A package which integrates with the Night Light-feature of your GNOME desktop.
Changing theme according to the time of day.
(defun theme-changer (state)
(if state
(my/set-dark-theme)
(my/set-light-theme)))
(require 'gnome-night-light)
(setq gnome-night-light/light-change-callback #'theme-changer)
(gnome-night-light)
The callback passed to gnome-night-light has to accept a boolean variable.
This variable is t when the night light is active.
GPLv3+