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Home Manager automatically changing dark/light mode at sunrise/set:
Firstly, to do this you need pkgs.sunwait (though other options would work with a bit of changing). Make a script like this, I put mine in my home.file, but you can also just make it a file on it's own.
'scripts/mode-switcher-based-on-sunlight.sh' = {
			text = ''
				run_a_command() {
					if [[ "$light" == "DAY" ]]; then
						sed -i 's/MODE\ =\ ".*"/MODE\ =\ "light"/' $HOME/.config/home/home.nix
						home-manager switch
					else
						sed -i 's/MODE\ =\ ".*"/MODE\ =\ "dark"/' $HOME/.config/home/home.nix
						home-manager switch
					fi
				};
				#!/bin/bash
				# Set your latitude and longitude
				LATITUDE="53.43N"
				LONGITUDE="-1.89E"

				# Calculate the sunrise and sunset times for today using sunwait
				light=$(sunwait poll $LATITUDE $LONGITUDE)

				run_a_command
				while sleep 5; do
					new_light=$(sunwait poll $LATITUDE $LONGITUDE)
					if [[ "$new_light" != "$light" ]]; then
						run_a_command
					fi
				done
			'';
			executable = true;
		};



I have this to autorun on startup in Hyprland with 
exec-once="$HOME/scripts/mode-switcher-based-on-sunlight.sh";
 then in the home.nix, I of course have a variable defined called MODE as either "dark" or "light"


	{config, pkgs, lib, ...}:
	let 
		MODE = "light";
	in
	{
		# Home config
	}


And then that should be it, of course you'll want to make to make gtk follow this theme, I do that by having different theme files which each define a set of GTK themes and then those are assigned as variables on rebuild 
	inherit (import ./themes/\${THEME}_\${MODE}.nix) GTK_THEME GTK_THEME_NAME;

You can see my full nix configurations here
Fly You High - DeaDvey
Published: 15b/7e8 at c730