diff --git a/CHANGELOG.md b/CHANGELOG.md
index 34860f6ef3..c2d0cc4e73 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,8 @@
 - Enhance: プッシュ通知を行うための権限確認をより確実に行うように
 - Enhance: 投稿フォームのチュートリアルを追加
 - Enhance: 「自動でもっと見る」をほとんどの箇所で利用可能に
+- Enhance: ミュートの付与期間を自由に設定できるように
+- Enhance: ロールの付与期間を自由に設定できるように
 - Fix: 紙吹雪エフェクトがアニメーション設定を考慮せず常に表示される問題を修正
 - Fix: ナビゲーションバーのリアルタイムモード切替ボタンの状態をよりわかりやすく表示するように
 - Fix: ページのタイトルが長いとき、はみ出る問題を修正
diff --git a/locales/index.d.ts b/locales/index.d.ts
index 1f6a79699e..652902e51d 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -3846,6 +3846,10 @@ export interface Locale extends ILocale {
      * ミュートする期限
      */
     "mutePeriod": string;
+    /**
+     * 期限はあくまで目安です。反映が数分遅れる場合があります。
+     */
+    "mutePeriodDescription": string;
     /**
      * 期限
      */
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 28b7fa2474..14eb74fb2e 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -957,6 +957,7 @@ instanceDefaultLightTheme: "サーバーデフォルトのライトテーマ"
 instanceDefaultDarkTheme: "サーバーデフォルトのダークテーマ"
 instanceDefaultThemeDescription: "オブジェクト形式のテーマコードを記入します。"
 mutePeriod: "ミュートする期限"
+mutePeriodDescription: "期限はあくまで目安です。反映が数分遅れる場合があります。"
 period: "期限"
 indefinitely: "無期限"
 tenMinutes: "10分"
diff --git a/packages/frontend/src/components/MkMuteSettingDialog.vue b/packages/frontend/src/components/MkMuteSettingDialog.vue
index 22dcff7c25..fba13c16e7 100644
--- a/packages/frontend/src/components/MkMuteSettingDialog.vue
+++ b/packages/frontend/src/components/MkMuteSettingDialog.vue
@@ -15,17 +15,27 @@ SPDX-License-Identifier: AGPL-3.0-only
 			</div>
 		</div>
 		<div class="_gaps">
-			<MkSelect v-model="periodModel" :items="periodDef">
-				<template #label>{{ i18n.ts.mutePeriod }}</template>
-			</MkSelect>
-			<MkSelect v-model="muteTypeModel" :items="muteTypeDef">
+			<FormSlot>
+				<div class="_gaps_s">
+					<MkSelect v-model="periodModel" :items="periodDef">
+						<template #label>{{ i18n.ts.mutePeriod }}</template>
+					</MkSelect>
+					<MkInput
+						v-if="periodModel === 'custom'"
+						v-model="manualExpiresAt"
+						type="datetime-local"
+					></MkInput>
+				</div>
+				<template #caption>{{ i18n.ts.mutePeriodDescription }}</template>
+			</FormSlot>
+			<MkSelect v-if="withMuteType" v-model="muteTypeModel" :items="muteTypeDef">
 				<template #label>{{ i18n.ts.muteType }}</template>
 				<template #caption>{{ i18n.ts.muteTypeDescription }}</template>
 			</MkSelect>
 		</div>
 		<div :class="$style.buttons">
 			<MkButton inline rounded @click="cancel">{{ i18n.ts.cancel }}</MkButton>
-			<MkButton inline primary rounded @click="ok">{{ i18n.ts.ok }}</MkButton>
+			<MkButton inline primary rounded :disabled="!canSave" @click="ok">{{ i18n.ts.ok }}</MkButton>
 		</div>
 	</div>
 </MkModal>
@@ -34,6 +44,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts">
 import { i18n } from '@/i18n.js';
 import type { MkSelectItem, GetMkSelectValueTypesFromDef } from '@/components/MkSelect.vue';
+import MkInput from './MkInput.vue';
 
 const periodItems = [{
 	value: 'indefinitely', label: i18n.ts.indefinitely,
@@ -45,6 +56,8 @@ const periodItems = [{
 	value: 'oneDay', label: i18n.ts.oneDay,
 }, {
 	value: 'oneWeek', label: i18n.ts.oneWeek,
+}, {
+	value: 'custom', label: i18n.ts.custom,
 }] as const satisfies MkSelectItem[];
 
 const muteTypeItems = [{
@@ -53,22 +66,29 @@ const muteTypeItems = [{
 	value: 'timelineOnly', label: i18n.ts.muteTypeTimeline,
 }] as const satisfies MkSelectItem[];
 
-export type MkMuteSettingDialogDoneEvent = { canceled: true } | { canceled: false, period: GetMkSelectValueTypesFromDef<typeof periodItems>, type: GetMkSelectValueTypesFromDef<typeof muteTypeItems> };
+export type MkMuteSettingDialogDoneEvent = { canceled: true } | { canceled: false, expiresAt: number | null, type: GetMkSelectValueTypesFromDef<typeof muteTypeItems> };
 </script>
 
 <script lang="ts" setup>
-import { onBeforeUnmount, onMounted, shallowRef } from 'vue';
+import { onBeforeUnmount, onMounted, useTemplateRef, ref, computed } from 'vue';
+import FormSlot from '@/components/form/slot.vue';
 import MkModal from '@/components/MkModal.vue';
 import MkButton from '@/components/MkButton.vue';
 import MkSelect from '@/components/MkSelect.vue';
 import { useMkSelect } from '@/composables/use-mkselect.js';
 
+withDefaults(defineProps<{
+	withMuteType?: boolean;
+}>(), {
+	withMuteType: false,
+});
+
 const emit = defineEmits<{
 	(ev: 'done', v: MkMuteSettingDialogDoneEvent): void;
 	(ev: 'closed'): void;
 }>();
 
-const modal = shallowRef<InstanceType<typeof MkModal>>();
+const modal = useTemplateRef('modal');
 
 const {
 	def: periodDef,
@@ -78,6 +98,15 @@ const {
 	initialValue: 'indefinitely',
 });
 
+const now = Date.now();
+const manualExpiresAt = ref<string | null>(null);
+const canSave = computed(() => {
+	if (periodModel.value === 'custom') {
+		return manualExpiresAt.value != null && new Date(manualExpiresAt.value).getTime() > now;
+	}
+	return true;
+});
+
 const {
 	def: muteTypeDef,
 	model: muteTypeModel,
@@ -91,7 +120,36 @@ function done(canceled: true): void;
 function done(canceled: false, period: typeof periodModel.value, type: typeof muteTypeModel.value): void; // eslint-disable-line no-redeclare
 
 function done(canceled: boolean, period?: typeof periodModel.value, type?: typeof muteTypeModel.value) { // eslint-disable-line no-redeclare
-	emit('done', { canceled, period: period!, type: type! });
+	const expiresAt = (() => {
+		if (canceled) return null;
+		if (period === 'custom' && manualExpiresAt.value != null) {
+			return new Date(manualExpiresAt.value!).getTime();
+		}
+
+		const now = Date.now();
+
+		switch (period) {
+			case 'indefinitely':
+				return null;
+			case 'tenMinutes':
+				return now + 10 * 60 * 1000;
+			case 'oneHour':
+				return now + 60 * 60 * 1000;
+			case 'oneDay':
+				return now + 24 * 60 * 60 * 1000;
+			case 'oneWeek':
+				return now + 7 * 24 * 60 * 60 * 1000;
+			default:
+				return null;
+		}
+	})();
+
+	if (canceled) {
+		emit('done', { canceled: true });
+	} else {
+		emit('done', { canceled: false, expiresAt, type: type! });
+	}
+
 	modal.value?.close();
 }
 
diff --git a/packages/frontend/src/components/MkPeriodDialog.vue b/packages/frontend/src/components/MkPeriodDialog.vue
new file mode 100644
index 0000000000..c27c3b7b0b
--- /dev/null
+++ b/packages/frontend/src/components/MkPeriodDialog.vue
@@ -0,0 +1,187 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<MkModal ref="modal" :preferType="'dialog'" :zPriority="'high'" @click="done(true)" @closed="emit('closed')">
+	<div :class="$style.root">
+		<div v-if="title" class="_selectable" :class="$style.header">
+			<Mfm :text="title"/>
+		</div>
+		<div v-if="text" :class="$style.text" class="_selectable">
+			<Mfm :text="text"/>
+		</div>
+		<div class="_gaps_s">
+			<MkSelect v-model="periodModel" :items="periodDef"></MkSelect>
+			<MkInput
+				v-if="periodModel === 'custom'"
+				v-model="manualExpiresAt"
+				type="datetime-local"
+			></MkInput>
+		</div>
+		<div :class="$style.buttons">
+			<MkButton inline rounded @click="cancel">{{ i18n.ts.cancel }}</MkButton>
+			<MkButton inline primary rounded :disabled="!canSave" @click="ok">{{ i18n.ts.ok }}</MkButton>
+		</div>
+	</div>
+</MkModal>
+</template>
+
+<script lang="ts">
+import { i18n } from '@/i18n.js';
+import type { MkSelectItem } from '@/components/MkSelect.vue';
+import MkInput from './MkInput.vue';
+
+const periodItems = [{
+	value: 'indefinitely', label: i18n.ts.indefinitely,
+}, {
+	value: 'tenMinutes', label: i18n.ts.tenMinutes,
+}, {
+	value: 'oneHour', label: i18n.ts.oneHour,
+}, {
+	value: 'oneDay', label: i18n.ts.oneDay,
+}, {
+	value: 'oneWeek', label: i18n.ts.oneWeek,
+}, {
+	value: 'custom', label: i18n.ts.custom,
+}] as const satisfies MkSelectItem[];
+
+export type MkPeriodDialogDoneEvent = { canceled: true } | { canceled: false, expiresAt: number | null };
+</script>
+
+<script lang="ts" setup>
+import { onBeforeUnmount, onMounted, useTemplateRef, ref, computed } from 'vue';
+import MkModal from '@/components/MkModal.vue';
+import MkButton from '@/components/MkButton.vue';
+import MkSelect from '@/components/MkSelect.vue';
+import { useMkSelect } from '@/composables/use-mkselect.js';
+
+defineProps<{
+	title?: string;
+	text?: string;
+}>();
+
+const emit = defineEmits<{
+	(ev: 'done', v: MkPeriodDialogDoneEvent): void;
+	(ev: 'closed'): void;
+}>();
+
+const modal = useTemplateRef('modal');
+
+const {
+	def: periodDef,
+	model: periodModel,
+} = useMkSelect({
+	items: periodItems,
+	initialValue: 'indefinitely',
+});
+
+const now = Date.now();
+const manualExpiresAt = ref<string | null>(null);
+const canSave = computed(() => {
+	if (periodModel.value === 'custom') {
+		return manualExpiresAt.value != null && new Date(manualExpiresAt.value).getTime() > now;
+	}
+	return true;
+});
+
+// overload function を使いたいので lint エラーを無視する
+function done(canceled: true): void;
+function done(canceled: false, period: typeof periodModel.value): void; // eslint-disable-line no-redeclare
+
+function done(canceled: boolean, period?: typeof periodModel.value) { // eslint-disable-line no-redeclare
+	const expiresAt = (() => {
+		if (canceled) return null;
+		if (period === 'custom' && manualExpiresAt.value != null) {
+			return new Date(manualExpiresAt.value!).getTime();
+		}
+
+		const now = Date.now();
+
+		switch (period) {
+			case 'indefinitely':
+				return null;
+			case 'tenMinutes':
+				return now + 10 * 60 * 1000;
+			case 'oneHour':
+				return now + 60 * 60 * 1000;
+			case 'oneDay':
+				return now + 24 * 60 * 60 * 1000;
+			case 'oneWeek':
+				return now + 7 * 24 * 60 * 60 * 1000;
+			default:
+				return null;
+		}
+	})();
+
+	if (canceled) {
+		emit('done', { canceled: true });
+	} else {
+		emit('done', { canceled: false, expiresAt });
+	}
+
+	modal.value?.close();
+}
+
+async function ok() {
+	done(false, periodModel.value);
+}
+
+function cancel() {
+	done(true);
+}
+
+/*
+function onBgClick() {
+	if (props.cancelableByBgClick) cancel();
+}
+*/
+function onKeydown(evt: KeyboardEvent) {
+	if (evt.key === 'Escape') cancel();
+}
+
+onMounted(() => {
+	window.document.addEventListener('keydown', onKeydown);
+});
+
+onBeforeUnmount(() => {
+	window.document.removeEventListener('keydown', onKeydown);
+});
+</script>
+
+<style lang="scss" module>
+.root {
+	position: relative;
+	margin: auto;
+	padding: 32px;
+	min-width: 320px;
+	max-width: 480px;
+	box-sizing: border-box;
+	background: var(--MI_THEME-panel);
+	border-radius: 16px;
+}
+
+.header {
+	margin: 0 0 8px 0;
+	text-align: center;
+	font-weight: bold;
+	font-size: 1.1em;
+
+	& + .text {
+		margin-top: 8px;
+	}
+}
+
+.text {
+	margin: 16px 0 0 0;
+}
+
+.buttons {
+	margin-top: 16px;
+	display: flex;
+	gap: 8px;
+	flex-wrap: wrap;
+	justify-content: center;
+}
+</style>
diff --git a/packages/frontend/src/os.ts b/packages/frontend/src/os.ts
index aafa1c4b21..d53904865f 100644
--- a/packages/frontend/src/os.ts
+++ b/packages/frontend/src/os.ts
@@ -15,6 +15,7 @@ import type { MenuItem } from '@/types/menu.js';
 import type { PostFormProps } from '@/types/post-form.js';
 import type { UploaderFeatures } from '@/composables/use-uploader.js';
 import type { MkSelectItem, OptionValue } from '@/components/MkSelect.vue';
+import type { MkPeriodDialogDoneEvent } from '@/components/MkPeriodDialog.vue';
 import type MkRoleSelectDialog_TypeReferenceOnly from '@/components/MkRoleSelectDialog.vue';
 import type MkEmojiPickerDialog_TypeReferenceOnly from '@/components/MkEmojiPickerDialog.vue';
 import { misskeyApi } from '@/utility/misskey-api.js';
@@ -530,6 +531,19 @@ export function select<C extends OptionValue, D extends C | null = null>(props:
 	});
 }
 
+export function selectPeriod(options: { title?: string } = {}): Promise<MkPeriodDialogDoneEvent> {
+	return new Promise(async (resolve) => {
+		const { dispose } = popup(defineAsyncComponent(() => import('@/components/MkPeriodDialog.vue')), {
+			title: options.title,
+		}, {
+			done: result => {
+				resolve(result ? result : { canceled: true });
+			},
+			closed: () => dispose(),
+		});
+	});
+}
+
 export function success(): Promise<void> {
 	return new Promise(resolve => {
 		const showing = ref(true);
diff --git a/packages/frontend/src/pages/admin-user.vue b/packages/frontend/src/pages/admin-user.vue
index 6d3cc9c1b7..a72d683abe 100644
--- a/packages/frontend/src/pages/admin-user.vue
+++ b/packages/frontend/src/pages/admin-user.vue
@@ -447,31 +447,13 @@ async function assignRole() {
 	});
 	if (canceled || roleId == null) return;
 
-	const { canceled: canceled2, result: period } = await os.select({
-		title: i18n.ts.period + ': ' + roles.find(r => r.id === roleId)!.name,
-		items: [{
-			value: 'indefinitely', label: i18n.ts.indefinitely,
-		}, {
-			value: 'oneHour', label: i18n.ts.oneHour,
-		}, {
-			value: 'oneDay', label: i18n.ts.oneDay,
-		}, {
-			value: 'oneWeek', label: i18n.ts.oneWeek,
-		}, {
-			value: 'oneMonth', label: i18n.ts.oneMonth,
-		}],
-		default: 'indefinitely',
+	const res = await os.selectPeriod({
+		title: `${i18n.ts.period}: ${roles.find(r => r.id === roleId)!.name}`,
 	});
-	if (canceled2) return;
 
-	const expiresAt = period === 'indefinitely' ? null
-		: period === 'oneHour' ? Date.now() + (1000 * 60 * 60)
-		: period === 'oneDay' ? Date.now() + (1000 * 60 * 60 * 24)
-		: period === 'oneWeek' ? Date.now() + (1000 * 60 * 60 * 24 * 7)
-		: period === 'oneMonth' ? Date.now() + (1000 * 60 * 60 * 24 * 30)
-		: null;
+	if (res.canceled) return;
 
-	await os.apiWithDialog('admin/roles/assign', { roleId, userId: user.value.id, expiresAt });
+	await os.apiWithDialog('admin/roles/assign', { roleId, userId: user.value.id, expiresAt: res.expiresAt });
 	refreshUser();
 }
 
diff --git a/packages/frontend/src/pages/admin/roles.role.vue b/packages/frontend/src/pages/admin/roles.role.vue
index 2e249eee50..1a2c365669 100644
--- a/packages/frontend/src/pages/admin/roles.role.vue
+++ b/packages/frontend/src/pages/admin/roles.role.vue
@@ -112,31 +112,12 @@ async function del() {
 async function assign() {
 	const user = await os.selectUser({ includeSelf: true });
 
-	const { canceled: canceled2, result: period } = await os.select({
-		title: i18n.ts.period + ': ' + role.name,
-		items: [{
-			value: 'indefinitely', label: i18n.ts.indefinitely,
-		}, {
-			value: 'oneHour', label: i18n.ts.oneHour,
-		}, {
-			value: 'oneDay', label: i18n.ts.oneDay,
-		}, {
-			value: 'oneWeek', label: i18n.ts.oneWeek,
-		}, {
-			value: 'oneMonth', label: i18n.ts.oneMonth,
-		}],
-		default: 'indefinitely',
+	const res = await os.selectPeriod({
+		title: `${i18n.ts.period}: ${role.name}`,
 	});
-	if (canceled2) return;
+	if (res.canceled) return;
 
-	const expiresAt = period === 'indefinitely' ? null
-		: period === 'oneHour' ? Date.now() + (1000 * 60 * 60)
-		: period === 'oneDay' ? Date.now() + (1000 * 60 * 60 * 24)
-		: period === 'oneWeek' ? Date.now() + (1000 * 60 * 60 * 24 * 7)
-		: period === 'oneMonth' ? Date.now() + (1000 * 60 * 60 * 24 * 30)
-		: null;
-
-	await os.apiWithDialog('admin/roles/assign', { roleId: role.id, userId: user.id, expiresAt });
+	await os.apiWithDialog('admin/roles/assign', { roleId: role.id, userId: user.id, expiresAt: res.expiresAt });
 	//role.users.push(user);
 }
 
diff --git a/packages/frontend/src/pages/channel.vue b/packages/frontend/src/pages/channel.vue
index aed64ff3cb..f783c0bdbf 100644
--- a/packages/frontend/src/pages/channel.vue
+++ b/packages/frontend/src/pages/channel.vue
@@ -81,6 +81,7 @@ import MkStreamingNotesTimeline from '@/components/MkStreamingNotesTimeline.vue'
 import XChannelFollowButton from '@/components/MkChannelFollowButton.vue';
 import * as os from '@/os.js';
 import { misskeyApi } from '@/utility/misskey-api.js';
+import { openMuteSettingDialog } from '@/utility/mute-confirm.js';
 import { $i, iAmModerator } from '@/i.js';
 import { i18n } from '@/i18n.js';
 import { definePage } from '@/page.js';
@@ -195,33 +196,14 @@ async function mute() {
 	if (!channel.value) return;
 	const _channel = channel.value;
 
-	const { canceled, result: period } = await os.select({
-		title: i18n.ts.mutePeriod,
-		items: [{
-			value: 'indefinitely', label: i18n.ts.indefinitely,
-		}, {
-			value: 'tenMinutes', label: i18n.ts.tenMinutes,
-		}, {
-			value: 'oneHour', label: i18n.ts.oneHour,
-		}, {
-			value: 'oneDay', label: i18n.ts.oneDay,
-		}, {
-			value: 'oneWeek', label: i18n.ts.oneWeek,
-		}],
-		default: 'indefinitely',
+	const res = await openMuteSettingDialog({
+		withMuteType: false,
 	});
-	if (canceled) return;
-
-	const expiresAt = period === 'indefinitely' ? null
-		: period === 'tenMinutes' ? Date.now() + (1000 * 60 * 10)
-		: period === 'oneHour' ? Date.now() + (1000 * 60 * 60)
-		: period === 'oneDay' ? Date.now() + (1000 * 60 * 60 * 24)
-		: period === 'oneWeek' ? Date.now() + (1000 * 60 * 60 * 24 * 7)
-		: null;
+	if (res.canceled) return;
 
 	os.apiWithDialog('channels/mute/create', {
 		channelId: _channel.id,
-		expiresAt,
+		expiresAt: res.expiresAt,
 	}).then(() => {
 		_channel.isMuting = true;
 	});
diff --git a/packages/frontend/src/utility/get-user-menu.ts b/packages/frontend/src/utility/get-user-menu.ts
index 64d4b421a3..e33ccf897c 100644
--- a/packages/frontend/src/utility/get-user-menu.ts
+++ b/packages/frontend/src/utility/get-user-menu.ts
@@ -18,20 +18,9 @@ import { notesSearchAvailable, canSearchNonLocalNotes } from '@/utility/check-pe
 import { antennasCache, rolesCache, userListsCache } from '@/cache.js';
 import { mainRouter } from '@/router.js';
 import { genEmbedCode } from '@/utility/get-embed-code.js';
+import { openMuteSettingDialog } from '@/utility/mute-confirm.js';
 import { prefer } from '@/preferences.js';
 import { getPluginHandlers } from '@/plugin.js';
-import type { MkMuteSettingDialogDoneEvent } from '@/components/MkMuteSettingDialog.vue';
-
-function muteConfirm(): Promise<MkMuteSettingDialogDoneEvent> {
-	return new Promise(resolve => {
-		const { dispose } = os.popup(defineAsyncComponent(() => import('@/components/MkMuteSettingDialog.vue')), {}, {
-			done: result => {
-				resolve(result ? result : { canceled: true });
-			},
-			closed: () => dispose(),
-		});
-	});
-}
 
 export function getUserMenu(user: Misskey.entities.UserDetailed, router: Router = mainRouter) {
 	const meId = $i ? $i.id : null;
@@ -46,19 +35,14 @@ export function getUserMenu(user: Misskey.entities.UserDetailed, router: Router
 				user.isMuted = false;
 			});
 		} else {
-			const res = await muteConfirm();
+			const res = await openMuteSettingDialog({
+				withMuteType: true,
+			});
 			if (res.canceled) return;
 
-			const expiresAt = res.period === 'indefinitely' ? null
-				: res.period === 'tenMinutes' ? Date.now() + (1000 * 60 * 10)
-				: res.period === 'oneHour' ? Date.now() + (1000 * 60 * 60)
-				: res.period === 'oneDay' ? Date.now() + (1000 * 60 * 60 * 24)
-				: res.period === 'oneWeek' ? Date.now() + (1000 * 60 * 60 * 24 * 7)
-				: null;
-
 			os.apiWithDialog('mute/create', {
 				userId: user.id,
-				expiresAt,
+				expiresAt: res.expiresAt,
 				mutingType: res.type,
 			}).then(() => {
 				user.isMuted = true;
@@ -323,31 +307,13 @@ export function getUserMenu(user: Misskey.entities.UserDetailed, router: Router
 					return roles.filter(r => r.target === 'manual').map(r => ({
 						text: r.name,
 						action: async () => {
-							const { canceled, result: period } = await os.select({
-								title: i18n.ts.period + ': ' + r.name,
-								items: [{
-									value: 'indefinitely', label: i18n.ts.indefinitely,
-								}, {
-									value: 'oneHour', label: i18n.ts.oneHour,
-								}, {
-									value: 'oneDay', label: i18n.ts.oneDay,
-								}, {
-									value: 'oneWeek', label: i18n.ts.oneWeek,
-								}, {
-									value: 'oneMonth', label: i18n.ts.oneMonth,
-								}],
-								default: 'indefinitely',
+							const res = await os.selectPeriod({
+								title: `${i18n.ts.period}: ${r.name}`,
 							});
-							if (canceled) return;
 
-							const expiresAt = period === 'indefinitely' ? null
-								: period === 'oneHour' ? Date.now() + (1000 * 60 * 60)
-								: period === 'oneDay' ? Date.now() + (1000 * 60 * 60 * 24)
-								: period === 'oneWeek' ? Date.now() + (1000 * 60 * 60 * 24 * 7)
-								: period === 'oneMonth' ? Date.now() + (1000 * 60 * 60 * 24 * 30)
-								: null;
+							if (res.canceled) return;
 
-							os.apiWithDialog('admin/roles/assign', { roleId: r.id, userId: user.id, expiresAt });
+							os.apiWithDialog('admin/roles/assign', { roleId: r.id, userId: user.id, expiresAt: res.expiresAt });
 						},
 					}));
 				},
diff --git a/packages/frontend/src/utility/mute-confirm.ts b/packages/frontend/src/utility/mute-confirm.ts
new file mode 100644
index 0000000000..343227bb6f
--- /dev/null
+++ b/packages/frontend/src/utility/mute-confirm.ts
@@ -0,0 +1,21 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { defineAsyncComponent } from 'vue';
+import * as os from '@/os.js';
+import type { MkMuteSettingDialogDoneEvent } from '@/components/MkMuteSettingDialog.vue';
+
+export function openMuteSettingDialog(opts?: { withMuteType?: boolean }): Promise<MkMuteSettingDialogDoneEvent> {
+	return new Promise(resolve => {
+		const { dispose } = os.popup(defineAsyncComponent(() => import('@/components/MkMuteSettingDialog.vue')), opts ?? {}, {
+			done: result => {
+				resolve(result ? result : { canceled: true });
+			},
+			closed: () => {
+				dispose();
+			 },
+		});
+	});
+}