static VOID
SetLocalSystemTime(HWND hwnd)
{
SYSTEMTIME Time;
if (DateTime_GetSystemtime(GetDlgItem(hwnd,
IDC_TIMEPICKER),
&Time) == GDT_VALID &&
SendMessageW(GetDlgItem(hwnd,
IDC_MONTHCALENDAR),
MCCM_GETDATE,
(WPARAM)&Time,
0))
{
SystemSetLocalTime(&Time);
SetWindowLongPtrW(hwnd,
DWL_MSGRESULT,
PSNRET_NOERROR);
SendMessageW(GetDlgItem(hwnd,
IDC_MONTHCALENDAR),
MCCM_RESET,
(WPARAM)&Time,
0);
/* Broadcast the time change message */
SendMessageW(HWND_BROADCAST,
WM_TIMECHANGE,
0,
0);
}
}
/*
* NTP servers state the number of seconds passed since
* 1st Jan, 1900. The time returned from the server
* needs adding to that date to get the current Gregorian time
*/
static VOID
UpdateSystemTime(ULONG ulTime)
{
FILETIME ftNew;
LARGE_INTEGER li;
SYSTEMTIME stNew;
/* Time at 1st Jan 1900 */
stNew.wYear = 1900;
stNew.wMonth = 1;
stNew.wDay = 1;
stNew.wHour = 0;
stNew.wMinute = 0;
stNew.wSecond = 0;
stNew.wMilliseconds = 0;
/* Convert to a file time */
if (!SystemTimeToFileTime(&stNew, &ftNew))
{
DisplayWin32Error(GetLastError());
return;
}
/* Add on the time passed since 1st Jan 1900 */
li = *(LARGE_INTEGER *)&ftNew;
li.QuadPart += (LONGLONG)10000000 * ulTime;
ftNew = * (FILETIME *)&li;
/* Convert back to a system time */
if (!FileTimeToSystemTime(&ftNew, &stNew))
{
DisplayWin32Error(GetLastError());
return;
}
if (!SystemSetLocalTime(&stNew))
DisplayWin32Error(GetLastError());
}