diff --git a/changelog.d/last_status_at.change b/changelog.d/last_status_at.change
new file mode 100644
index 000000000..5417aff30
--- /dev/null
+++ b/changelog.d/last_status_at.change
@@ -0,0 +1 @@
+- Change AccountView `last_status_at` from a datetime to a date (as done in Mastodon 3.1.0)
\ No newline at end of file
diff --git a/lib/pleroma/web/mastodon_api/views/account_view.ex b/lib/pleroma/web/mastodon_api/views/account_view.ex
index cc3e3582f..237de3055 100644
--- a/lib/pleroma/web/mastodon_api/views/account_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/account_view.ex
@@ -1,5 +1,5 @@
 # Pleroma: A lightweight social networking server
-# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2023 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.MastodonAPI.AccountView do
@@ -249,6 +249,10 @@ defp do_render("show.json", %{user: user} = opts) do
         nil
       end
 
+    last_status_at =
+      user.last_status_at &&
+        user.last_status_at |> NaiveDateTime.to_date() |> Date.to_iso8601()
+
     %{
       id: to_string(user.id),
       username: username_from_nickname(user.nickname),
@@ -277,7 +281,7 @@ defp do_render("show.json", %{user: user} = opts) do
           actor_type: user.actor_type
         }
       },
-      last_status_at: user.last_status_at,
+      last_status_at: last_status_at,
 
       # Pleroma extensions
       # Note: it's insecure to output :email but fully-qualified nickname may serve as safe stub
diff --git a/test/pleroma/web/mastodon_api/views/account_view_test.exs b/test/pleroma/web/mastodon_api/views/account_view_test.exs
index 3bb4970ca..d5b8ad8b0 100644
--- a/test/pleroma/web/mastodon_api/views/account_view_test.exs
+++ b/test/pleroma/web/mastodon_api/views/account_view_test.exs
@@ -35,7 +35,8 @@ test "Represent a user account" do
         inserted_at: ~N[2017-08-15 15:47:06.597036],
         emoji: %{"karjalanpiirakka" => "/file.png"},
         raw_bio: "valid html. a\nb\nc\nd\nf '&<>\"",
-        also_known_as: ["https://shitposter.zone/users/shp"]
+        also_known_as: ["https://shitposter.zone/users/shp"],
+        last_status_at: NaiveDateTime.utc_now()
       })
 
     expected = %{
@@ -74,7 +75,7 @@ test "Represent a user account" do
         fields: []
       },
       fqn: "shp@shitposter.club",
-      last_status_at: nil,
+      last_status_at: user.last_status_at |> NaiveDateTime.to_date() |> Date.to_iso8601(),
       pleroma: %{
         ap_id: user.ap_id,
         also_known_as: ["https://shitposter.zone/users/shp"],