// C++ program to find GetTimeZoneInformation

#include<ctime>
#include<stdio.h>
#include<winbase.h>

int main()
{
int ret;

/* From MSDN https://msdn.microsoft.com/en-us/library/windows/desktop/ms724950(v=vs.85).aspx
typedef struct _SYSTEMTIME {
  WORD wYear;
  WORD wMonth;
  WORD wDayOfWeek;
  WORD wDay;
  WORD wHour;
  WORD wMinute;
  WORD wSecond;
  WORD wMilliseconds;
} SYSTEMTIME, *PSYSTEMTIME;

From MSDN https://msdn.microsoft.com/en-us/library/windows/desktop/ms725481(v=vs.85).aspx

typedef struct _TIME_ZONE_INFORMATION {
  LONG       Bias;
  WCHAR      StandardName[32];
  SYSTEMTIME StandardDate;
  LONG       StandardBias;
  WCHAR      DaylightName[32];
  SYSTEMTIME DaylightDate;
  LONG       DaylightBias;
} TIME_ZONE_INFORMATION, *PTIME_ZONE_INFORMATION;

*/

/* From: https://social.msdn.microsoft.com/Forums/vstudio/en-US/8cd25fa0-391e-4677-8c5d-15bbe9d389c9
   /reading-timezone-binary-data-from-registry-and-using-it?forum=netfxbcl
typedef struct SYSTEMTIME_TZI {
  wchar wYear;
  wchar wMonth;
  wchar wDay;
  wchar wHour;
  wchar wMinute;
  wchar wSecond;
  wchar wMilliseconds;
  wchar wDayOfWeek;
}

typedef struct _TIME_ZONE_INFORMATION {
  long       Bias;
  char      StandardName[32];
  SYSTEMTIME StandardDate;
  long       StandardBias;
  char      DaylightName[32];
  SYSTEMTIME DaylightDate;
  long       DaylightBias;
} TIME_ZONE_INFORMATION, *PTIME_ZONE_INFORMATION;
*/

// Get the timezone info.
TIME_ZONE_INFORMATION TimeZoneInfo;
ret = GetTimeZoneInformation( &TimeZoneInfo );

printf("GetTimeZoneInformation returns %d,\n", ret);

printf("DaylightDate.wYear is '%d'.\n", TimeZoneInfo.DaylightDate.wYear);
printf("DaylightDate.wMonth is '%d'.\n", TimeZoneInfo.DaylightDate.wMonth);
printf("DaylightDate.wDay is '%d'.\n", TimeZoneInfo.DaylightDate.wDay);
printf("DaylightDate.wHour is '%d'.\n", TimeZoneInfo.DaylightDate.wHour);
printf("DaylightDate.wMinute is '%d'.\n", TimeZoneInfo.DaylightDate.wMinute);
printf("DaylightDate.wSecond is '%d'.\n", TimeZoneInfo.DaylightDate.wSecond);
printf("DaylightDate.wMilliseconds is '%d'.\n", TimeZoneInfo.DaylightDate.wMilliseconds);
printf("DaylightDate.wDayOfWeek is '%d'.\n", TimeZoneInfo.DaylightDate.wDayOfWeek);

printf("StandardDate.wYear is '%d'.\n", TimeZoneInfo.StandardDate.wYear);
printf("StandardDate.wMonth is '%d'.\n", TimeZoneInfo.StandardDate.wMonth);
printf("StandardDate.wDay is '%d'.\n", TimeZoneInfo.StandardDate.wDay);
printf("StandardDate.wHour is '%d'.\n", TimeZoneInfo.StandardDate.wHour);
printf("StandardDate.wMinute is '%d'.\n", TimeZoneInfo.StandardDate.wMinute);
printf("StandardDate.wSecond is '%d'.\n", TimeZoneInfo.StandardDate.wSecond);
printf("StandardDate.wMilliseconds is '%d'.\n", TimeZoneInfo.StandardDate.wMilliseconds);
printf("StandardDate.wDayOfWeek is '%d'.\n", TimeZoneInfo.StandardDate.wDayOfWeek);

  return 0;
}