diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 238f1fbecb..55f08d1fcf 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -732,6 +732,7 @@ desktop/views/components/settings.vue:
   gradient-window-header: "ウィンドウのタイトルバーにグラデーションを使用"
   post-form-on-timeline: "タイムライン上部に投稿フォームを表示する"
   suggest-recent-hashtags: "最近のハッシュタグを投稿フォームに表示する"
+  show-clock-on-header: "右上に時計を表示する"
   show-reply-target: "リプライ先を表示する"
   show-my-renotes: "自分の行ったRenoteをタイムラインに表示する"
   show-renoted-my-notes: "自分の投稿のRenoteをタイムラインに表示する"
diff --git a/src/client/app/desktop/views/components/settings.vue b/src/client/app/desktop/views/components/settings.vue
index df131a1a65..7d6f1d55fb 100644
--- a/src/client/app/desktop/views/components/settings.vue
+++ b/src/client/app/desktop/views/components/settings.vue
@@ -49,6 +49,7 @@
 			</div>
 			<mk-switch v-model="$store.state.settings.showPostFormOnTopOfTl" @change="onChangeShowPostFormOnTopOfTl" text="%i18n:@post-form-on-timeline%"/>
 			<mk-switch v-model="$store.state.settings.suggestRecentHashtags" @change="onChangeSuggestRecentHashtags" text="%i18n:@suggest-recent-hashtags%"/>
+			<mk-switch v-model="$store.state.settings.showClockOnHeader" @change="onChangeShowClockOnHeader" text="%i18n:@show-clock-on-header%"/>
 			<mk-switch v-model="$store.state.settings.showReplyTarget" @change="onChangeShowReplyTarget" text="%i18n:@show-reply-target%"/>
 			<mk-switch v-model="$store.state.settings.showMyRenotes" @change="onChangeShowMyRenotes" text="%i18n:@show-my-renotes%"/>
 			<mk-switch v-model="$store.state.settings.showRenotedMyNotes" @change="onChangeShowRenotedMyNotes" text="%i18n:@show-renoted-my-notes%"/>
@@ -333,6 +334,12 @@ export default Vue.extend({
 				value: v
 			});
 		},
+		onChangeShowClockOnHeader(v) {
+			this.$store.dispatch('settings/set', {
+				key: 'showClockOnHeader',
+				value: v
+			});
+		},
 		onChangeShowReplyTarget(v) {
 			this.$store.dispatch('settings/set', {
 				key: 'showReplyTarget',
diff --git a/src/client/app/desktop/views/components/ui.header.vue b/src/client/app/desktop/views/components/ui.header.vue
index edd9829c1c..6de4eaf744 100644
--- a/src/client/app/desktop/views/components/ui.header.vue
+++ b/src/client/app/desktop/views/components/ui.header.vue
@@ -17,7 +17,7 @@
 					<x-account v-if="$store.getters.isSignedIn"/>
 					<x-notifications v-if="$store.getters.isSignedIn"/>
 					<x-post v-if="$store.getters.isSignedIn"/>
-					<x-clock/>
+					<x-clock v-if="$store.state.settings.showClockOnHeader"/>
 				</div>
 			</div>
 		</div>
diff --git a/src/client/app/store.ts b/src/client/app/store.ts
index ba91a11f25..0f3ff4a380 100644
--- a/src/client/app/store.ts
+++ b/src/client/app/store.ts
@@ -13,6 +13,7 @@ const defaultSettings = {
 	showMaps: true,
 	showPostFormOnTopOfTl: false,
 	suggestRecentHashtags: true,
+	showClockOnHeader: false,
 	circleIcons: true,
 	gradientWindowHeader: false,
 	showReplyTarget: true,