Stoper WORKING

#include <Windows.h>
#include <time.h>
#include <string>

using namespace std;

bool bStart = false;
HWND _TEXT;
clock_t timeStart, timeEnd;

string TimeText(int MS) {
    return to_string((MS / 3600000)) + ":" + to_string((MS / 60000) - ((MS / 3600000) * 60)) + ":" +
        to_string((MS / 1000) - ((MS / 60000) * 60)) + ":" + to_string(MS - ((MS / 1000) * 1000));
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
    switch (msg) {
    case WM_TIMER:
        if (bStart) {
            SetWindowText(_TEXT, TimeText(clock() - timeStart).c_str());
        }
        else {
            SetWindowText(_TEXT, TimeText(timeEnd - timeStart).c_str());
        }
        break;
    case WM_COMMAND:
        switch (wParam) {
        case 100:
            if (!bStart) {
                timeStart = clock();
                bStart = true;
            }
            break;
        case 101:
            if (bStart) {
                timeEnd = clock();
                bStart = false;
            }
            break;
        }
        break;
    case WM_CLOSE:
        DestroyWindow(hwnd);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd, msg, wParam, lParam);
        break;
    }
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR ilCmdLine, int nCmdShow) {
    WNDCLASSEX window;
    MSG msg;
    TCHAR Class_Name[] = TEXT("OKNO_TEST"), Title[] = TEXT("Tytul");
    window.cbClsExtra = NULL;
    window.cbSize = sizeof(WNDCLASSEX);
    window.cbWndExtra = NULL;
    window.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    window.hCursor = LoadCursor(NULL, IDC_HAND);
    window.hIcon = LoadIcon(NULL, IDI_INFORMATION);
    window.hIconSm = NULL;
    window.hInstance = hInstance;
    window.lpfnWndProc = WndProc;
    window.lpszClassName = Class_Name;
    window.lpszMenuName = 0;
    window.style = CS_VREDRAW | CS_HREDRAW;
    RegisterClassEx(&window);

    HWND hwnd = CreateWindowEx(WS_EX_WINDOWEDGE, Class_Name, Title, WS_OVERLAPPEDWINDOW | WS_VISIBLE, CW_USEDEFAULT, CW_USEDEFAULT, 800, 600, NULL, NULL, hInstance, NULL);

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    HWND _START = CreateWindowEx(0, "BUTTON", "Start", WS_CHILD | WS_VISIBLE, 10, 10, 150, 30, hwnd, (HMENU)100, hInstance, NULL);
    HWND _STOP = CreateWindowEx(0, "BUTTON", "Stop", WS_CHILD | WS_VISIBLE, 10, 45, 150, 30, hwnd, (HMENU)101, hInstance, NULL);
    _TEXT = CreateWindowEx(WS_EX_CLIENTEDGE, "EDIT", NULL, WS_CHILD | WS_VISIBLE | WS_BORDER | WS_DISABLED | ES_MULTILINE | ES_AUTOVSCROLL, 165, 10, 200, 65, hwnd, (HMENU)102, hInstance, NULL);
    SendMessage(_TEXT, WM_SETFONT, (WPARAM)CreateFont(35, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, TEXT("Courier New")), 0);

    SetTimer(hwnd, NULL, 20, NULL);

    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    UnregisterClass(Class_Name, hInstance);
    return msg.wParam;
}