int APIENTRY WinMain(HINSTANCE hInstance,
???????????????????? HINSTANCE hPrevInstance,
???????????????????? LPSTR???? lpCmdLine,
???????????????????? int?????? nCmdShow)
{
WORD wVersionRequested;
WSADATA wsaData;

wVersionRequested = MAKEWORD( 1, 1 );
if (0!=WSAStartup(wVersionRequested, &wsaData))
{
?? WSACleanup();
?? return 0;
}

if (LOBYTE(wsaData.wVersion)!=1 || HIBYTE(wsaData.wVersion)!=1)
{
?? WSACleanup( );
?? return 0;
}
SOCKET soc=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);

struct sockaddr_in addrSrv;
addrSrv.sin_addr.S_un.S_addr=inet_addr("192.43.244.18");
addrSrv.sin_family=AF_INET;
addrSrv.sin_port=htons(123);

NTP_Packet NTP_Send,NTP_Recv;
NTP_Send.Control_Word?? =?? htonl(0x0B000000);??
NTP_Send.root_delay?? =?? 0;??
NTP_Send.root_dispersion?? =?? 0;??
NTP_Send.reference_identifier?? =?? 0;??
NTP_Send.reference_timestamp?? =?? 0;??
NTP_Send.originate_timestamp?? =?? 0;??
NTP_Send.receive_timestamp?? =?? 0;??
NTP_Send.transmit_timestamp_seconds?? =?? 0;??
NTP_Send.transmit_timestamp_fractions?? =?? 0;

if(SOCKET_ERROR==sendto(soc,(const char*)&NTP_Send,sizeof(NTP_Send),
?? 0,(struct sockaddr*)&addrSrv,sizeof(addrSrv)))
{
?? closesocket(soc);
?? return 0;
}
int sockaddr_Size =sizeof(addrSrv);
if(SOCKET_ERROR==recvfrom(soc,(char*)&NTP_Recv,sizeof(NTP_Recv),
?? 0,(struct sockaddr*)&addrSrv,&sockaddr_Size))
{
?? closesocket(soc);
?? return 0;
}
closesocket(soc);
WSACleanup();

SYSTEMTIME newtime;
struct tm *lpLocalTime;
float Splitseconds;
time_t ntp_time=ntohl(NTP_Recv.transmit_timestamp_seconds)-2208988800;
lpLocalTime=localtime(&ntp_time);
if(lpLocalTime==NULL)
{
?? return 0;
}

newtime.wYear????? =lpLocalTime->tm_year+1900;??
newtime.wMonth???? =lpLocalTime->tm_mon+1;
newtime.wDayOfWeek =lpLocalTime->tm_wday;
newtime.wDay?????? =lpLocalTime->tm_mday;??
newtime.wHour????? =lpLocalTime->tm_hour;??
newtime.wMinute??? =lpLocalTime->tm_min;??
newtime.wSecond??? =lpLocalTime->tm_sec;

Splitseconds=(float)ntohl(NTP_Recv.transmit_timestamp_fractions);??
Splitseconds=(float)0.000000000200 * Splitseconds;??
Splitseconds=(float)1000.0 * Splitseconds;??
newtime.wMilliseconds?? =?? (unsigned?? short)Splitseconds;??
SetLocalTime(&newtime);
return 0;
}