Quote:Windows 10 Auto-Night-Mode is a free open source program for Microsoft's Windows 10 operating system to switch between light and dark mode automatically.

Microsoft introduced dark theme support in Windows 10 and improved the mode in recent versions of the operating system; File Explorer or Firefox, use the dark theme when selected by the user or administrator.

The operating system supports switching between light and dark themes. All you have to do is open the Settings application, e.g. with the shortcut Windows-I, to do so under Personalization > Colors > Choose your default app mode.

While you may enable light or dark mode there, you will notice that you cannot set modes based on the time of day.

Enter Windows 10 Auto Night-Mode. The free application uses the Task Scheduler to switch between the two themes automatically.

Full reading: https://www.ghacks.net/2018/12/02/windows-10-switch-between-light-and-dark-mode-automatically/