Set system date and time

In the interface-section you define the procedure:

procedure SetDateTime(Year, Month, Day, Hour, Minu, Sec, MSec: Word);

In the 'implementation' you write...:

{ SetDateTime sets the date and time of the operating system }
procedure SetDateTime(Year, Month, Day, Hour, Minu, Sec, MSec: Word);
var
  NewDateTime: TSystemTime;
begin
  FillChar(NewDateTime, SizeOf(NewDateTime), #0);
  NewDateTime.wYear := Year;
  NewDateTime.wMonth := Month;
  NewDateTime.wDay := Day;
  NewDateTime.wHour := Hour;
  NewDateTime.wMinute := Minu;
  NewDateTime.wSecond := Sec;
  NewDateTime.wMilliseconds := MSec;
  SetLocalTime(NewDateTime);
end;