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diff --git a/lib/pleroma/ecto_type/activity_pub/object_validators/date_time.ex b/lib/pleroma/ecto_type/activity_pub/object_validators/date_time.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.EctoType.ActivityPub.ObjectValidators.DateTime do
+  @moduledoc """
+  The AP standard defines the date fields in AP as xsd:DateTime. Elixir's
+  DateTime can't parse this, but it can parse the related iso8601. This
+  module punches the date until it looks like iso8601 and normalizes to
+  it.
+
+  DateTimes without a timezone offset are treated as UTC.
+
+  Reference: https://www.w3.org/TR/activitystreams-vocabulary/#dfn-published
+  """
+  use Ecto.Type
+
+  def type, do: :string
+
+  def cast(datetime) when is_binary(datetime) do
+    with {:ok, datetime, _} <- DateTime.from_iso8601(datetime) do
+      {:ok, DateTime.to_iso8601(datetime)}
+    else
+      {:error, :missing_offset} -> cast("#{datetime}Z")
+      _e -> :error
+    end
+  end
+
+  def cast(_), do: :error
+
+  def dump(data) do
+    {:ok, data}
+  end
+
+  def load(data) do
+    {:ok, data}
+  end
+end