My config.el file for doom emacs. Includes code that switches between a day/night theme depending on the time.

config.el

;;; .doom.d/config.el -*- lexical-binding: t; -*-

;; Place your private configuration here:

;; Color theme changer depending on time
(setq hour
      (string-to-number
       (substring (current-time-string) 11 13))) ;; gets the hour
(if (member hour (number-sequence 6 16)) ;; light theme if between 06:00-16:59
    (setq now 'doom-solarized-light)
  (setq now 'doom-dracula)) ;; dark theme from 5pm
(if (equal now doom-theme)
    nil
  (setq doom-theme now))
;; end of color theme code

;; line numbers
(setq display-line-numbers-type 'relative)
(setq linum-relative-current-symbol "")
;; end of line numbers