I’ve been a long-time Notepad++ user, and recently found myself frequently working both indoors and outdoors on a laptop. Constantly switching between light and dark mode through Preferences became a bit tedious, so I initially wrote some Python scripts to automate it — but eventually decided to build a proper solution.

I’ve created a C++ plugin that adds three toolbar buttons:

☀️ Light Mode — instantly switch to light mode
🌙 Dark Mode — instantly switch to dark mode
🔄 Auto Mode — automatically switches based on sunrise/sunset times calculated from your selected location
The auto mode uses a built-in list of 50+ cities worldwide (or custom coordinates) to determine when to flip between themes — no external dependencies or internet connection required.

More details, screenshots, and the installer can be found on the GitHub page: 👉 https://github.com/pullitall/Notepadpp-light-dark-switch-and-automatic-switch-based-on-location

If you run into any bugs, feel free to post here or open an issue on GitHub. Any feedback is greatly appreciated!