This tool is called WinDynamicDesktop and is created by Reddit user t1m0thyjDevelopmentof. He hopes that this function on macOS can also be experienced on Windows 10 system, so he developed this software. This software is easy to install, has a minimal memory footprint, and appears in the system tray after installation.
The most important function of WinDynamicDesktop is to automatically divide the sunset and sunrise time according to the user's current time zone, and then let the user customize the wallpaper for two time periods. Currently this application provides 16 wallpapers extracted from macOS Mojave, users can use it as new wallpaper in the settings. But you can't use your own wallpaper at the moment, but t1m0thyj is still under development and will add this feature in the future.