vimrc: set color theme according to hour

vim/vimrc

@@ -40,8 +40,14 @@ endif
 
 " Themes
 syntax on
-set background=dark
-colorscheme OceanicNext
+if strftime("%H") > 7 && strftime("%H") < 18
+  set background=light
+  colorscheme fruchtig
+else
+  set background=dark
+  colorscheme OceanicNext
+end
+
 if (has("termguicolors"))
   set termguicolors
 endif