LRESULT CALLBACK GraphDemoWndProc(HWND, UINT, UINT, LONG);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdParam, int nCmdShow)
{
HWND hWnd;
WNDCLASS WndClass;
MSG Msg;
char szClassName[] = "GraphDemo";
WndClass.style = CS_HREDRAW | CS_VREDRAW;
WndClass.lpfnWndProc = GraphDemoWndProc;
WndClass.cbClsExtra = 0;
WndClass.cbWndExtra = 0;
WndClass.hInstance = 0;
WndClass.hCursor = LoadIcon(NULL, IDI_APPLICATION);
WndClass.hIcon = LoadCursor(NULL, IDC_ARROW);
WndClass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
WndClass.lpszMenuName = NULL;
WndClass.lpszClassName = szClassName;
if(!RegisterClass(&WndClass))
{
MessageBox(0, "Can't create window", "Error", MB_OK);
return 0;
}
hWnd = CreateWindow(szClassName, "GraphDemo",
WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);
if(!hWnd)
{
MessageBox(0,"","", MB_OK);
return 0;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
while(GetMessage(&Msg, NULL, 0, 0))
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}
LRESULT CALLBACK GraphDemoWndProc(HWND hWnd, UINT Message, UINT wParam, LONG lParam)
{
HDC hDC, hCompatibleDC;
PAINTSTRUCT PaintStruct;
RECT Rect;
HBITMAP hCompatibleBitmap, hOldBitmap;
HPEN hOldPen;
static HPEN Pens[5];
HBRUSH hOldBrush;
static HBRUSH Brushes[6];
int i;
switch(Message)
{
case WM_PAINT:
randomize();
for(i = 0; i <= 4; i++)
{
Pens[i] = (CreatePen(i, 1, RGB(random(255), random(255), random(255))));
Brushes[i] = (CreateHatchBrush(i, RGB(random(255), random(255),random(255))));
}
GetClientRect(hWnd, &Rect);
hDC = BeginPaint(hWnd, &PaintStruct);
hCompatibleDC = CreateCompatibleDC(hDC);
GetClientRect (hWnd, &Rect);
hCompatibleBitmap = CreateCompatibleBitmap(hDC, Rect.right, Rect.bottom);
hOldBitmap = SelectObject(hCompatibleDC, hCompatibleBitmap);
PatBlt(hCompatibleDC, 0, 0, Rect.right, Rect.bottom, PATCOPY);
for(i = 0; i <= 9999; i++)
SetPixel(hCompatibleDC, random(Rect.right), random(Rect.bottom), RGB(random(255), random(255), random(255)));
for(i=0; i <= 9; i++)
{
hOldPen = SelectObject(hCompatibleDC, Pens(random(4)));
MoveToEx(hCompatibleDC, random(Rect.right, random(Rect.bottom), NULL));
LineTo(hCompatibleDC, random(Rect.right), random(Rect.bottom));
SelectObject(hCompatibleDC, hOldPen);
}
for(i = 0; i <= 5; i++)
{
hOldBrush = SelectObject(hCompatibleDC, Brushes(random(4)));
Rectangle(hCompatibleDC, random(Rect.right),
random(Rect.bottom),
random(Rect.right),
random(Rect.bottom));
Ellipse(hCompatibleDC, random(Rect.right),
random(Rect.bottom),
random(Rect.right),
random(Rect.bottom));
SelectObject(hCompatibleDC, hOldBrush);
}
BitBlt(hDC, PaintStruct.rcPaint.left, PaintStruct.rcPaint.top,
PaintStruct.rcPaint.right,
PaintStruct.rcPaint.bottom,
hCompatibleDC,
PaintStruct.rcPaint.left,
PaintStruct.rcPaint.top,
SRCCOPY);
for(i = 0; i<=4;i++)
{
DeleteObject(Pens[i]);
DeleteObject(Brushes[i]);
}
SelectObject(hCompatibleDC, hOldBitmap);
DeleteObject(hCompatibleBitmap);
DeleteDC(hCompatibleDC);
EndPaint(hWnd, &PaintStruct);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hWnd,Message,wParam, lParam);
}
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Так что скорее всего так: получаешь с помощью GetLocalTime() текущее время и преобразуешь его в номер недели... Нужен алгоритм как? 
