diff --git a/lib/pleroma/announcement.ex b/lib/pleroma/announcement.ex
index b0e787fe0..b3c88b441 100644
--- a/lib/pleroma/announcement.ex
+++ b/lib/pleroma/announcement.ex
@@ -6,6 +6,7 @@ defmodule Pleroma.Announcement do
   use Ecto.Schema
 
   import Ecto.Changeset, only: [cast: 3, validate_required: 2]
+  import Ecto.Query
 
   alias Pleroma.AnnouncementReadRelationship
   alias Pleroma.Repo
@@ -15,16 +16,36 @@ defmodule Pleroma.Announcement do
 
   schema "announcements" do
     field(:data, :map)
+    field(:starts_at, :naive_datetime)
+    field(:ends_at, :naive_datetime)
 
     timestamps()
   end
 
   def change(struct, params \\ %{}) do
     struct
+    |> validate_params()
     |> cast(params, [:data])
     |> validate_required([:data])
   end
 
+  defp validate_params(params) do
+    base_struct = %{
+      "content" => "",
+      "all_day" => false
+    }
+
+    merged_data =
+      Map.merge(base_struct, params.data)
+      |> Map.take(["content", "all_day"])
+
+    %{
+      data: merged_data,
+      starts_at: Map.get(params, "starts_at"),
+      ends_at: Map.get(params, "ends_at")
+    }
+  end
+
   def add(params) do
     changeset = change(%__MODULE__{}, params)
 
@@ -86,4 +107,17 @@ defmodule Pleroma.Announcement do
     base
     |> Map.merge(extra_params)
   end
+
+  # "visible" means:
+  # starts_at < time < ends_at
+  def list_all_visible_when(time) do
+    __MODULE__
+    |> where([a], is_nil(a.starts_at) or a.starts_at < ^time)
+    |> where([a], is_nil(a.ends_at) or a.ends_at > ^time)
+    |> Repo.all()
+  end
+
+  def list_all_visible do
+    list_all_visible_when(NaiveDateTime.utc_now())
+  end
 end
diff --git a/priv/repo/migrations/20220308012601_create_announcements.exs b/priv/repo/migrations/20220308012601_create_announcements.exs
index e7c3b10a3..9f273fda9 100644
--- a/priv/repo/migrations/20220308012601_create_announcements.exs
+++ b/priv/repo/migrations/20220308012601_create_announcements.exs
@@ -5,6 +5,8 @@ defmodule Pleroma.Repo.Migrations.CreateAnnouncements do
     create_if_not_exists table(:announcements, primary_key: false) do
       add(:id, :uuid, primary_key: true)
       add(:data, :map)
+      add(:starts_at, :naive_datetime)
+      add(:ends_at, :naive_datetime)
 
       timestamps()
     end
diff --git a/test/pleroma/announcement_test.exs b/test/pleroma/announcement_test.exs
new file mode 100644
index 000000000..aa00f804b
--- /dev/null
+++ b/test/pleroma/announcement_test.exs
@@ -0,0 +1,71 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.AnnouncementTest do
+  alias Pleroma.Announcement
+
+  use Pleroma.DataCase, async: true
+
+  import Pleroma.Factory
+
+  describe "list_all_visible_when/1" do
+    setup do: {:ok, time: NaiveDateTime.utc_now()}
+
+    test "with no start or end time", %{time: time} do
+      _announcement = insert(:announcement)
+
+      assert [_] = Announcement.list_all_visible_when(time)
+    end
+
+    test "with start time before current", %{time: time} do
+      before_now = NaiveDateTime.add(time, -10, :second)
+
+      _announcement = insert(:announcement, %{starts_at: before_now})
+
+      assert [_] = Announcement.list_all_visible_when(time)
+    end
+
+    test "with start time after current", %{time: time} do
+      after_now = NaiveDateTime.add(time, 10, :second)
+
+      _announcement = insert(:announcement, %{starts_at: after_now})
+
+      assert [] = Announcement.list_all_visible_when(time)
+    end
+
+    test "with end time after current", %{time: time} do
+      after_now = NaiveDateTime.add(time, 10, :second)
+
+      _announcement = insert(:announcement, %{ends_at: after_now})
+
+      assert [_] = Announcement.list_all_visible_when(time)
+    end
+
+    test "with end time before current", %{time: time} do
+      before_now = NaiveDateTime.add(time, -10, :second)
+
+      _announcement = insert(:announcement, %{ends_at: before_now})
+
+      assert [] = Announcement.list_all_visible_when(time)
+    end
+
+    test "with both start and end time", %{time: time} do
+      before_now = NaiveDateTime.add(time, -10, :second)
+      after_now = NaiveDateTime.add(time, 10, :second)
+
+      _announcement = insert(:announcement, %{starts_at: before_now, ends_at: after_now})
+
+      assert [_] = Announcement.list_all_visible_when(time)
+    end
+
+    test "with both start and end time, current not in the range", %{time: time} do
+      before_now = NaiveDateTime.add(time, -10, :second)
+      after_now = NaiveDateTime.add(time, 10, :second)
+
+      _announcement = insert(:announcement, %{starts_at: after_now, ends_at: before_now})
+
+      assert [] = Announcement.list_all_visible_when(time)
+    end
+  end
+end
diff --git a/test/support/factory.ex b/test/support/factory.ex
index 85ea49cb2..620102bbb 100644
--- a/test/support/factory.ex
+++ b/test/support/factory.ex
@@ -628,11 +628,10 @@ defmodule Pleroma.Factory do
     }
   end
 
-  def announcement_factory do
+  def announcement_factory(params \\ %{}, data \\ %{}) do
     %Pleroma.Announcement{
-      data: %{
-        "content" => "test announcement"
-      }
+      data: Map.merge(%{"content" => "test announcement"}, data)
     }
+    |> Map.merge(params)
   end
 end