diff --git a/blogex/test/blogex/router_test.exs b/blogex/test/blogex/router_test.exs
index 0e5f985..f082674 100644
--- a/blogex/test/blogex/router_test.exs
+++ b/blogex/test/blogex/router_test.exs
@@ -9,7 +9,8 @@ defmodule Blogex.RouterTest do
     posts = [
       build(id: "first-post", title: "First", tags: ["elixir"], date: ~D[2026-03-10]),
       build(id: "second-post", title: "Second", tags: ["otp"], date: ~D[2026-02-01]),
-      build(id: "draft", published: false, date: ~D[2026-03-12])
+      build(id: "draft", published: false, date: ~D[2026-03-12]),
+      build(id: "future-post", title: "Future", tags: ["elixir"], date: ~D[2099-01-01], published: true)
     ]
 
     {:ok, _} = FakeBlog.start(posts,
@@ -42,6 +43,12 @@ defmodule Blogex.RouterTest do
       assert conn.resp_body =~ "first-post"
       refute conn.resp_body =~ "draft"
     end
+
+    test "excludes future-dated posts from feed" do
+      conn = call(:get, "/feed.xml")
+
+      refute conn.resp_body =~ "future-post"
+    end
   end
 
   describe "GET /atom.xml" do
@@ -75,6 +82,14 @@ defmodule Blogex.RouterTest do
 
       assert conn.status == 200
     end
+
+    test "returns 200 for future-dated post accessed by slug" do
+      conn = call(:get, "/future-post")
+
+      assert conn.status == 200
+      body = Jason.decode!(conn.resp_body)
+      assert body["id"] == "future-post"
+    end
   end
 
   describe "GET /tag/:tag" do
@@ -88,6 +103,14 @@ defmodule Blogex.RouterTest do
       assert hd(body["posts"])["id"] == "first-post"
     end
 
+    test "excludes future-dated posts from tag results" do
+      conn = call(:get, "/tag/elixir")
+
+      body = Jason.decode!(conn.resp_body)
+      ids = Enum.map(body["posts"], & &1["id"])
+      refute "future-post" in ids
+    end
+
     test "returns empty list for unknown tag" do
       conn = call(:get, "/tag/unknown")
 
@@ -113,6 +136,14 @@ defmodule Blogex.RouterTest do
       ids = Enum.map(body["posts"], & &1["id"])
       refute "draft" in ids
     end
+
+    test "excludes future-dated posts from listing" do
+      conn = call(:get, "/")
+
+      body = Jason.decode!(conn.resp_body)
+      ids = Enum.map(body["posts"], & &1["id"])
+      refute "future-post" in ids
+    end
   end
 
   defp get_content_type(conn) do