diff --git a/app/controllers/api/v1/statuses_controller.rb b/app/controllers/api/v1/statuses_controller.rb
index 0bfbac33a..cf6ab65b8 100644
--- a/app/controllers/api/v1/statuses_controller.rb
+++ b/app/controllers/api/v1/statuses_controller.rb
@@ -20,6 +20,7 @@ class Api::V1::StatusesController < Api::BaseController
   # conversations as quasi-unlimited, it would be too much work to render more
   # than this anyway
   CONTEXT_LIMIT = 4_096
+  DURATION_RE = /^(?:(?<year>\d+)y)?(?:(?<month>\d+)m(?=[\do])o?)?(?:(?<day>\d+)d)?(?:(?<hour>\d+)h)?(?:(?<minute>\d+)m)?$/
 
   def index
     @statuses = cache_collection(@statuses, Status)
@@ -128,7 +129,18 @@ class Api::V1::StatusesController < Api::BaseController
   end
 
   def set_expire
-    @expires_at = status_params[:expires_at] || (status_params[:expires_in].blank? ? nil : (@scheduled_at || Time.now.utc) + status_params[:expires_in].to_i.seconds)
+    expires_in =
+      if status_params.has_key?(:expires_in)
+        status_params[:expires_in].blank? ? nil : status_params[:expires_in].to_i.seconds
+      elsif (match = current_user.setting_default_expires_in.match(DURATION_RE))
+        year, month, day, hour, minute = match.to_a.values_at(1,2,3,4,5).map(&:to_i)
+        seconds = (year.years + month.months + day.days + hour.hours + minute.minutes).to_i.seconds
+        seconds < 1.minutes ? nil : seconds
+      else
+        nil
+      end
+
+    @expires_at = status_params[:expires_at] || (expires_in.nil? ? nil : (@scheduled_at || Time.now.utc) + expires_in)
   end
 
   def status_ids
diff --git a/app/controllers/settings/preferences_controller.rb b/app/controllers/settings/preferences_controller.rb
index d695afa35..21f3a809f 100644
--- a/app/controllers/settings/preferences_controller.rb
+++ b/app/controllers/settings/preferences_controller.rb
@@ -97,6 +97,8 @@ class Settings::PreferencesController < Settings::BaseController
       :setting_show_reload_button,
       :setting_default_column_width,
       :setting_confirm_domain_block,
+      :setting_default_expires_in,
+      :setting_default_expires_action,
       notification_emails: %i(follow follow_request reblog favourite emoji_reaction status_reference mention digest report pending_account trending_tag),
       interactions: %i(must_be_follower must_be_following must_be_following_dm must_be_dm_to_send_email must_be_following_reference)
     )
diff --git a/app/javascript/mastodon/locales/ja.json b/app/javascript/mastodon/locales/ja.json
index 9be27ad5a..a1a9ddb1d 100644
--- a/app/javascript/mastodon/locales/ja.json
+++ b/app/javascript/mastodon/locales/ja.json
@@ -213,7 +213,7 @@
   "datetime_button.add_datetime": "日時を追加",
   "datetime_button.remove_datetime": "日時を削除",
   "datetime.expires": "終了日時",
-  "datetime.expires_action.mark": "保持",
+  "datetime.expires_action.mark": "期限切れマーク",
   "datetime.expires_action.delete": "削除",
   "datetime.open_calendar": "カレンダーを開く",
   "datetime.placeholder": "日付か期間を入力",
diff --git a/app/javascript/mastodon/reducers/compose.js b/app/javascript/mastodon/reducers/compose.js
index eecc1b333..129ae1281 100644
--- a/app/javascript/mastodon/reducers/compose.js
+++ b/app/javascript/mastodon/reducers/compose.js
@@ -160,10 +160,10 @@ const clearAll = state => {
     map.update('media_attachments', list => list.clear());
     map.set('poll', null);
     map.set('idempotencyKey', uuid());
-    map.set('datetime_form', null);
+    map.set('datetime_form', state.get('default_expires_in') ? true : null);
     map.set('scheduled', null);
-    map.set('expires', null);
-    map.set('expires_action', 'mark');
+    map.set('expires', state.get('default_expires_in', null));
+    map.set('expires_action', state.get('default_expires_action', 'mark'));
     map.update('references', set => set.clear());
     map.update('context_references', set => set.clear());
 });
@@ -410,10 +410,10 @@ export default function compose(state = initialState, action) {
       map.set('caretPosition', null);
       map.set('preselectDate', new Date());
       map.set('idempotencyKey', uuid());
-      map.set('datetime_form', null);
+      map.set('datetime_form', state.get('default_expires_in') ? true : null);
       map.set('scheduled', null);
-      map.set('expires', null);
-      map.set('expires_action', 'mark');
+      map.set('expires', state.get('default_expires_in', null));
+      map.set('expires_action', state.get('default_expires_action', 'mark'));
       map.update('context_references', set => set.clear().concat(action.context_references));
 
       if (action.status.get('spoiler_text').length > 0) {
@@ -438,10 +438,10 @@ export default function compose(state = initialState, action) {
       map.set('focusDate', new Date());
       map.set('preselectDate', new Date());
       map.set('idempotencyKey', uuid());
-      map.set('datetime_form', null);
+      map.set('datetime_form', state.get('default_expires_in') ? true : null);
       map.set('scheduled', null);
-      map.set('expires', null);
-      map.set('expires_action', 'mark');
+      map.set('expires', state.get('default_expires_in', null));
+      map.set('expires_action', state.get('default_expires_action', 'mark'));
       map.update('context_references', set => set.clear().add(action.status.get('id')));
 
       if (action.status.get('spoiler_text').length > 0) {
@@ -468,10 +468,10 @@ export default function compose(state = initialState, action) {
       map.set('circle_id', null);
       map.set('poll', null);
       map.set('idempotencyKey', uuid());
-      map.set('datetime_form', null);
+      map.set('datetime_form', state.get('default_expires_in') ? true : null);
       map.set('scheduled', null);
-      map.set('expires', null);
-      map.set('expires_action', 'mark');
+      map.set('expires', state.get('default_expires_in', null));
+      map.set('expires_action', state.get('default_expires_action', 'mark'));
       map.update('context_references', set => set.clear());
       if (action.type == COMPOSE_RESET) {
         map.update('references', set => set.clear());
@@ -575,6 +575,8 @@ export default function compose(state = initialState, action) {
       }));
   case REDRAFT:
     return state.withMutations(map => {
+      const default_expires_in_exist = state.get('default_expires_in') ? true : null;
+
       map.set('text', action.raw_text || unescapeHTML(rejectQuoteAltText(expandMentions(action.status))));
       map.set('in_reply_to', action.status.get('in_reply_to_id'));
       map.set('quote_from', action.status.getIn(['quote', 'id']));
@@ -588,10 +590,10 @@ export default function compose(state = initialState, action) {
       map.set('caretPosition', null);
       map.set('idempotencyKey', uuid());
       map.set('sensitive', action.status.get('sensitive'));
-      map.set('datetime_form', !!action.status.get('scheduled_at') || !!action.status.get('expires_at') ? true : null);
+      map.set('datetime_form', !!action.status.get('scheduled_at') || !!action.status.get('expires_at') ? true : default_expires_in_exist);
       map.set('scheduled', action.status.get('scheduled_at'));
-      map.set('expires', action.status.get('expires_at') ? format(parseISO(action.status.get('expires_at')), 'yyyy-MM-dd HH:mm') : null);
-      map.set('expires_action', action.status.get('expires_action') ?? 'mark');
+      map.set('expires', action.status.get('expires_at') ? format(parseISO(action.status.get('expires_at')), 'yyyy-MM-dd HH:mm') : state.get('default_expires_in', null));
+      map.set('expires_action', action.status.get('expires_action') ?? state.get('default_expires_action', 'mark'));
       map.update('references', set => set.clear().concat(action.status.get('status_reference_ids')));
       map.update('context_references', set => set.clear().concat(action.context_references));
 
diff --git a/app/lib/user_settings_decorator.rb b/app/lib/user_settings_decorator.rb
index 4d8092107..fefc932a5 100644
--- a/app/lib/user_settings_decorator.rb
+++ b/app/lib/user_settings_decorator.rb
@@ -91,7 +91,9 @@ class UserSettingsDecorator
     user.settings['default_search_searchability']      = default_search_searchability_preference if change?('setting_default_search_searchability')
     user.settings['show_reload_button']                = show_reload_button_preference if change?('setting_show_reload_button')
     user.settings['default_column_width']              = default_column_width_preference if change?('setting_default_column_width')
-  end
+    user.settings['default_expires_in']                = default_expires_in_preference if change?('setting_default_expires_in')
+    user.settings['default_expires_action']            = default_expires_action_preference if change?('setting_default_expires_action')
+end
 
   def merged_notification_emails
     user.settings['notification_emails'].merge coerced_settings('notification_emails').to_h
@@ -341,6 +343,14 @@ class UserSettingsDecorator
     settings['setting_default_column_width']
   end
 
+  def default_expires_in_preference
+    settings['setting_default_expires_in']
+  end
+
+  def default_expires_action_preference
+    settings['setting_default_expires_action']
+  end
+
   def boolean_cast_setting(key)
     ActiveModel::Type::Boolean.new.cast(settings[key])
   end
diff --git a/app/models/user.rb b/app/models/user.rb
index 8d10a4265..9b8b7babb 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -141,7 +141,7 @@ class User < ApplicationRecord
            :multi_column_customize, :multi_column_content_font_size, :multi_column_info_font_size, :multi_column_content_emoji_reaction_size,
            :mobile_customize, :mobile_content_font_size, :mobile_info_font_size, :mobile_content_emoji_reaction_size,
            :hide_bot_on_public_timeline, :confirm_follow_from_bot,
-           :default_search_searchability,
+           :default_search_searchability, :default_expires_in, :default_expires_action,
            :show_reload_button, :default_column_width,
 
            to: :settings, prefix: :setting, allow_nil: false
diff --git a/app/serializers/initial_state_serializer.rb b/app/serializers/initial_state_serializer.rb
index e53343e23..cc0052290 100644
--- a/app/serializers/initial_state_serializer.rb
+++ b/app/serializers/initial_state_serializer.rb
@@ -89,10 +89,12 @@ class InitialStateSerializer < ActiveModel::Serializer
     store = {}
 
     if object.current_account
-      store[:me]                    = object.current_account.id.to_s
-      store[:default_privacy]       = object.visibility || object.current_account.user.setting_default_privacy
-      store[:default_searchability] = object.current_account.searchability
-      store[:default_sensitive]     = object.current_account.user.setting_default_sensitive
+      store[:me]                     = object.current_account.id.to_s
+      store[:default_privacy]        = object.visibility || object.current_account.user.setting_default_privacy
+      store[:default_searchability]  = object.current_account.searchability
+      store[:default_sensitive]      = object.current_account.user.setting_default_sensitive
+      store[:default_expires_in]     = object.current_account.user.setting_default_expires_in
+      store[:default_expires_action] = object.current_account.user.setting_default_expires_action
     end
 
     store[:text] = object.text if object.text
diff --git a/app/views/settings/preferences/other/show.html.haml b/app/views/settings/preferences/other/show.html.haml
index 373979545..38fa01a73 100644
--- a/app/views/settings/preferences/other/show.html.haml
+++ b/app/views/settings/preferences/other/show.html.haml
@@ -40,6 +40,14 @@
   .fields-group
     = f.input :setting_show_application, as: :boolean, wrapper: :with_label, recommended: true
 
+  .fields-row
+    .fields-group.fields-row__column.fields-row__column-6
+      = f.input :setting_default_expires_in, wrapper: :with_label, input_html: { maxlength: 30, pattern: '^(?:(\d+)y)?(?:(\d+)m(?=[\do])o?)?(?:(\d+)d)?(?:(\d+)h)?(?:(\d+)m)?$' }, fedibird_features: true
+
+    .fields-group.fields-row__column.fields-row__column-6
+      %span.fedibird_features.float Fedibird
+      = f.input :setting_default_expires_action, collection: ['mark', 'delete'], label_method: lambda { |item| t("simple_form.labels.defaults.setting_default_expires_action_#{item}") }, hint: t("simple_form.hints.defaults.setting_default_expires_action"), as: :radio_buttons, collection_wrapper_tag: 'ul', item_wrapper_tag: 'li', wrapper: :with_floating_label
+
   %h4= t 'preferences.searching_defaults'
 
   .fields-group
diff --git a/config/locales/simple_form.en.yml b/config/locales/simple_form.en.yml
index 5df9c8169..8d87ceaa6 100644
--- a/config/locales/simple_form.en.yml
+++ b/config/locales/simple_form.en.yml
@@ -62,6 +62,12 @@ en:
         setting_default_column_width_x100: 100% - Fix to Mastodon standard column width
         setting_default_column_width_x125: 125% - Fix to 125% of standard width
         setting_default_column_width_x150: 150% - Fix to 150% of standard width
+        setting_default_expires_action: |
+          Submissions whose publication period has ended will be marked or deleted.
+          Marked posts will no longer be visible, but only the poster and those who reacted (favourite, emoji reaction, bookmark) to the post will be able to see it.
+        setting_default_expires_in: |
+          Specify the end date and time as the starting point of the posting date and time.
+          The format is 1y2mo3d4h5m (1 year, 2 months, 3 days, 4 hours, 5 minutes later).
         setting_default_search_searchability: For clients that do not support advanced range settings, switch the settings here. Mastodon's standard behavior is "Reacted-users-only". Targeting "Public" makes it easier to discover unknown information, but if the results are noisy, narrowing the search range is effective.
         setting_default_sensitive: Sensitive media is hidden by default and can be revealed with a click
         setting_disable_joke_appearance: Disable April Fools' Day and other joke functions
@@ -226,6 +232,10 @@ en:
         setting_content_font_size: Content font size
         setting_crop_images: Crop images in non-expanded posts to 16x9
         setting_default_column_width: Default column width
+        setting_default_expires_action: Default expiry action
+        setting_default_expires_action_mark: Mark as expired
+        setting_default_expires_action_delete: Delete
+        setting_default_expires_in: Default expiry duration
         setting_default_language: Posting language
         setting_default_privacy: Posting privacy
         setting_default_search_searchability: Search range
diff --git a/config/locales/simple_form.ja.yml b/config/locales/simple_form.ja.yml
index 2669207fc..0b63f7ae7 100644
--- a/config/locales/simple_form.ja.yml
+++ b/config/locales/simple_form.ja.yml
@@ -62,6 +62,8 @@ ja:
         setting_default_column_width_x100: 100% - Mastodon標準のカラム幅に固定します
         setting_default_column_width_x125: 125% - 標準の125%の幅に固定します
         setting_default_column_width_x150: 150% - 標準の150%の幅に固定します
+        setting_default_expires_action: 公開期間が終了した投稿には、マークが付けられるか、削除されます。マークされた投稿は見えなくなり、投稿者とその投稿に反応（お気に入り・絵文字リアクション・ブックマーク）した人だけが見ることができるようになります。
+        setting_default_expires_in: 投稿日時を起点とする終了日時を指定します。書式は1y2mo3d4h5m（1年2ヶ月3日4時間5分後）です。
         setting_default_search_searchability: 範囲の詳細設定に対応していないクライアントでは、ここで設定を切り替えてください。Mastodonの標準動作は『リアクション限定』です。『公開』を対象にすると未知の情報を発見しやすくなりますが、結果にノイズが多い場合は検索範囲を狭めると効果的です。
         setting_default_sensitive: 閲覧注意状態のメディアはデフォルトでは内容が伏せられ、クリックして初めて閲覧できるようになります
         setting_disable_joke_appearance: エイプリルフール等のジョーク機能を無効にします
@@ -226,6 +228,10 @@ ja:
         setting_content_font_size: 投稿のフォントサイズ
         setting_crop_images: 投稿の詳細以外では画像を16:9に切り抜く
         setting_default_column_width: デフォルトのカラム幅
+        setting_default_expires_action: デフォルトの終了時アクション
+        setting_default_expires_action_mark: 期限切れマーク
+        setting_default_expires_action_delete: 削除
+        setting_default_expires_in: デフォルトの終了日時
         setting_default_language: 投稿する言語
         setting_default_privacy: 投稿の公開範囲
         setting_default_search_searchability: 検索の対象とする範囲
diff --git a/config/settings.yml b/config/settings.yml
index e8b1061b4..ea8b1b365 100644
--- a/config/settings.yml
+++ b/config/settings.yml
@@ -112,6 +112,8 @@ defaults: &defaults
   default_search_searchability: 'private'
   show_reload_button: true
   default_column_width: 'x100'
+  default_expires_in: ''
+  default_expires_action: 'mark'
 
 development:
   <<: *defaults