diff --git a/client/gen.exs b/client/gen.exs
index 5c160f8..3cfdd86 100644
--- a/client/gen.exs
+++ b/client/gen.exs
@@ -81,8 +81,13 @@ constructLocalPath = fn p -> dateFolder.(p) <> normalize_title.(Map.get(p, :titl
 post_contents = Enum.concat(post_contents_custom, post_contents_org)
   |> Enum.map(fn postMap -> Map.merge(postMap, %{localpath: (constructLocalPath.(postMap))}) end)
 
-index_file = post_contents
-  |> Enum.sort_by(fn m -> Map.get(m, :date) |> (fn d -> Enum.find_index(months, &(&1 == String.slice(d, 8..10))) end).() end)
+index_file =
+  post_contents
+  |> Enum.sort_by(
+    &(Map.get(&1, :date)
+      |> String.slice(5..6)
+      |> Integer.parse())
+  )
   |> Enum.reverse()
   # Group by month
   |> Enum.group_by(fn m -> Map.get(m, :date) |> String.slice(8..15) end)