Ensure datetime/date are serialized to correct format (#33086)

spec/serializers/rest/account_serializer/field_serializer_spec.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe REST::AccountSerializer::FieldSerializer do
+  subject { serialized_record_json(field, described_class) }
+
+  let(:default_datetime) { DateTime.new(2024, 11, 28, 16, 20, 0) }
+  let(:user)    { Fabricate(:user) }
+  let(:account) { user.account }
+
+  context 'when verified_at is populated' do
+    let(:field) { Account::Field.new(account, 'name' => 'Foo', 'value' => 'Bar', 'verified_at' => default_datetime) }
+
+    it 'parses as RFC 3339 datetime' do
+      expect { DateTime.rfc3339(subject['verified_at']) }.to_not raise_error
+    end
+  end
+end