Navigate to Settings > General (or System) > Date & Time and enable "24-Hour Time." Conclusion
While your taskbar has a built-in clock, many users prefer a dedicated desktop "skin" or widget for better visibility. 24 hour clock download
This is the gold standard for desktop customization. You can download "skins" that feature minimalist, large-scale 24-hour clocks that stay pinned to your wallpaper. Navigate to Settings > General (or System) >