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Find out the boot time of Windows of any version
A programmatic way to get the desktop load time on a cold start of the system, examples of functions and the simplest utility.
Weekend creativity :)

Description of the function: A method of receiving a notification about the full load of the desktop at system startup.

int GetTimeLoadWorktable(){
    NOTIFYICONDATA tnd  = {0};
    tnd.cbSize          = sizeof(NOTIFYICONDATA);
    tnd.hWnd            = (HWND)101010;
    tnd.uID             = (UINT)GetModuleHandle(NULL);
    //--
    while (Shell_NotifyIcon(NIM_ADD, &tnd) == 0) {Sleep(1000);}
    Shell_NotifyIcon(NIM_DELETE, &tnd);
    return GetTickCount() / 1000;
}

Utility example, C language. Get system and desktop boot time when starting from Windows OS

#include <stdio.h>
#include <windows.h>

/*  Declare Windows procedure  */
int GetTimeLoadWorktable();


int APIENTRY WinMain( HINSTANCE hInst, HINSTANCE hPrev, LPSTR lpCmdLine, int nCmdShow )
{
    char str[64];
	int re = GetTimeLoadWorktable();
	sprintf(str, "%s %d %s", "OS boot time:  ", re, " sec.");
	MessageBox(NULL, str, "OS is fully loaded", MB_OK);
	return 0;
}


int GetTimeLoadWorktable(){
    NOTIFYICONDATA tnd  = {0};
    tnd.cbSize          = sizeof(NOTIFYICONDATA);
    tnd.hWnd            = (HWND)101010;
    tnd.uID             = (UINT)GetModuleHandle(NULL);
    //--
    while (Shell_NotifyIcon(NIM_ADD, &tnd) == 0) {Sleep(1000);}
    Shell_NotifyIcon(NIM_DELETE, &tnd);
    return GetTickCount() / 1000;
}

Function example for VB6:

Function GetTimeLoadWorktable() As Single
    Dim ti As NOTIFYICONDATA
    ti.cbSize = Len(ti)
    ti.uId = GetModuleHandle(ByVal 0)
    '--------
    While Shell_NotifyIcon(NIM_ADD, ti) = 0
        Sleep 1000
    Wend
    '--------
    Call Shell_NotifyIcon(NIM_DELETE, ti)
    GetTimeLoadWorktable = GetTickCount()
End Function