>>2085178The background switches between day and the other two based on ai(isday), evening and night switch based on the time. If the sun sets after 23:00 and rises before 7:00, it will switch between day and night instantly. Text starts red at 0:00, reaches the brightest yellow at 12:00 and returns to red at midnight. Grey text switches to white on the same conditions as displaying the night background.
