diff --git a/lib/chronoscope/nts.ex b/lib/chronoscope/nts.ex
index cd4edf9..2d76414 100644
--- a/lib/chronoscope/nts.ex
+++ b/lib/chronoscope/nts.ex
@@ -19,6 +19,7 @@ defmodule Chronoscope.NTS do
     |> Enum.map(fn {_, pid, _, _} -> GenServer.call(pid, :list) end)
   end
 
+  @impl true
   def key_establishment(host, port) do
     name = "#{host}:#{port}"
 
diff --git a/lib/chronoscope/nts/key_establishment_client.ex b/lib/chronoscope/nts/key_establishment_client.ex
index 67b606d..f7f5107 100644
--- a/lib/chronoscope/nts/key_establishment_client.ex
+++ b/lib/chronoscope/nts/key_establishment_client.ex
@@ -37,12 +37,7 @@ defmodule Chronoscope.NTS.KeyEstablishmentClient do
     receive do
       {:ssl, _socket, response} ->
         :ssl.close(socket)
-
-        case KeyEstablishmentResponse.parse(response) do
-          {:ok, parsed_response} -> {:ok, Map.put(parsed_response, :cert_expiration, Certificate.expiration_date(peercert))}
-          # todo - indicate errors in server response
-          error -> error
-        end
+        parse_response(response, peercert)
 
       msg ->
         :ssl.close(socket)
@@ -56,6 +51,13 @@ defmodule Chronoscope.NTS.KeyEstablishmentClient do
     end
   end
 
+  defp parse_response(response, peercert) do
+    response
+    |> KeyEstablishmentResponse.parse()
+    |> Map.put(:cert_expiration, Certificate.expiration_date(peercert))
+    |> then(&{:ok, &1})
+  end
+
   defp handshake_failure_message(error) do
     cond do
       error =~ ~r/\{bad_cert,hostname_check_failed\}$/ ->
diff --git a/lib/chronoscope/nts/key_establishment_response.ex b/lib/chronoscope/nts/key_establishment_response.ex
index 19941a6..5a4bff6 100644
--- a/lib/chronoscope/nts/key_establishment_response.ex
+++ b/lib/chronoscope/nts/key_establishment_response.ex
@@ -17,7 +17,7 @@ defmodule Chronoscope.NTS.KeyEstablishmentResponse do
   }
 
   def parse(response) do
-    {:ok, parse_response(response, %{})}
+    parse_response(response, %{})
   end
 
   defp parse_response([], acc) do
diff --git a/lib/chronoscope_web/controllers/page_html/home.html.heex b/lib/chronoscope_web/controllers/page_html/home.html.heex
index 60b5231..cbd01fd 100644
--- a/lib/chronoscope_web/controllers/page_html/home.html.heex
+++ b/lib/chronoscope_web/controllers/page_html/home.html.heex
@@ -1,6 +1,12 @@
 <.flash_group flash={@flash} />
 <div class="left-[40rem] fixed inset-y-0 right-0 z-0 hidden lg:block xl:left-[50rem]">
-  <svg viewBox="0 0 1480 957" fill="none" aria-hidden="true" class="absolute inset-0 h-full w-full" preserveAspectRatio="xMinYMid slice">
+  <svg
+    viewBox="0 0 1480 957"
+    fill="none"
+    aria-hidden="true"
+    class="absolute inset-0 h-full w-full"
+    preserveAspectRatio="xMinYMid slice"
+  >
     <path fill="#EE7868" d="M0 0h1480v957H0z" />
     <path
       d="M137.542 466.27c-582.851-48.41-988.806-82.127-1608.412 658.2l67.39 810 3083.15-256.51L1535.94-49.622l-98.36 8.183C1269.29 281.468 734.115 515.799 146.47 467.012l-8.928-.742Z"
@@ -59,7 +65,8 @@
             href="https://hexdocs.pm/phoenix/overview.html"
             class="group relative rounded-2xl px-6 py-4 text-sm font-semibold leading-6 text-zinc-900 sm:py-6"
           >
-            <span class="absolute inset-0 rounded-2xl bg-zinc-50 transition group-hover:bg-zinc-100 sm:group-hover:scale-105"></span>
+            <span class="absolute inset-0 rounded-2xl bg-zinc-50 transition group-hover:bg-zinc-100 sm:group-hover:scale-105">
+            </span>
             <span class="relative flex items-center gap-4 sm:flex-col">
               <svg viewBox="0 0 24 24" fill="none" aria-hidden="true" class="h-6 w-6">
                 <path d="m12 4 10-2v18l-10 2V4Z" fill="#18181B" fill-opacity=".15" />
@@ -78,7 +85,8 @@
             href="https://github.com/phoenixframework/phoenix"
             class="group relative rounded-2xl px-6 py-4 text-sm font-semibold leading-6 text-zinc-900 sm:py-6"
           >
-            <span class="absolute inset-0 rounded-2xl bg-zinc-50 transition group-hover:bg-zinc-100 sm:group-hover:scale-105"></span>
+            <span class="absolute inset-0 rounded-2xl bg-zinc-50 transition group-hover:bg-zinc-100 sm:group-hover:scale-105">
+            </span>
             <span class="relative flex items-center gap-4 sm:flex-col">
               <svg viewBox="0 0 24 24" aria-hidden="true" class="h-6 w-6">
                 <path
@@ -95,7 +103,8 @@
             href={"https://github.com/phoenixframework/phoenix/blob/v#{Application.spec(:phoenix, :vsn)}/CHANGELOG.md"}
             class="group relative rounded-2xl px-6 py-4 text-sm font-semibold leading-6 text-zinc-900 sm:py-6"
           >
-            <span class="absolute inset-0 rounded-2xl bg-zinc-50 transition group-hover:bg-zinc-100 sm:group-hover:scale-105"></span>
+            <span class="absolute inset-0 rounded-2xl bg-zinc-50 transition group-hover:bg-zinc-100 sm:group-hover:scale-105">
+            </span>
             <span class="relative flex items-center gap-4 sm:flex-col">
               <svg viewBox="0 0 24 24" fill="none" aria-hidden="true" class="h-6 w-6">
                 <path d="M12 1v6M12 17v6" stroke="#18181B" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
diff --git a/test/chronoscope/nts/certificate_test.exs b/test/chronoscope/nts/certificate_test.exs
index 53cd835..1f1b95c 100644
--- a/test/chronoscope/nts/certificate_test.exs
+++ b/test/chronoscope/nts/certificate_test.exs
@@ -18,7 +18,10 @@ defmodule Chronoscope.NTS.CertificateTest do
         |> expiration_date()
         |> DateTime.from_iso8601()
 
-      assert DateTime.diff(expiration, DateTime.utc_now(), :day) == 12
+      expiration_time_in_minutes = DateTime.diff(expiration, DateTime.utc_now(), :minute)
+
+      assert expiration_time_in_minutes > 12 * 24 * 60 - 5
+      assert expiration_time_in_minutes < 12 * 24 * 60 + 5
     end
   end
 
diff --git a/test/chronoscope/nts/key_establishment_response_test.exs b/test/chronoscope/nts/key_establishment_response_test.exs
index e52e8f6..4d88e9f 100644
--- a/test/chronoscope/nts/key_establishment_response_test.exs
+++ b/test/chronoscope/nts/key_establishment_response_test.exs
@@ -5,95 +5,101 @@ defmodule Chronoscope.NTS.KeyEstablishmentResponseTest do
 
   describe "Chronoscope.NTS.KeyEstablishmentResponse.parse()" do
     test "handles empty response" do
-      assert parse([]) == {:ok, %{}}
+      assert parse([]) == %{}
     end
 
     test "ignores unkown record" do
-      assert parse([0x80, 0x21, 0x00, 0x04, 0x00, 0x01, 0x02, 0x03]) == {:ok, %{}}
+      assert parse([0x80, 0x21, 0x00, 0x04, 0x00, 0x01, 0x02, 0x03]) == %{}
     end
 
     test "handles end of message record" do
-      assert parse([0x80, 0x00, 0x00, 0x00]) == {:ok, %{}}
+      assert parse([0x80, 0x00, 0x00, 0x00]) == %{}
     end
 
     test "handles next protocol negotiation record" do
-      assert parse([0x80, 0x01, 0x00, 0x02, 0x00, 0x00]) == {:ok, %{next_protocols: ["NTPv4"]}}
+      assert parse([0x80, 0x01, 0x00, 0x02, 0x00, 0x00]) == %{next_protocols: ["NTPv4"]}
     end
 
     test "does not handle next protocol negotiation record without critical bit" do
-      assert parse([0x00, 0x01, 0x00, 0x02, 0x00, 0x00]) == {:ok, %{}}
+      assert parse([0x00, 0x01, 0x00, 0x02, 0x00, 0x00]) == %{}
     end
 
     test "handles empty next protocols" do
-      assert parse([0x80, 0x01, 0x00, 0x00]) == {:ok, %{next_protocols: []}}
+      assert parse([0x80, 0x01, 0x00, 0x00]) == %{next_protocols: []}
     end
 
     test "handles multiple next protocols" do
-      assert parse([0x80, 0x01, 0x00, 0x06, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00]) ==
-               {:ok, %{next_protocols: ["NTPv4", "UNASSIGNED", "NTPv4"]}}
+      assert parse([0x80, 0x01, 0x00, 0x06, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00]) == %{
+               next_protocols: ["NTPv4", "UNASSIGNED", "NTPv4"]
+             }
     end
 
     test "handles aead algorithm negotiation record" do
-      assert parse([0x80, 0x04, 0x00, 0x02, 0x00, 0x0F]) == {:ok, %{aead_algorithms: ["AEAD_AES_SIV_CMAC_256"]}}
+      assert parse([0x80, 0x04, 0x00, 0x02, 0x00, 0x0F]) == %{aead_algorithms: ["AEAD_AES_SIV_CMAC_256"]}
     end
 
     test "handles aead algorithm negotiation record without critical bit" do
-      assert parse([0x00, 0x04, 0x00, 0x02, 0x00, 0x1E]) == {:ok, %{aead_algorithms: ["AEAD_AES_128_GCM_SIV"]}}
+      assert parse([0x00, 0x04, 0x00, 0x02, 0x00, 0x1E]) == %{aead_algorithms: ["AEAD_AES_128_GCM_SIV"]}
     end
 
     test "handles empty aead algorithms" do
-      assert parse([0x80, 0x04, 0x00, 0x00]) == {:ok, %{aead_algorithms: []}}
+      assert parse([0x80, 0x04, 0x00, 0x00]) == %{aead_algorithms: []}
     end
 
     test "handles multiple aead algorithms" do
-      assert parse([0x80, 0x04, 0x00, 0x06, 0x00, 0x1E, 0x00, 0x01, 0x00, 0x0F]) ==
-               {:ok, %{aead_algorithms: ["AEAD_AES_SIV_CMAC_256", "UNKNOWN", "AEAD_AES_128_GCM_SIV"]}}
+      assert parse([0x80, 0x04, 0x00, 0x06, 0x00, 0x1E, 0x00, 0x01, 0x00, 0x0F]) == %{
+               aead_algorithms: ["AEAD_AES_SIV_CMAC_256", "UNKNOWN", "AEAD_AES_128_GCM_SIV"]
+             }
     end
 
     test "handles error record" do
-      assert parse([0x80, 0x02, 0x00, 0x02, 0x00, 0x01]) == {:ok, %{error: "Bad Request"}}
+      assert parse([0x80, 0x02, 0x00, 0x02, 0x00, 0x01]) == %{error: "Bad Request"}
     end
 
     test "handles unknown error record" do
-      assert parse([0x80, 0x02, 0x00, 0x02, 0x00, 0x99]) == {:ok, %{error: "153"}}
+      assert parse([0x80, 0x02, 0x00, 0x02, 0x00, 0x99]) == %{error: "153"}
     end
 
     test "does not handle error record without critical bit" do
-      assert parse([0x00, 0x02, 0x00, 0x02, 0x00, 0x01]) == {:ok, %{}}
+      assert parse([0x00, 0x02, 0x00, 0x02, 0x00, 0x01]) == %{}
     end
 
     test "handles warning record" do
-      assert parse([0x80, 0x03, 0x00, 0x02, 0x00, 0x01]) == {:ok, %{warning: "1"}}
+      assert parse([0x80, 0x03, 0x00, 0x02, 0x00, 0x01]) == %{warning: "1"}
     end
 
     test "does not handle warning record without critical bit" do
-      assert parse([0x00, 0x03, 0x00, 0x02, 0x00, 0x01]) == {:ok, %{}}
+      assert parse([0x00, 0x03, 0x00, 0x02, 0x00, 0x01]) == %{}
     end
 
     test "handles server record" do
-      assert parse([0x80, 0x06, 0x00, 0x09, ?1, ?2, ?7, ?., ?0, ?., ?0, ?., ?1]) == {:ok, %{server: "127.0.0.1"}}
+      assert parse([0x80, 0x06, 0x00, 0x09, ?1, ?2, ?7, ?., ?0, ?., ?0, ?., ?1]) == %{server: "127.0.0.1"}
     end
 
     test "handles server record without critical bit" do
-      assert parse([0x00, 0x06, 0x00, 0x09, ?1, ?2, ?7, ?., ?0, ?., ?0, ?., ?1]) == {:ok, %{server: "127.0.0.1"}}
+      assert parse([0x00, 0x06, 0x00, 0x09, ?1, ?2, ?7, ?., ?0, ?., ?0, ?., ?1]) == %{server: "127.0.0.1"}
     end
 
     test "handles port record" do
-      assert parse([0x80, 0x07, 0x00, 0x02, 0x04, 0xCE]) == {:ok, %{port: 1230}}
+      assert parse([0x80, 0x07, 0x00, 0x02, 0x04, 0xCE]) == %{port: 1230}
     end
 
     test "handles port record without critical bit" do
-      assert parse([0x00, 0x07, 0x00, 0x02, 0x04, 0xCE]) == {:ok, %{port: 1230}}
+      assert parse([0x00, 0x07, 0x00, 0x02, 0x04, 0xCE]) == %{port: 1230}
     end
 
     test "handles cookie record" do
-      assert parse([0x80, 0x05, 0x00, 0x0E, ?c, ?h, ?o, ?c, ?o, ?l, ?a, ?t, ?e, ?_, ?c, ?h, ?i, ?p]) ==
-               {:ok, %{cookies: [~c"chocolate_chip"], cookie_length: 14}}
+      assert parse([0x80, 0x05, 0x00, 0x0E, ?c, ?h, ?o, ?c, ?o, ?l, ?a, ?t, ?e, ?_, ?c, ?h, ?i, ?p]) == %{
+               cookies: [~c"chocolate_chip"],
+               cookie_length: 14
+             }
     end
 
     test "handles cookie record without critical bit" do
-      assert parse([0x00, 0x05, 0x00, 0x0E, ?c, ?h, ?o, ?c, ?o, ?l, ?a, ?t, ?e, ?_, ?c, ?h, ?i, ?p]) ==
-               {:ok, %{cookies: [~c"chocolate_chip"], cookie_length: 14}}
+      assert parse([0x00, 0x05, 0x00, 0x0E, ?c, ?h, ?o, ?c, ?o, ?l, ?a, ?t, ?e, ?_, ?c, ?h, ?i, ?p]) == %{
+               cookies: [~c"chocolate_chip"],
+               cookie_length: 14
+             }
     end
 
     test "sets cookie length to longest cookie" do
@@ -102,7 +108,7 @@ defmodule Chronoscope.NTS.KeyEstablishmentResponseTest do
                  [0x80, 0x05, 0x00, 0x03, ?c, ?c, ?c] ++
                  [0x80, 0x05, 0x00, 0x01, ?c]
              ) ==
-               {:ok, %{cookies: [~c"c", ~c"ccc", ~c"c"], cookie_length: 3}}
+               %{cookies: [~c"c", ~c"ccc", ~c"c"], cookie_length: 3}
     end
 
     test "handles full response" do
@@ -115,15 +121,14 @@ defmodule Chronoscope.NTS.KeyEstablishmentResponseTest do
                  [0x80, 0x07, 0x00, 0x02, 0x04, 0xCE] ++
                  [0x80, 0x00, 0x00, 0x00]
              ) ==
-               {:ok,
-                %{
-                  cookies: [~c"c"],
-                  aead_algorithms: ["AEAD_AES_SIV_CMAC_256", "UNKNOWN", "AEAD_AES_128_GCM_SIV"],
-                  cookie_length: 1,
-                  next_protocols: ["NTPv4"],
-                  port: 1230,
-                  server: "127.0.0.1"
-                }}
+               %{
+                 cookies: [~c"c"],
+                 aead_algorithms: ["AEAD_AES_SIV_CMAC_256", "UNKNOWN", "AEAD_AES_128_GCM_SIV"],
+                 cookie_length: 1,
+                 next_protocols: ["NTPv4"],
+                 port: 1230,
+                 server: "127.0.0.1"
+               }
     end
 
     test "doesn't read past end of message record" do
@@ -136,11 +141,10 @@ defmodule Chronoscope.NTS.KeyEstablishmentResponseTest do
                  [0x80, 0x06, 0x00, 0x09, ?1, ?2, ?7, ?., ?0, ?., ?0, ?., ?1] ++
                  [0x80, 0x07, 0x00, 0x02, 0x04, 0xCE]
              ) ==
-               {:ok,
-                %{
-                  aead_algorithms: ["AEAD_AES_128_GCM_SIV"],
-                  next_protocols: ["NTPv4"]
-                }}
+               %{
+                 aead_algorithms: ["AEAD_AES_128_GCM_SIV"],
+                 next_protocols: ["NTPv4"]
+               }
     end
   end
 end