merge: upstream performance changes & instance silencing

56 files changed, 180 insertions, 140 deletions

diff --git a/packages/backend/src/core/AccountMoveService.ts b/packages/backend/src/core/AccountMoveService.ts
index db64f42754..350aa6ba24 100644
--- a/packages/backend/src/core/AccountMoveService.ts
+++ b/packages/backend/src/core/AccountMoveService.ts
@@ -180,13 +180,13 @@ export class AccountMoveService {
 			{ muteeId: dst.id, expiresAt: IsNull() },
 		).then(mutings => mutings.map(muting => muting.muterId));
 
-		const newMutings: Map<string, { muterId: string; muteeId: string; createdAt: Date; expiresAt: Date | null; }> = new Map();
+		const newMutings: Map<string, { muterId: string; muteeId: string; expiresAt: Date | null; }> = new Map();
 
 		// 重複しないようにIDを生成
 		const genId = (): string => {
 			let id: string;
 			do {
-				id = this.idService.genId();
+				id = this.idService.gen();
 			} while (newMutings.has(id));
 			return id;
 		};
@@ -194,7 +194,6 @@ export class AccountMoveService {
 			if (existingMutingsMuterUserIds.includes(muting.muterId)) continue; // skip if already muted indefinitely
 			newMutings.set(genId(), {
 				...muting,
-				createdAt: new Date(),
 				muteeId: dst.id,
 			});
 		}
@@ -228,20 +227,19 @@ export class AccountMoveService {
 			},
 		}).then(memberships => memberships.map(membership => membership.userListId));
 
-		const newMemberships: Map<string, { createdAt: Date; userId: string; userListId: string; userListUserId: string; }> = new Map();
+		const newMemberships: Map<string, { userId: string; userListId: string; userListUserId: string; }> = new Map();
 
 		// 重複しないようにIDを生成
 		const genId = (): string => {
 			let id: string;
 			do {
-				id = this.idService.genId();
+				id = this.idService.gen();
 			} while (newMemberships.has(id));
 			return id;
 		};
 		for (const membership of oldMemberships) {
 			if (existingUserListIds.includes(membership.userListId)) continue; // skip if dst exists in this user's list
 			newMemberships.set(genId(), {
-				createdAt: new Date(),
 				userId: dst.id,
 				userListId: membership.userListId,
 				userListUserId: membership.userListUserId,
diff --git a/packages/backend/src/core/AnnouncementService.ts b/packages/backend/src/core/AnnouncementService.ts
index a5330db53f..ec1a082d78 100644
--- a/packages/backend/src/core/AnnouncementService.ts
+++ b/packages/backend/src/core/AnnouncementService.ts
@@ -53,7 +53,7 @@ export class AnnouncementService {
 			}))
 			.andWhere(new Brackets(qb => {
 				qb.orWhere('announcement.forExistingUsers = false');
-				qb.orWhere('announcement.createdAt > :createdAt', { createdAt: user.createdAt });
+				qb.orWhere('announcement.id > :userId', { userId: user.id });
 			}))
 			.andWhere(`announcement.id NOT IN (${ readsQuery.getQuery() })`);
 
@@ -65,8 +65,7 @@ export class AnnouncementService {
 	@bindThis
 	public async create(values: Partial<MiAnnouncement>, moderator?: MiUser): Promise<{ raw: MiAnnouncement; packed: Packed<'Announcement'> }> {
 		const announcement = await this.announcementsRepository.insert({
-			id: this.idService.genId(),
-			createdAt: new Date(),
+			id: this.idService.gen(),
 			updatedAt: null,
 			title: values.title,
 			text: values.text,
@@ -179,8 +178,7 @@ export class AnnouncementService {
 	public async read(user: MiUser, announcementId: MiAnnouncement['id']): Promise<void> {
 		try {
 			await this.announcementReadsRepository.insert({
-				id: this.idService.genId(),
-				createdAt: new Date(),
+				id: this.idService.gen(),
 				announcementId: announcementId,
 				userId: user.id,
 			});
@@ -204,7 +202,7 @@ export class AnnouncementService {
 		const reads = me ? (options?.reads ?? await this.getReads(me.id)) : [];
 		return announcements.map(announcement => ({
 			id: announcement.id,
-			createdAt: announcement.createdAt.toISOString(),
+			createdAt: this.idService.parse(announcement.id).date.toISOString(),
 			updatedAt: announcement.updatedAt?.toISOString() ?? null,
 			text: announcement.text,
 			title: announcement.title,
diff --git a/packages/backend/src/core/AntennaService.ts b/packages/backend/src/core/AntennaService.ts
index ca7624b1d4..94c8ad0cf1 100644
--- a/packages/backend/src/core/AntennaService.ts
+++ b/packages/backend/src/core/AntennaService.ts
@@ -57,14 +57,12 @@ export class AntennaService implements OnApplicationShutdown {
 				case 'antennaCreated':
 					this.antennas.push({
 						...body,
-						createdAt: new Date(body.createdAt),
 						lastUsedAt: new Date(body.lastUsedAt),
 					});
 					break;
 				case 'antennaUpdated':
 					this.antennas[this.antennas.findIndex(a => a.id === body.id)] = {
 						...body,
-						createdAt: new Date(body.createdAt),
 						lastUsedAt: new Date(body.lastUsedAt),
 					};
 					break;
@@ -100,6 +98,8 @@ export class AntennaService implements OnApplicationShutdown {
 		if (note.visibility === 'specified') return false;
 		if (note.visibility === 'followers') return false;
 
+		if (antenna.localOnly && noteUser.host != null) return false;
+
 		if (!antenna.withReplies && note.replyId != null) return false;
 
 		if (antenna.src === 'home') {
diff --git a/packages/backend/src/core/ClipService.ts b/packages/backend/src/core/ClipService.ts
index 3d9982e80f..e94f1eb531 100644
--- a/packages/backend/src/core/ClipService.ts
+++ b/packages/backend/src/core/ClipService.ts
@@ -46,8 +46,7 @@ export class ClipService {
 		}
 
 		const clip = await this.clipsRepository.insert({
-			id: this.idService.genId(),
-			createdAt: new Date(),
+			id: this.idService.gen(),
 			userId: me.id,
 			name: name,
 			isPublic: isPublic,
@@ -109,7 +108,7 @@ export class ClipService {
 
 		try {
 			await this.clipNotesRepository.insert({
-				id: this.idService.genId(),
+				id: this.idService.gen(),
 				noteId: noteId,
 				clipId: clip.id,
 			});
diff --git a/packages/backend/src/core/CreateSystemUserService.ts b/packages/backend/src/core/CreateSystemUserService.ts
index 0bd694b377..f1ebb4f60a 100644
--- a/packages/backend/src/core/CreateSystemUserService.ts
+++ b/packages/backend/src/core/CreateSystemUserService.ts
@@ -53,8 +53,7 @@ export class CreateSystemUserService {
 			if (exist) throw new Error('the user is already exists');
 
 			account = await transactionalEntityManager.insert(MiUser, {
-				id: this.idService.genId(),
-				createdAt: new Date(),
+				id: this.idService.gen(),
 				username: username,
 				usernameLower: username.toLowerCase(),
 				host: null,
diff --git a/packages/backend/src/core/CustomEmojiService.ts b/packages/backend/src/core/CustomEmojiService.ts
index e69254f727..75335f6ff3 100644
--- a/packages/backend/src/core/CustomEmojiService.ts
+++ b/packages/backend/src/core/CustomEmojiService.ts
@@ -73,7 +73,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
 		roleIdsThatCanBeUsedThisEmojiAsReaction: MiRole['id'][];
 	}, moderator?: MiUser): Promise<MiEmoji> {
 		const emoji = await this.emojisRepository.insert({
-			id: this.idService.genId(),
+			id: this.idService.gen(),
 			updatedAt: new Date(),
 			name: data.name,
 			category: data.category,
diff --git a/packages/backend/src/core/DriveService.ts b/packages/backend/src/core/DriveService.ts
index 4b4872a2d6..3f38cf4a22 100644
--- a/packages/backend/src/core/DriveService.ts
+++ b/packages/backend/src/core/DriveService.ts
@@ -568,8 +568,7 @@ export class DriveService {
 		const folder = await fetchFolder();
 
 		let file = new MiDriveFile();
-		file.id = this.idService.genId();
-		file.createdAt = new Date();
+		file.id = this.idService.gen();
 		file.userId = user ? user.id : null;
 		file.userHost = user ? user.host : null;
 		file.folderId = folder !== null ? folder.id : null;
diff --git a/packages/backend/src/core/FederatedInstanceService.ts b/packages/backend/src/core/FederatedInstanceService.ts
index 61806583c6..e41f010e48 100644
--- a/packages/backend/src/core/FederatedInstanceService.ts
+++ b/packages/backend/src/core/FederatedInstanceService.ts
@@ -56,7 +56,7 @@ export class FederatedInstanceService implements OnApplicationShutdown {
 
 		if (index == null) {
 			const i = await this.instancesRepository.insert({
-				id: this.idService.genId(),
+				id: this.idService.gen(),
 				host,
 				firstRetrievedAt: new Date(),
 			}).then(x => this.instancesRepository.findOneByOrFail(x.identifiers[0]));
diff --git a/packages/backend/src/core/HashtagService.ts b/packages/backend/src/core/HashtagService.ts
index ddff28359a..1a2f37be39 100644
--- a/packages/backend/src/core/HashtagService.ts
+++ b/packages/backend/src/core/HashtagService.ts
@@ -120,7 +120,7 @@ export class HashtagService {
 		} else {
 			if (isUserAttached) {
 				this.hashtagsRepository.insert({
-					id: this.idService.genId(),
+					id: this.idService.gen(),
 					name: tag,
 					mentionedUserIds: [],
 					mentionedUsersCount: 0,
@@ -137,7 +137,7 @@ export class HashtagService {
 				} as MiHashtag);
 			} else {
 				this.hashtagsRepository.insert({
-					id: this.idService.genId(),
+					id: this.idService.gen(),
 					name: tag,
 					mentionedUserIds: [user.id],
 					mentionedUsersCount: 1,
diff --git a/packages/backend/src/core/IdService.ts b/packages/backend/src/core/IdService.ts
index 06c58ad8a1..c98b8ea6fc 100644
--- a/packages/backend/src/core/IdService.ts
+++ b/packages/backend/src/core/IdService.ts
@@ -26,17 +26,21 @@ export class IdService {
 		this.method = config.id.toLowerCase();
 	}
 
+	/**
+	 * 時間を元にIDを生成します(省略時は現在日時)
+	 * @param time 日時
+	 */
 	@bindThis
-	public genId(date?: Date): string {
-		if (!date || (date > new Date())) date = new Date();
+	public gen(time?: number): string {
+		const t = (!time || (time > Date.now())) ? Date.now() : time;
 
 		switch (this.method) {
-			case 'aid': return genAid(date);
-			case 'aidx': return genAidx(date);
-			case 'meid': return genMeid(date);
-			case 'meidg': return genMeidg(date);
-			case 'ulid': return ulid(date.getTime());
-			case 'objectid': return genObjectId(date);
+			case 'aid': return genAid(t);
+			case 'aidx': return genAidx(t);
+			case 'meid': return genMeid(t);
+			case 'meidg': return genMeidg(t);
+			case 'ulid': return ulid(t);
+			case 'objectid': return genObjectId(t);
 			default: throw new Error('unrecognized id generation method');
 		}
 	}
diff --git a/packages/backend/src/core/ModerationLogService.ts b/packages/backend/src/core/ModerationLogService.ts
index f7f9063d92..8b78d02047 100644
--- a/packages/backend/src/core/ModerationLogService.ts
+++ b/packages/backend/src/core/ModerationLogService.ts
@@ -24,8 +24,7 @@ export class ModerationLogService {
 	@bindThis
 	public async log<T extends typeof moderationLogTypes[number]>(moderator: { id: MiUser['id'] }, type: T, info?: ModerationLogPayloads[T]) {
 		await this.moderationLogsRepository.insert({
-			id: this.idService.genId(),
-			createdAt: new Date(),
+			id: this.idService.gen(),
 			userId: moderator.id,
 			type: type,
 			info: (info as any) ?? {},
diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index ec50f3db43..da7e6b1336 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -56,6 +56,7 @@ import { SearchService } from '@/core/SearchService.js';
 import { FeaturedService } from '@/core/FeaturedService.js';
 import { RedisTimelineService } from '@/core/RedisTimelineService.js';
 import { nyaize } from '@/misc/nyaize.js';
+import { UtilityService } from '@/core/UtilityService.js';
 
 type NotificationType = 'reply' | 'renote' | 'quote' | 'mention';
 
@@ -215,6 +216,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 		private perUserNotesChart: PerUserNotesChart,
 		private activeUsersChart: ActiveUsersChart,
 		private instanceChart: InstanceChart,
+		private utilityService: UtilityService,
 	) { }
 
 	@bindThis
@@ -222,7 +224,6 @@ export class NoteCreateService implements OnApplicationShutdown {
 		id: MiUser['id'];
 		username: MiUser['username'];
 		host: MiUser['host'];
-		createdAt: MiUser['createdAt'];
 		isBot: MiUser['isBot'];
 		isCat: MiUser['isCat'];
 		speakAsCat: MiUser['speakAsCat'];
@@ -261,6 +262,12 @@ export class NoteCreateService implements OnApplicationShutdown {
 			}
 		}
 
+		const inSilencedInstance = this.utilityService.isSilencedHost((await this.metaService.fetch()).silencedHosts, user.host);
+
+		if (data.visibility === 'public' && inSilencedInstance && user.host !== null) {
+			data.visibility = 'home';
+		}
+
 		if (data.renote) {
 			switch (data.renote.visibility) {
 				case 'public':
@@ -384,8 +391,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 	@bindThis
 	private async insertNote(user: { id: MiUser['id']; host: MiUser['host']; }, data: Option, tags: string[], emojis: string[], mentionedUsers: MinimumUser[]) {
 		const insert = new MiNote({
-			id: this.idService.genId(data.createdAt!),
-			createdAt: data.createdAt!,
+			id: this.idService.gen(data.createdAt?.getTime()),
 			fileIds: data.files ? data.files.map(file => file.id) : [],
 			replyId: data.reply ? data.reply.id : null,
 			renoteId: data.renote ? data.renote.id : null,
@@ -484,7 +490,6 @@ export class NoteCreateService implements OnApplicationShutdown {
 		id: MiUser['id'];
 		username: MiUser['username'];
 		host: MiUser['host'];
-		createdAt: MiUser['createdAt'];
 		isBot: MiUser['isBot'];
 	}, data: Option, silent: boolean, tags: string[], mentionedUsers: MinimumUser[]) {
 		const meta = await this.metaService.fetch();
diff --git a/packages/backend/src/core/NoteEditService.ts b/packages/backend/src/core/NoteEditService.ts
index 1953863345..69c66d1000 100644
--- a/packages/backend/src/core/NoteEditService.ts
+++ b/packages/backend/src/core/NoteEditService.ts
@@ -53,6 +53,7 @@ import { RedisTimelineService } from '@/core/RedisTimelineService.js';
 import { AntennaService } from './AntennaService.js';
 import NotesChart from './chart/charts/notes.js';
 import PerUserNotesChart from './chart/charts/per-user-notes.js';
+import { UtilityService } from '@/core/UtilityService.js';
 
 type NotificationType = 'reply' | 'renote' | 'quote' | 'mention';
 
@@ -217,6 +218,7 @@ export class NoteEditService implements OnApplicationShutdown {
 		private perUserNotesChart: PerUserNotesChart,
 		private activeUsersChart: ActiveUsersChart,
 		private instanceChart: InstanceChart,
+		private utilityService: UtilityService,
 	) { }
 
 	@bindThis
@@ -224,7 +226,6 @@ export class NoteEditService implements OnApplicationShutdown {
 		id: MiUser['id'];
 		username: MiUser['username'];
 		host: MiUser['host'];
-		createdAt: MiUser['createdAt'];
 		isBot: MiUser['isBot'];
 	}, editid: MiNote['id'], data: Option, silent = false): Promise<MiNote> {
 		if (!editid) {
@@ -275,6 +276,12 @@ export class NoteEditService implements OnApplicationShutdown {
 			}
 		}
 
+		const inSilencedInstance = this.utilityService.isSilencedHost((await this.metaService.fetch()).silencedHosts, user.host);
+
+		if (data.visibility === 'public' && inSilencedInstance && user.host !== null) {
+			data.visibility = 'home';
+		}
+
 		if (data.renote) {
 			switch (data.renote.visibility) {
 				case 'public':
@@ -381,7 +388,7 @@ export class NoteEditService implements OnApplicationShutdown {
 		}
 
 		await this.noteEditRepository.insert({
-			id: this.idService.genId(),
+			id: this.idService.gen(),
 			noteId: oldnote.id,
 			text: data.text || undefined,
 			cw: data.cw,
@@ -391,7 +398,6 @@ export class NoteEditService implements OnApplicationShutdown {
 
 		const note = new MiNote({
 			id: oldnote.id,
-			createdAt: new Date(oldnote.createdAt!),
 			updatedAt: data.updatedAt ? data.updatedAt : new Date(),
 			fileIds: data.files ? data.files.map(file => file.id) : [],
 			replyId: data.reply ? data.reply.id : null,
@@ -486,7 +492,6 @@ export class NoteEditService implements OnApplicationShutdown {
 		id: MiUser['id'];
 		username: MiUser['username'];
 		host: MiUser['host'];
-		createdAt: MiUser['createdAt'];
 		isBot: MiUser['isBot'];
 	}, data: Option, silent: boolean, tags: string[], mentionedUsers: MinimumUser[]) {
 		// Register host
diff --git a/packages/backend/src/core/NotePiningService.ts b/packages/backend/src/core/NotePiningService.ts
index 147554ee9a..52abb4c2a1 100644
--- a/packages/backend/src/core/NotePiningService.ts
+++ b/packages/backend/src/core/NotePiningService.ts
@@ -71,8 +71,7 @@ export class NotePiningService {
 		}
 
 		await this.userNotePiningsRepository.insert({
-			id: this.idService.genId(),
-			createdAt: new Date(),
+			id: this.idService.gen(),
 			userId: user.id,
 			noteId: note.id,
 		} as MiUserNotePining);
diff --git a/packages/backend/src/core/NoteReadService.ts b/packages/backend/src/core/NoteReadService.ts
index 422e0192cf..03c1735e04 100644
--- a/packages/backend/src/core/NoteReadService.ts
+++ b/packages/backend/src/core/NoteReadService.ts
@@ -57,7 +57,7 @@ export class NoteReadService implements OnApplicationShutdown {
 		if (isThreadMuted) return;
 
 		const unread = {
-			id: this.idService.genId(),
+			id: this.idService.gen(),
 			noteId: note.id,
 			userId: userId,
 			isSpecified: params.isSpecified,
diff --git a/packages/backend/src/core/NotificationService.ts b/packages/backend/src/core/NotificationService.ts
index 32d54d2576..c6d5023e65 100644
--- a/packages/backend/src/core/NotificationService.ts
+++ b/packages/backend/src/core/NotificationService.ts
@@ -125,7 +125,7 @@ export class NotificationService implements OnApplicationShutdown {
 		}
 
 		const notification = {
-			id: this.idService.genId(),
+			id: this.idService.gen(),
 			createdAt: new Date(),
 			type: type,
 			notifierId: notifierId,
diff --git a/packages/backend/src/core/PollService.ts b/packages/backend/src/core/PollService.ts
index 570f2350f1..9e1b5ca78a 100644
--- a/packages/backend/src/core/PollService.ts
+++ b/packages/backend/src/core/PollService.ts
@@ -72,10 +72,8 @@ export class PollService {
 			throw new Error('already voted');
 		}
 
-		// Create vote
 		await this.pollVotesRepository.insert({
-			id: this.idService.genId(),
-			createdAt: new Date(),
+			id: this.idService.gen(),
 			noteId: note.id,
 			userId: user.id,
 			choice: choice,
diff --git a/packages/backend/src/core/QueryService.ts b/packages/backend/src/core/QueryService.ts
index 50d1d2e65b..ae8f8a3f19 100644
--- a/packages/backend/src/core/QueryService.ts
+++ b/packages/backend/src/core/QueryService.ts
@@ -52,14 +52,14 @@ export class QueryService {
 			q.andWhere(`${q.alias}.id < :untilId`, { untilId: untilId });
 			q.orderBy(`${q.alias}.id`, 'DESC');
 		} else if (sinceDate && untilDate) {
-			q.andWhere(`${q.alias}.id > :sinceId`, { sinceId: this.idService.genId(new Date(sinceDate)) });
-			q.andWhere(`${q.alias}.id < :untilId`, { untilId: this.idService.genId(new Date(untilDate)) });
+			q.andWhere(`${q.alias}.id > :sinceId`, { sinceId: this.idService.gen(sinceDate) });
+			q.andWhere(`${q.alias}.id < :untilId`, { untilId: this.idService.gen(untilDate) });
 			q.orderBy(`${q.alias}.id`, 'DESC');
 		} else if (sinceDate) {
-			q.andWhere(`${q.alias}.id > :sinceId`, { sinceId: this.idService.genId(new Date(sinceDate)) });
+			q.andWhere(`${q.alias}.id > :sinceId`, { sinceId: this.idService.gen(sinceDate) });
 			q.orderBy(`${q.alias}.id`, 'ASC');
 		} else if (untilDate) {
-			q.andWhere(`${q.alias}.id < :untilId`, { untilId: this.idService.genId(new Date(untilDate)) });
+			q.andWhere(`${q.alias}.id < :untilId`, { untilId: this.idService.gen(untilDate) });
 			q.orderBy(`${q.alias}.id`, 'DESC');
 		} else {
 			q.orderBy(`${q.alias}.id`, 'DESC');
diff --git a/packages/backend/src/core/ReactionService.ts b/packages/backend/src/core/ReactionService.ts
index e7bbd44926..49b465a0f8 100644
--- a/packages/backend/src/core/ReactionService.ts
+++ b/packages/backend/src/core/ReactionService.ts
@@ -153,8 +153,7 @@ export class ReactionService {
 		}
 
 		const record: MiNoteReaction = {
-			id: this.idService.genId(),
-			createdAt: new Date(),
+			id: this.idService.gen(),
 			noteId: note.id,
 			userId: user.id,
 			reaction,
diff --git a/packages/backend/src/core/RelayService.ts b/packages/backend/src/core/RelayService.ts
index 7171bf84c5..d40cd080c7 100644
--- a/packages/backend/src/core/RelayService.ts
+++ b/packages/backend/src/core/RelayService.ts
@@ -54,7 +54,7 @@ export class RelayService {
 	@bindThis
 	public async addRelay(inbox: string): Promise<MiRelay> {
 		const relay = await this.relaysRepository.insert({
-			id: this.idService.genId(),
+			id: this.idService.gen(),
 			inbox,
 			status: 'requesting',
 		}).then(x => this.relaysRepository.findOneByOrFail(x.identifiers[0]));
diff --git a/packages/backend/src/core/RoleService.ts b/packages/backend/src/core/RoleService.ts
index 2c3547e4ac..d18fb240f7 100644
--- a/packages/backend/src/core/RoleService.ts
+++ b/packages/backend/src/core/RoleService.ts
@@ -125,7 +125,6 @@ export class RoleService implements OnApplicationShutdown {
 					if (cached) {
 						cached.push({
 							...body,
-							createdAt: new Date(body.createdAt),
 							updatedAt: new Date(body.updatedAt),
 							lastUsedAt: new Date(body.lastUsedAt),
 						});
@@ -139,7 +138,6 @@ export class RoleService implements OnApplicationShutdown {
 						if (i > -1) {
 							cached[i] = {
 								...body,
-								createdAt: new Date(body.createdAt),
 								updatedAt: new Date(body.updatedAt),
 								lastUsedAt: new Date(body.lastUsedAt),
 							};
@@ -159,7 +157,6 @@ export class RoleService implements OnApplicationShutdown {
 					if (cached) {
 						cached.push({
 							...body,
-							createdAt: new Date(body.createdAt),
 							expiresAt: body.expiresAt ? new Date(body.expiresAt) : null,
 						});
 					}
@@ -198,10 +195,10 @@ export class RoleService implements OnApplicationShutdown {
 					return this.userEntityService.isRemoteUser(user);
 				}
 				case 'createdLessThan': {
-					return user.createdAt.getTime() > (Date.now() - (value.sec * 1000));
+					return this.idService.parse(user.id).date.getTime() > (Date.now() - (value.sec * 1000));
 				}
 				case 'createdMoreThan': {
-					return user.createdAt.getTime() < (Date.now() - (value.sec * 1000));
+					return this.idService.parse(user.id).date.getTime() < (Date.now() - (value.sec * 1000));
 				}
 				case 'followersLessThanOrEq': {
 					return user.followersCount <= value.value;
@@ -382,7 +379,7 @@ export class RoleService implements OnApplicationShutdown {
 
 	@bindThis
 	public async assign(userId: MiUser['id'], roleId: MiRole['id'], expiresAt: Date | null = null, moderator?: MiUser): Promise<void> {
-		const now = new Date();
+		const now = Date.now();
 
 		const role = await this.rolesRepository.findOneByOrFail({ id: roleId });
 
@@ -392,7 +389,7 @@ export class RoleService implements OnApplicationShutdown {
 		});
 
 		if (existing) {
-			if (existing.expiresAt && (existing.expiresAt.getTime() < now.getTime())) {
+			if (existing.expiresAt && (existing.expiresAt.getTime() < now)) {
 				await this.roleAssignmentsRepository.delete({
 					roleId: roleId,
 					userId: userId,
@@ -403,8 +400,7 @@ export class RoleService implements OnApplicationShutdown {
 		}
 
 		const created = await this.roleAssignmentsRepository.insert({
-			id: this.idService.genId(),
-			createdAt: now,
+			id: this.idService.gen(now),
 			expiresAt: expiresAt,
 			roleId: roleId,
 			userId: userId,
@@ -485,8 +481,7 @@ export class RoleService implements OnApplicationShutdown {
 	public async create(values: Partial<MiRole>, moderator?: MiUser): Promise<MiRole> {
 		const date = new Date();
 		const created = await this.rolesRepository.insert({
-			id: this.idService.genId(),
-			createdAt: date,
+			id: this.idService.gen(date.getTime()),
 			updatedAt: date,
 			lastUsedAt: date,
 			name: values.name,
diff --git a/packages/backend/src/core/SearchService.ts b/packages/backend/src/core/SearchService.ts
index 3ef321dd32..b6d2bcabc8 100644
--- a/packages/backend/src/core/SearchService.ts
+++ b/packages/backend/src/core/SearchService.ts
@@ -131,7 +131,7 @@ export class SearchService {
 
 			await this.meilisearchNoteIndex?.addDocuments([{
 				id: note.id,
-				createdAt: note.createdAt.getTime(),
+				createdAt: this.idService.parse(note.id).date.getTime(),
 				userId: note.userId,
 				userHost: note.userHost,
 				channelId: note.channelId,
diff --git a/packages/backend/src/core/SignupService.ts b/packages/backend/src/core/SignupService.ts
index 48a25ed3ca..359957cd52 100644
--- a/packages/backend/src/core/SignupService.ts
+++ b/packages/backend/src/core/SignupService.ts
@@ -121,8 +121,7 @@ export class SignupService {
 			if (exist) throw new Error(' the username is already used');
 
 			account = await transactionalEntityManager.save(new MiUser({
-				id: this.idService.genId(),
-				createdAt: new Date(),
+				id: this.idService.gen(),
 				username: username,
 				usernameLower: username.toLowerCase(),
 				host: this.utilityService.toPunyNullable(host),
diff --git a/packages/backend/src/core/UserBlockingService.ts b/packages/backend/src/core/UserBlockingService.ts
index 087dfd9214..39b19325c3 100644
--- a/packages/backend/src/core/UserBlockingService.ts
+++ b/packages/backend/src/core/UserBlockingService.ts
@@ -68,8 +68,7 @@ export class UserBlockingService implements OnModuleInit {
 		]);
 
 		const blocking = {
-			id: this.idService.genId(),
-			createdAt: new Date(),
+			id: this.idService.gen(),
 			blocker,
 			blockerId: blocker.id,
 			blockee,
diff --git a/packages/backend/src/core/UserFollowingService.ts b/packages/backend/src/core/UserFollowingService.ts
index beffcc2e9c..87484f0383 100644
--- a/packages/backend/src/core/UserFollowingService.ts
+++ b/packages/backend/src/core/UserFollowingService.ts
@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { Inject, Injectable, OnModuleInit, forwardRef } from '@nestjs/common';
+import { Inject, Injectable, OnModuleInit } from '@nestjs/common';
 import { ModuleRef } from '@nestjs/core';
 import { IsNull } from 'typeorm';
 import type { MiLocalUser, MiPartialLocalUser, MiPartialRemoteUser, MiRemoteUser, MiUser } from '@/models/User.js';
@@ -28,6 +28,7 @@ import { MetaService } from '@/core/MetaService.js';
 import { CacheService } from '@/core/CacheService.js';
 import type { Config } from '@/config.js';
 import { AccountMoveService } from '@/core/AccountMoveService.js';
+import { UtilityService } from '@/core/UtilityService.js';
 import Logger from '../logger.js';
 
 const logger = new Logger('following/create');
@@ -71,6 +72,7 @@ export class UserFollowingService implements OnModuleInit {
 		private instancesRepository: InstancesRepository,
 
 		private cacheService: CacheService,
+		private utilityService: UtilityService,
 		private userEntityService: UserEntityService,
 		private idService: IdService,
 		private queueService: QueueService,
@@ -118,15 +120,16 @@ export class UserFollowingService implements OnModuleInit {
 		}
 
 		const followeeProfile = await this.userProfilesRepository.findOneByOrFail({ userId: followee.id });
-
 		// フォロー対象が鍵アカウントである or
 		// フォロワーがBotであり、フォロー対象がBotからのフォローに慎重である or
-		// フォロワーがローカルユーザーであり、フォロー対象がリモートユーザーである
+		// フォロワーがローカルユーザーであり、フォロー対象がリモートユーザーである or
+		// フォロワーがローカルユーザーであり、フォロー対象がサイレンスされているサーバーである
 		// 上記のいずれかに当てはまる場合はすぐフォローせずにフォローリクエストを発行しておく
 		if (
 			followee.isLocked ||
 			(followeeProfile.carefulBot && follower.isBot) ||
-			(this.userEntityService.isLocalUser(follower) && this.userEntityService.isRemoteUser(followee) && process.env.FORCE_FOLLOW_REMOTE_USER_FOR_TESTING !== 'true')
+			(this.userEntityService.isLocalUser(follower) && this.userEntityService.isRemoteUser(followee) && process.env.FORCE_FOLLOW_REMOTE_USER_FOR_TESTING !== 'true') ||
+			(this.userEntityService.isLocalUser(followee) && this.userEntityService.isRemoteUser(follower) && this.utilityService.isSilencedHost((await this.metaService.fetch()).silencedHosts, follower.host))
 		) {
 			let autoAccept = false;
 
@@ -196,8 +199,7 @@ export class UserFollowingService implements OnModuleInit {
 		let alreadyFollowed = false as boolean;
 
 		await this.followingsRepository.insert({
-			id: this.idService.genId(),
-			createdAt: new Date(),
+			id: this.idService.gen(),
 			followerId: follower.id,
 			followeeId: followee.id,
 
@@ -465,8 +467,7 @@ export class UserFollowingService implements OnModuleInit {
 		if (blocked) throw new Error('blocked');
 
 		const followRequest = await this.followRequestsRepository.insert({
-			id: this.idService.genId(),
-			createdAt: new Date(),
+			id: this.idService.gen(),
 			followerId: follower.id,
 			followeeId: followee.id,
 			requestId,
diff --git a/packages/backend/src/core/UserListService.ts b/packages/backend/src/core/UserListService.ts
index 5b4e7a711e..702c731fc3 100644
--- a/packages/backend/src/core/UserListService.ts
+++ b/packages/backend/src/core/UserListService.ts
@@ -93,8 +93,7 @@ export class UserListService implements OnApplicationShutdown {
 		}
 
 		await this.userListMembershipsRepository.insert({
-			id: this.idService.genId(),
-			createdAt: new Date(),
+			id: this.idService.gen(),
 			userId: target.id,
 			userListId: list.id,
 			userListUserId: list.userId,
diff --git a/packages/backend/src/core/UserMutingService.ts b/packages/backend/src/core/UserMutingService.ts
index 2387c9d648..397e6bdd5d 100644
--- a/packages/backend/src/core/UserMutingService.ts
+++ b/packages/backend/src/core/UserMutingService.ts
@@ -26,8 +26,7 @@ export class UserMutingService {
 	@bindThis
 	public async mute(user: MiUser, target: MiUser, expiresAt: Date | null = null): Promise<void> {
 		await this.mutingsRepository.insert({
-			id: this.idService.genId(),
-			createdAt: new Date(),
+			id: this.idService.gen(),
 			expiresAt: expiresAt ?? null,
 			muterId: user.id,
 			muteeId: target.id,
diff --git a/packages/backend/src/core/UtilityService.ts b/packages/backend/src/core/UtilityService.ts
index d2d2776bd2..b95e41167b 100644
--- a/packages/backend/src/core/UtilityService.ts
+++ b/packages/backend/src/core/UtilityService.ts
@@ -36,6 +36,12 @@ export class UtilityService {
 	}
 
 	@bindThis
+	public isSilencedHost(silencedHosts: string[] | undefined, host: string | null): boolean {
+		if (!silencedHosts || host == null) return false;
+		return silencedHosts.some(x => `.${host.toLowerCase()}`.endsWith(`.${x}`));
+	}
+
+	@bindThis
 	public extractDbHost(uri: string): string {
 		const url = new URL(uri);
 		return this.toPuny(url.hostname);
diff --git a/packages/backend/src/core/WebhookService.ts b/packages/backend/src/core/WebhookService.ts
index ff70f7bc0c..930e6ef64a 100644
--- a/packages/backend/src/core/WebhookService.ts
+++ b/packages/backend/src/core/WebhookService.ts
@@ -51,7 +51,6 @@ export class WebhookService implements OnApplicationShutdown {
 					if (body.active) {
 						this.webhooks.push({
 							...body,
-							createdAt: new Date(body.createdAt),
 							latestSentAt: body.latestSentAt ? new Date(body.latestSentAt) : null,
 						});
 					}
@@ -62,13 +61,11 @@ export class WebhookService implements OnApplicationShutdown {
 						if (i > -1) {
 							this.webhooks[i] = {
 								...body,
-								createdAt: new Date(body.createdAt),
 								latestSentAt: body.latestSentAt ? new Date(body.latestSentAt) : null,
 							};
 						} else {
 							this.webhooks.push({
 								...body,
-								createdAt: new Date(body.createdAt),
 								latestSentAt: body.latestSentAt ? new Date(body.latestSentAt) : null,
 							});
 						}
diff --git a/packages/backend/src/core/activitypub/ApInboxService.ts b/packages/backend/src/core/activitypub/ApInboxService.ts
index f1f821b299..048d527762 100644
--- a/packages/backend/src/core/activitypub/ApInboxService.ts
+++ b/packages/backend/src/core/activitypub/ApInboxService.ts
@@ -514,8 +514,7 @@ export class ApInboxService {
 		if (users.length < 1) return 'skip';
 
 		await this.abuseUserReportsRepository.insert({
-			id: this.idService.genId(),
-			createdAt: new Date(),
+			id: this.idService.gen(),
 			targetUserId: users[0].id,
 			targetUserHost: users[0].host,
 			reporterId: actor.id,
diff --git a/packages/backend/src/core/activitypub/ApRendererService.ts b/packages/backend/src/core/activitypub/ApRendererService.ts
index b47d785663..bfbe62e2a9 100644
--- a/packages/backend/src/core/activitypub/ApRendererService.ts
+++ b/packages/backend/src/core/activitypub/ApRendererService.ts
@@ -27,6 +27,7 @@ import type { UsersRepository, UserProfilesRepository, NotesRepository, DriveFil
 import { bindThis } from '@/decorators.js';
 import { CustomEmojiService } from '@/core/CustomEmojiService.js';
 import { isNotNull } from '@/misc/is-not-null.js';
+import { IdService } from '@/core/IdService.js';
 import { LdSignatureService } from './LdSignatureService.js';
 import { ApMfmService } from './ApMfmService.js';
 import type { IAccept, IActivity, IAdd, IAnnounce, IApDocument, IApEmoji, IApHashtag, IApImage, IApMention, IBlock, ICreate, IDelete, IFlag, IFollow, IKey, ILike, IMove, IObject, IPost, IQuestion, IReject, IRemove, ITombstone, IUndo, IUpdate } from './type.js';
@@ -59,6 +60,7 @@ export class ApRendererService {
 		private userKeypairService: UserKeypairService,
 		private apMfmService: ApMfmService,
 		private mfmService: MfmService,
+		private idService: IdService,
 	) {
 	}
 
@@ -105,7 +107,7 @@ export class ApRendererService {
 			id: `${this.config.url}/notes/${note.id}/activity`,
 			actor: this.userEntityService.genLocalUserUri(note.userId),
 			type: 'Announce',
-			published: note.createdAt.toISOString(),
+			published: this.idService.parse(note.id).date.toISOString(),
 			to,
 			cc,
 			object,
@@ -137,7 +139,7 @@ export class ApRendererService {
 			id: `${this.config.url}/notes/${note.id}/activity`,
 			actor: this.userEntityService.genLocalUserUri(note.userId),
 			type: 'Create',
-			published: note.createdAt.toISOString(),
+			published: this.idService.parse(note.id).date.toISOString(),
 			object,
 		};
 
@@ -438,7 +440,7 @@ export class ApRendererService {
 			_misskey_quote: quote,
 			quoteUrl: quote,
 			quoteUri: quote,
-			published: note.createdAt.toISOString(),
+			published: this.idService.parse(note.id).date.toISOString(),
 			to,
 			cc,
 			inReplyTo,
@@ -731,7 +733,7 @@ export class ApRendererService {
 			_misskey_quote: quote,
 			quoteUrl: quote,
 			quoteUri: quote,
-			published: note.createdAt.toISOString(),
+			published: this.idService.parse(note.id).date.toISOString(),
 			to,
 			cc,
 			inReplyTo,
diff --git a/packages/backend/src/core/activitypub/models/ApNoteService.ts b/packages/backend/src/core/activitypub/models/ApNoteService.ts
index 5a8f90405a..72488b1c37 100644
--- a/packages/backend/src/core/activitypub/models/ApNoteService.ts
+++ b/packages/backend/src/core/activitypub/models/ApNoteService.ts
@@ -599,7 +599,7 @@ export class ApNoteService {
 			this.logger.info(`register emoji host=${host}, name=${name}`);
 
 			return await this.emojisRepository.insert({
-				id: this.idService.genId(),
+				id: this.idService.gen(),
 				host,
 				name,
 				uri: tag.id,
diff --git a/packages/backend/src/core/activitypub/models/ApPersonService.ts b/packages/backend/src/core/activitypub/models/ApPersonService.ts
index 76b8073087..07dfe7c476 100644
--- a/packages/backend/src/core/activitypub/models/ApPersonService.ts
+++ b/packages/backend/src/core/activitypub/models/ApPersonService.ts
@@ -304,11 +304,10 @@ export class ApPersonService implements OnModuleInit {
 			// Start transaction
 			await this.db.transaction(async transactionalEntityManager => {
 				user = await transactionalEntityManager.save(new MiUser({
-					id: this.idService.genId(),
+					id: this.idService.gen(),
 					avatarId: null,
 					bannerId: null,
 					backgroundId: null,
-					createdAt: new Date(),
 					lastFetchedAt: new Date(),
 					name: truncate(person.name, nameLength),
 					isLocked: person.manuallyApprovesFollowers,
@@ -624,8 +623,7 @@ export class ApPersonService implements OnModuleInit {
 			for (const note of featuredNotes.filter((note): note is MiNote => note != null)) {
 				td -= 1000;
 				transactionalEntityManager.insert(MiUserNotePining, {
-					id: this.idService.genId(new Date(Date.now() + td)),
-					createdAt: new Date(),
+					id: this.idService.gen(Date.now() + td),
 					userId: user.id,
 					noteId: note.id,
 				});
diff --git a/packages/backend/src/core/chart/charts/active-users.ts b/packages/backend/src/core/chart/charts/active-users.ts
index 55da1469e5..f0918e059c 100644
--- a/packages/backend/src/core/chart/charts/active-users.ts
+++ b/packages/backend/src/core/chart/charts/active-users.ts
@@ -9,6 +9,7 @@ import { AppLockService } from '@/core/AppLockService.js';
 import type { MiUser } from '@/models/User.js';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import Chart from '../core.js';
 import { ChartLoggerService } from '../ChartLoggerService.js';
 import { name, schema } from './entities/active-users.js';
@@ -29,6 +30,7 @@ export default class ActiveUsersChart extends Chart<typeof schema> { // eslint-d
 
 		private appLockService: AppLockService,
 		private chartLoggerService: ChartLoggerService,
+		private idService: IdService,
 	) {
 		super(db, (k) => appLockService.getChartInsertLock(k), chartLoggerService.logger, name, schema);
 	}
@@ -42,20 +44,21 @@ export default class ActiveUsersChart extends Chart<typeof schema> { // eslint-d
 	}
 
 	@bindThis
-	public async read(user: { id: MiUser['id'], host: null, createdAt: MiUser['createdAt'] }): Promise<void> {
+	public async read(user: { id: MiUser['id'], host: null }): Promise<void> {
+		const createdAt = this.idService.parse(user.id).date;
 		await this.commit({
 			'read': [user.id],
-			'registeredWithinWeek': (Date.now() - user.createdAt.getTime() < week) ? [user.id] : [],
-			'registeredWithinMonth': (Date.now() - user.createdAt.getTime() < month) ? [user.id] : [],
-			'registeredWithinYear': (Date.now() - user.createdAt.getTime() < year) ? [user.id] : [],
-			'registeredOutsideWeek': (Date.now() - user.createdAt.getTime() > week) ? [user.id] : [],
-			'registeredOutsideMonth': (Date.now() - user.createdAt.getTime() > month) ? [user.id] : [],
-			'registeredOutsideYear': (Date.now() - user.createdAt.getTime() > year) ? [user.id] : [],
+			'registeredWithinWeek': (Date.now() - createdAt.getTime() < week) ? [user.id] : [],
+			'registeredWithinMonth': (Date.now() - createdAt.getTime() < month) ? [user.id] : [],
+			'registeredWithinYear': (Date.now() - createdAt.getTime() < year) ? [user.id] : [],
+			'registeredOutsideWeek': (Date.now() - createdAt.getTime() > week) ? [user.id] : [],
+			'registeredOutsideMonth': (Date.now() - createdAt.getTime() > month) ? [user.id] : [],
+			'registeredOutsideYear': (Date.now() - createdAt.getTime() > year) ? [user.id] : [],
 		});
 	}
 
 	@bindThis
-	public async write(user: { id: MiUser['id'], host: null, createdAt: MiUser['createdAt'] }): Promise<void> {
+	public async write(user: { id: MiUser['id'], host: null }): Promise<void> {
 		await this.commit({
 			'write': [user.id],
 		});
diff --git a/packages/backend/src/core/entities/AbuseUserReportEntityService.ts b/packages/backend/src/core/entities/AbuseUserReportEntityService.ts
index 0e65a10d26..97de891ece 100644
--- a/packages/backend/src/core/entities/AbuseUserReportEntityService.ts
+++ b/packages/backend/src/core/entities/AbuseUserReportEntityService.ts
@@ -9,6 +9,7 @@ import type { AbuseUserReportsRepository } from '@/models/_.js';
 import { awaitAll } from '@/misc/prelude/await-all.js';
 import type { MiAbuseUserReport } from '@/models/AbuseUserReport.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import { UserEntityService } from './UserEntityService.js';
 
 @Injectable()
@@ -18,6 +19,7 @@ export class AbuseUserReportEntityService {
 		private abuseUserReportsRepository: AbuseUserReportsRepository,
 
 		private userEntityService: UserEntityService,
+		private idService: IdService,
 	) {
 	}
 
@@ -29,7 +31,7 @@ export class AbuseUserReportEntityService {
 
 		return await awaitAll({
 			id: report.id,
-			createdAt: report.createdAt.toISOString(),
+			createdAt: this.idService.parse(report.id).date.toISOString(),
 			comment: report.comment,
 			resolved: report.resolved,
 			reporterId: report.reporterId,
diff --git a/packages/backend/src/core/entities/AntennaEntityService.ts b/packages/backend/src/core/entities/AntennaEntityService.ts
index ed108f2ce5..265a61e8ad 100644
--- a/packages/backend/src/core/entities/AntennaEntityService.ts
+++ b/packages/backend/src/core/entities/AntennaEntityService.ts
@@ -9,12 +9,15 @@ import type { AntennasRepository } from '@/models/_.js';
 import type { Packed } from '@/misc/json-schema.js';
 import type { MiAntenna } from '@/models/Antenna.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 
 @Injectable()
 export class AntennaEntityService {
 	constructor(
 		@Inject(DI.antennasRepository)
 		private antennasRepository: AntennasRepository,
+
+		private idService: IdService,
 	) {
 	}
 
@@ -26,7 +29,7 @@ export class AntennaEntityService {
 
 		return {
 			id: antenna.id,
-			createdAt: antenna.createdAt.toISOString(),
+			createdAt: this.idService.parse(antenna.id).date.toISOString(),
 			name: antenna.name,
 			keywords: antenna.keywords,
 			excludeKeywords: antenna.excludeKeywords,
@@ -34,6 +37,7 @@ export class AntennaEntityService {
 			userListId: antenna.userListId,
 			users: antenna.users,
 			caseSensitive: antenna.caseSensitive,
+			localOnly: antenna.localOnly,
 			notify: antenna.notify,
 			withReplies: antenna.withReplies,
 			withFile: antenna.withFile,
diff --git a/packages/backend/src/core/entities/BlockingEntityService.ts b/packages/backend/src/core/entities/BlockingEntityService.ts
index 44466e24e8..b4760346b7 100644
--- a/packages/backend/src/core/entities/BlockingEntityService.ts
+++ b/packages/backend/src/core/entities/BlockingEntityService.ts
@@ -11,6 +11,7 @@ import type { Packed } from '@/misc/json-schema.js';
 import type { MiBlocking } from '@/models/Blocking.js';
 import type { MiUser } from '@/models/User.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import { UserEntityService } from './UserEntityService.js';
 
 @Injectable()
@@ -20,6 +21,7 @@ export class BlockingEntityService {
 		private blockingsRepository: BlockingsRepository,
 
 		private userEntityService: UserEntityService,
+		private idService: IdService,
 	) {
 	}
 
@@ -32,7 +34,7 @@ export class BlockingEntityService {
 
 		return await awaitAll({
 			id: blocking.id,
-			createdAt: blocking.createdAt.toISOString(),
+			createdAt: this.idService.parse(blocking.id).date.toISOString(),
 			blockeeId: blocking.blockeeId,
 			blockee: this.userEntityService.pack(blocking.blockeeId, me, {
 				detail: true,
diff --git a/packages/backend/src/core/entities/ChannelEntityService.ts b/packages/backend/src/core/entities/ChannelEntityService.ts
index 094de4d2d5..dd72953c7d 100644
--- a/packages/backend/src/core/entities/ChannelEntityService.ts
+++ b/packages/backend/src/core/entities/ChannelEntityService.ts
@@ -11,6 +11,7 @@ import type { } from '@/models/Blocking.js';
 import type { MiUser } from '@/models/User.js';
 import type { MiChannel } from '@/models/Channel.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import { DriveFileEntityService } from './DriveFileEntityService.js';
 import { NoteEntityService } from './NoteEntityService.js';
 import { In } from 'typeorm';
@@ -38,6 +39,7 @@ export class ChannelEntityService {
 
 		private noteEntityService: NoteEntityService,
 		private driveFileEntityService: DriveFileEntityService,
+		private idService: IdService,
 	) {
 	}
 
@@ -81,7 +83,7 @@ export class ChannelEntityService {
 
 		return {
 			id: channel.id,
-			createdAt: channel.createdAt.toISOString(),
+			createdAt: this.idService.parse(channel.id).date.toISOString(),
 			lastNotedAt: channel.lastNotedAt ? channel.lastNotedAt.toISOString() : null,
 			name: channel.name,
 			description: channel.description,
diff --git a/packages/backend/src/core/entities/ClipEntityService.ts b/packages/backend/src/core/entities/ClipEntityService.ts
index e141db03f1..96422894fd 100644
--- a/packages/backend/src/core/entities/ClipEntityService.ts
+++ b/packages/backend/src/core/entities/ClipEntityService.ts
@@ -11,6 +11,7 @@ import type { Packed } from '@/misc/json-schema.js';
 import type { } from '@/models/Blocking.js';
 import type { MiClip } from '@/models/Clip.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import { UserEntityService } from './UserEntityService.js';
 
 @Injectable()
@@ -23,6 +24,7 @@ export class ClipEntityService {
 		private clipFavoritesRepository: ClipFavoritesRepository,
 
 		private userEntityService: UserEntityService,
+		private idService: IdService,
 	) {
 	}
 
@@ -36,7 +38,7 @@ export class ClipEntityService {
 
 		return await awaitAll({
 			id: clip.id,
-			createdAt: clip.createdAt.toISOString(),
+			createdAt: this.idService.parse(clip.id).date.toISOString(),
 			lastClippedAt: clip.lastClippedAt ? clip.lastClippedAt.toISOString() : null,
 			userId: clip.userId,
 			user: this.userEntityService.pack(clip.user ?? clip.userId),
diff --git a/packages/backend/src/core/entities/DriveFileEntityService.ts b/packages/backend/src/core/entities/DriveFileEntityService.ts
index 23273b0413..5148b2ca9e 100644
--- a/packages/backend/src/core/entities/DriveFileEntityService.ts
+++ b/packages/backend/src/core/entities/DriveFileEntityService.ts
@@ -17,6 +17,7 @@ import { deepClone } from '@/misc/clone.js';
 import { bindThis } from '@/decorators.js';
 import { isMimeImage } from '@/misc/is-mime-image.js';
 import { isNotNull } from '@/misc/is-not-null.js';
+import { IdService } from '@/core/IdService.js';
 import { UtilityService } from '../UtilityService.js';
 import { VideoProcessingService } from '../VideoProcessingService.js';
 import { UserEntityService } from './UserEntityService.js';
@@ -44,6 +45,7 @@ export class DriveFileEntityService {
 		private utilityService: UtilityService,
 		private driveFolderEntityService: DriveFolderEntityService,
 		private videoProcessingService: VideoProcessingService,
+		private idService: IdService,
 	) {
 	}
 
@@ -196,7 +198,7 @@ export class DriveFileEntityService {
 
 		return await awaitAll<Packed<'DriveFile'>>({
 			id: file.id,
-			createdAt: file.createdAt.toISOString(),
+			createdAt: this.idService.parse(file.id).date.toISOString(),
 			name: file.name,
 			type: file.type,
 			md5: file.md5,
@@ -231,7 +233,7 @@ export class DriveFileEntityService {
 
 		return await awaitAll<Packed<'DriveFile'>>({
 			id: file.id,
-			createdAt: file.createdAt.toISOString(),
+			createdAt: this.idService.parse(file.id).date.toISOString(),
 			name: file.name,
 			type: file.type,
 			md5: file.md5,
diff --git a/packages/backend/src/core/entities/DriveFolderEntityService.ts b/packages/backend/src/core/entities/DriveFolderEntityService.ts
index 55014284bd..8fa78154b9 100644
--- a/packages/backend/src/core/entities/DriveFolderEntityService.ts
+++ b/packages/backend/src/core/entities/DriveFolderEntityService.ts
@@ -11,6 +11,7 @@ import type { Packed } from '@/misc/json-schema.js';
 import type { } from '@/models/Blocking.js';
 import type { MiDriveFolder } from '@/models/DriveFolder.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 
 @Injectable()
 export class DriveFolderEntityService {
@@ -20,6 +21,8 @@ export class DriveFolderEntityService {
 
 		@Inject(DI.driveFilesRepository)
 		private driveFilesRepository: DriveFilesRepository,
+
+		private idService: IdService,
 	) {
 	}
 
@@ -38,7 +41,7 @@ export class DriveFolderEntityService {
 
 		return await awaitAll({
 			id: folder.id,
-			createdAt: folder.createdAt.toISOString(),
+			createdAt: this.idService.parse(folder.id).date.toISOString(),
 			name: folder.name,
 			parentId: folder.parentId,
 
diff --git a/packages/backend/src/core/entities/FlashEntityService.ts b/packages/backend/src/core/entities/FlashEntityService.ts
index 4701cddcba..dc335d9975 100644
--- a/packages/backend/src/core/entities/FlashEntityService.ts
+++ b/packages/backend/src/core/entities/FlashEntityService.ts
@@ -12,6 +12,7 @@ import type { } from '@/models/Blocking.js';
 import type { MiUser } from '@/models/User.js';
 import type { MiFlash } from '@/models/Flash.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import { UserEntityService } from './UserEntityService.js';
 
 @Injectable()
@@ -24,6 +25,7 @@ export class FlashEntityService {
 		private flashLikesRepository: FlashLikesRepository,
 
 		private userEntityService: UserEntityService,
+		private idService: IdService,
 	) {
 	}
 
@@ -37,7 +39,7 @@ export class FlashEntityService {
 
 		return await awaitAll({
 			id: flash.id,
-			createdAt: flash.createdAt.toISOString(),
+			createdAt: this.idService.parse(flash.id).date.toISOString(),
 			updatedAt: flash.updatedAt.toISOString(),
 			userId: flash.userId,
 			user: this.userEntityService.pack(flash.user ?? flash.userId, me), // { detail: true } すると無限ループするので注意
diff --git a/packages/backend/src/core/entities/FollowingEntityService.ts b/packages/backend/src/core/entities/FollowingEntityService.ts
index 9f6eb51e8c..52aa979677 100644
--- a/packages/backend/src/core/entities/FollowingEntityService.ts
+++ b/packages/backend/src/core/entities/FollowingEntityService.ts
@@ -12,6 +12,7 @@ import type { } from '@/models/Blocking.js';
 import type { MiUser } from '@/models/User.js';
 import type { MiFollowing } from '@/models/Following.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import { UserEntityService } from './UserEntityService.js';
 
 type LocalFollowerFollowing = MiFollowing & {
@@ -45,6 +46,7 @@ export class FollowingEntityService {
 		private followingsRepository: FollowingsRepository,
 
 		private userEntityService: UserEntityService,
+		private idService: IdService,
 	) {
 	}
 
@@ -83,7 +85,7 @@ export class FollowingEntityService {
 
 		return await awaitAll({
 			id: following.id,
-			createdAt: following.createdAt.toISOString(),
+			createdAt: this.idService.parse(following.id).date.toISOString(),
 			followeeId: following.followeeId,
 			followerId: following.followerId,
 			followee: opts.populateFollowee ? this.userEntityService.pack(following.followee ?? following.followeeId, me, {
diff --git a/packages/backend/src/core/entities/GalleryPostEntityService.ts b/packages/backend/src/core/entities/GalleryPostEntityService.ts
index bbaf70f0fd..d7b960e0d9 100644
--- a/packages/backend/src/core/entities/GalleryPostEntityService.ts
+++ b/packages/backend/src/core/entities/GalleryPostEntityService.ts
@@ -12,6 +12,7 @@ import type { } from '@/models/Blocking.js';
 import type { MiUser } from '@/models/User.js';
 import type { MiGalleryPost } from '@/models/GalleryPost.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import { UserEntityService } from './UserEntityService.js';
 import { DriveFileEntityService } from './DriveFileEntityService.js';
 
@@ -26,6 +27,7 @@ export class GalleryPostEntityService {
 
 		private userEntityService: UserEntityService,
 		private driveFileEntityService: DriveFileEntityService,
+		private idService: IdService,
 	) {
 	}
 
@@ -39,7 +41,7 @@ export class GalleryPostEntityService {
 
 		return await awaitAll({
 			id: post.id,
-			createdAt: post.createdAt.toISOString(),
+			createdAt: this.idService.parse(post.id).date.toISOString(),
 			updatedAt: post.updatedAt.toISOString(),
 			userId: post.userId,
 			user: this.userEntityService.pack(post.user ?? post.userId, me),
diff --git a/packages/backend/src/core/entities/InstanceEntityService.ts b/packages/backend/src/core/entities/InstanceEntityService.ts
index 0e27e9df7f..9afe87eab7 100644
--- a/packages/backend/src/core/entities/InstanceEntityService.ts
+++ b/packages/backend/src/core/entities/InstanceEntityService.ts
@@ -3,9 +3,8 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { Injectable } from '@nestjs/common';
+import { Inject, Injectable } from '@nestjs/common';
 import type { Packed } from '@/misc/json-schema.js';
-import type { } from '@/models/Blocking.js';
 import type { MiInstance } from '@/models/Instance.js';
 import { MetaService } from '@/core/MetaService.js';
 import { bindThis } from '@/decorators.js';
@@ -43,6 +42,7 @@ export class InstanceEntityService {
 			description: instance.description,
 			maintainerName: instance.maintainerName,
 			maintainerEmail: instance.maintainerEmail,
+			isSilenced: this.utilityService.isSilencedHost(meta.silencedHosts, instance.host),
 			iconUrl: instance.iconUrl,
 			faviconUrl: instance.faviconUrl,
 			themeColor: instance.themeColor,
diff --git a/packages/backend/src/core/entities/InviteCodeEntityService.ts b/packages/backend/src/core/entities/InviteCodeEntityService.ts
index 914eaafe68..0f15fb5ab2 100644
--- a/packages/backend/src/core/entities/InviteCodeEntityService.ts
+++ b/packages/backend/src/core/entities/InviteCodeEntityService.ts
@@ -11,6 +11,7 @@ import type { Packed } from '@/misc/json-schema.js';
 import type { MiUser } from '@/models/User.js';
 import type { MiRegistrationTicket } from '@/models/RegistrationTicket.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import { UserEntityService } from './UserEntityService.js';
 
 @Injectable()
@@ -20,6 +21,7 @@ export class InviteCodeEntityService {
 		private registrationTicketsRepository: RegistrationTicketsRepository,
 
 		private userEntityService: UserEntityService,
+		private idService: IdService,
 	) {
 	}
 
@@ -39,7 +41,7 @@ export class InviteCodeEntityService {
 			id: target.id,
 			code: target.code,
 			expiresAt: target.expiresAt ? target.expiresAt.toISOString() : null,
-			createdAt: target.createdAt.toISOString(),
+			createdAt: this.idService.parse(target.id).date.toISOString(),
 			createdBy: target.createdBy ? await this.userEntityService.pack(target.createdBy, me) : null,
 			usedBy: target.usedBy ? await this.userEntityService.pack(target.usedBy, me) : null,
 			usedAt: target.usedAt ? target.usedAt.toISOString() : null,
diff --git a/packages/backend/src/core/entities/ModerationLogEntityService.ts b/packages/backend/src/core/entities/ModerationLogEntityService.ts
index 83b024d83b..6729ca2671 100644
--- a/packages/backend/src/core/entities/ModerationLogEntityService.ts
+++ b/packages/backend/src/core/entities/ModerationLogEntityService.ts
@@ -10,6 +10,7 @@ import { awaitAll } from '@/misc/prelude/await-all.js';
 import type { } from '@/models/Blocking.js';
 import type { MiModerationLog } from '@/models/ModerationLog.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import { UserEntityService } from './UserEntityService.js';
 
 @Injectable()
@@ -19,6 +20,7 @@ export class ModerationLogEntityService {
 		private moderationLogsRepository: ModerationLogsRepository,
 
 		private userEntityService: UserEntityService,
+		private idService: IdService,
 	) {
 	}
 
@@ -30,7 +32,7 @@ export class ModerationLogEntityService {
 
 		return await awaitAll({
 			id: log.id,
-			createdAt: log.createdAt.toISOString(),
+			createdAt: this.idService.parse(log.id).date.toISOString(),
 			type: log.type,
 			info: log.info,
 			userId: log.userId,
diff --git a/packages/backend/src/core/entities/MutingEntityService.ts b/packages/backend/src/core/entities/MutingEntityService.ts
index e3d5d2e211..9d672169ba 100644
--- a/packages/backend/src/core/entities/MutingEntityService.ts
+++ b/packages/backend/src/core/entities/MutingEntityService.ts
@@ -12,6 +12,7 @@ import type { } from '@/models/Blocking.js';
 import type { MiUser } from '@/models/User.js';
 import type { MiMuting } from '@/models/Muting.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import { UserEntityService } from './UserEntityService.js';
 
 @Injectable()
@@ -21,6 +22,7 @@ export class MutingEntityService {
 		private mutingsRepository: MutingsRepository,
 
 		private userEntityService: UserEntityService,
+		private idService: IdService,
 	) {
 	}
 
@@ -33,7 +35,7 @@ export class MutingEntityService {
 
 		return await awaitAll({
 			id: muting.id,
-			createdAt: muting.createdAt.toISOString(),
+			createdAt: this.idService.parse(muting.id).date.toISOString(),
 			expiresAt: muting.expiresAt ? muting.expiresAt.toISOString() : null,
 			muteeId: muting.muteeId,
 			mutee: this.userEntityService.pack(muting.muteeId, me, {
diff --git a/packages/backend/src/core/entities/NoteEntityService.ts b/packages/backend/src/core/entities/NoteEntityService.ts
index 498cf4721f..d593f66253 100644
--- a/packages/backend/src/core/entities/NoteEntityService.ts
+++ b/packages/backend/src/core/entities/NoteEntityService.ts
@@ -314,7 +314,7 @@ export class NoteEntityService implements OnModuleInit {
 
 		const packed: Packed<'Note'> = await awaitAll({
 			id: note.id,
-			createdAt: note.createdAt.toISOString(),
+			createdAt: this.idService.parse(note.id).date.toISOString(),
 			updatedAt: note.updatedAt ? note.updatedAt.toISOString() : undefined,
 			userId: note.userId,
 			user: this.userEntityService.pack(note.user ?? note.userId, me, {
@@ -389,7 +389,8 @@ export class NoteEntityService implements OnModuleInit {
 		if (meId) {
 			const renoteIds = notes.filter(n => n.renoteId != null).map(n => n.renoteId!);
 			// パフォーマンスのためノートが作成されてから2秒以上経っていない場合はリアクションを取得しない
-			const targets = [...notes.filter(n => n.createdAt.getTime() + 2000 < Date.now()).map(n => n.id), ...renoteIds];
+			const oldId = this.idService.gen(Date.now() - 2000);
+			const targets = [...notes.filter(n => n.id < oldId).map(n => n.id), ...renoteIds];
 			const myReactions = await this.noteReactionsRepository.findBy({
 				userId: meId,
 				noteId: In(targets),
diff --git a/packages/backend/src/core/entities/NoteFavoriteEntityService.ts b/packages/backend/src/core/entities/NoteFavoriteEntityService.ts
index 808c8c9f69..1c9aed413f 100644
--- a/packages/backend/src/core/entities/NoteFavoriteEntityService.ts
+++ b/packages/backend/src/core/entities/NoteFavoriteEntityService.ts
@@ -10,6 +10,7 @@ import type { } from '@/models/Blocking.js';
 import type { MiUser } from '@/models/User.js';
 import type { MiNoteFavorite } from '@/models/NoteFavorite.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import { NoteEntityService } from './NoteEntityService.js';
 
 @Injectable()
@@ -19,6 +20,7 @@ export class NoteFavoriteEntityService {
 		private noteFavoritesRepository: NoteFavoritesRepository,
 
 		private noteEntityService: NoteEntityService,
+		private idService: IdService,
 	) {
 	}
 
@@ -31,7 +33,7 @@ export class NoteFavoriteEntityService {
 
 		return {
 			id: favorite.id,
-			createdAt: favorite.createdAt.toISOString(),
+			createdAt: this.idService.parse(favorite.id).date.toISOString(),
 			noteId: favorite.noteId,
 			note: await this.noteEntityService.pack(favorite.note ?? favorite.noteId, me),
 		};
diff --git a/packages/backend/src/core/entities/NoteReactionEntityService.ts b/packages/backend/src/core/entities/NoteReactionEntityService.ts
index 9701f37fdb..f4aba3e543 100644
--- a/packages/backend/src/core/entities/NoteReactionEntityService.ts
+++ b/packages/backend/src/core/entities/NoteReactionEntityService.ts
@@ -8,6 +8,7 @@ import { DI } from '@/di-symbols.js';
 import type { NoteReactionsRepository } from '@/models/_.js';
 import type { Packed } from '@/misc/json-schema.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import type { OnModuleInit } from '@nestjs/common';
 import type { } from '@/models/Blocking.js';
 import type { MiUser } from '@/models/User.js';
@@ -22,6 +23,7 @@ export class NoteReactionEntityService implements OnModuleInit {
 	private userEntityService: UserEntityService;
 	private noteEntityService: NoteEntityService;
 	private reactionService: ReactionService;
+	private idService: IdService;
 
 	constructor(
 		private moduleRef: ModuleRef,
@@ -32,6 +34,7 @@ export class NoteReactionEntityService implements OnModuleInit {
 		//private userEntityService: UserEntityService,
 		//private noteEntityService: NoteEntityService,
 		//private reactionService: ReactionService,
+		//private idService: IdService,
 	) {
 	}
 
@@ -39,6 +42,7 @@ export class NoteReactionEntityService implements OnModuleInit {
 		this.userEntityService = this.moduleRef.get('UserEntityService');
 		this.noteEntityService = this.moduleRef.get('NoteEntityService');
 		this.reactionService = this.moduleRef.get('ReactionService');
+		this.idService = this.moduleRef.get('IdService');
 	}
 
 	@bindThis
@@ -57,7 +61,7 @@ export class NoteReactionEntityService implements OnModuleInit {
 
 		return {
 			id: reaction.id,
-			createdAt: reaction.createdAt.toISOString(),
+			createdAt: this.idService.parse(reaction.id).date.toISOString(),
 			user: await this.userEntityService.pack(reaction.user ?? reaction.userId, me),
 			type: this.reactionService.convertLegacyReaction(reaction.reaction),
 			...(opts.withNote ? {
diff --git a/packages/backend/src/core/entities/PageEntityService.ts b/packages/backend/src/core/entities/PageEntityService.ts
index e3a1e19ddd..f39ef949db 100644
--- a/packages/backend/src/core/entities/PageEntityService.ts
+++ b/packages/backend/src/core/entities/PageEntityService.ts
@@ -13,6 +13,7 @@ import type { MiUser } from '@/models/User.js';
 import type { MiPage } from '@/models/Page.js';
 import type { MiDriveFile } from '@/models/DriveFile.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import { UserEntityService } from './UserEntityService.js';
 import { DriveFileEntityService } from './DriveFileEntityService.js';
 
@@ -30,6 +31,7 @@ export class PageEntityService {
 
 		private userEntityService: UserEntityService,
 		private driveFileEntityService: DriveFileEntityService,
+		private idService: IdService,
 	) {
 	}
 
@@ -85,7 +87,7 @@ export class PageEntityService {
 
 		return await awaitAll({
 			id: page.id,
-			createdAt: page.createdAt.toISOString(),
+			createdAt: this.idService.parse(page.id).date.toISOString(),
 			updatedAt: page.updatedAt.toISOString(),
 			userId: page.userId,
 			user: this.userEntityService.pack(page.user ?? page.userId, me), // { detail: true } すると無限ループするので注意
diff --git a/packages/backend/src/core/entities/RenoteMutingEntityService.ts b/packages/backend/src/core/entities/RenoteMutingEntityService.ts
index 7111fab08a..3f9dc9180a 100644
--- a/packages/backend/src/core/entities/RenoteMutingEntityService.ts
+++ b/packages/backend/src/core/entities/RenoteMutingEntityService.ts
@@ -12,6 +12,7 @@ import type { } from '@/models/Blocking.js';
 import type { MiUser } from '@/models/User.js';
 import type { MiRenoteMuting } from '@/models/RenoteMuting.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import { UserEntityService } from './UserEntityService.js';
 
 @Injectable()
@@ -21,6 +22,7 @@ export class RenoteMutingEntityService {
 		private renoteMutingsRepository: RenoteMutingsRepository,
 
 		private userEntityService: UserEntityService,
+		private idService: IdService,
 	) {
 	}
 
@@ -33,7 +35,7 @@ export class RenoteMutingEntityService {
 
 		return await awaitAll({
 			id: muting.id,
-			createdAt: muting.createdAt.toISOString(),
+			createdAt: this.idService.parse(muting.id).date.toISOString(),
 			muteeId: muting.muteeId,
 			mutee: this.userEntityService.pack(muting.muteeId, me, {
 				detail: true,
diff --git a/packages/backend/src/core/entities/RoleEntityService.ts b/packages/backend/src/core/entities/RoleEntityService.ts
index 79375a7008..5563f9a1ac 100644
--- a/packages/backend/src/core/entities/RoleEntityService.ts
+++ b/packages/backend/src/core/entities/RoleEntityService.ts
@@ -12,6 +12,7 @@ import type { MiUser } from '@/models/User.js';
 import type { MiRole } from '@/models/Role.js';
 import { bindThis } from '@/decorators.js';
 import { DEFAULT_POLICIES } from '@/core/RoleService.js';
+import { IdService } from '@/core/IdService.js';
 
 @Injectable()
 export class RoleEntityService {
@@ -21,6 +22,8 @@ export class RoleEntityService {
 
 		@Inject(DI.roleAssignmentsRepository)
 		private roleAssignmentsRepository: RoleAssignmentsRepository,
+
+		private idService: IdService,
 	) {
 	}
 
@@ -51,7 +54,7 @@ export class RoleEntityService {
 
 		return await awaitAll({
 			id: role.id,
-			createdAt: role.createdAt.toISOString(),
+			createdAt: this.idService.parse(role.id).date.toISOString(),
 			updatedAt: role.updatedAt.toISOString(),
 			name: role.name,
 			description: role.description,
diff --git a/packages/backend/src/core/entities/UserEntityService.ts b/packages/backend/src/core/entities/UserEntityService.ts
index 1be63f027c..3de95129fc 100644
--- a/packages/backend/src/core/entities/UserEntityService.ts
+++ b/packages/backend/src/core/entities/UserEntityService.ts
@@ -20,6 +20,7 @@ import { bindThis } from '@/decorators.js';
 import { RoleService } from '@/core/RoleService.js';
 import { ApPersonService } from '@/core/activitypub/models/ApPersonService.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
+import { IdService } from '@/core/IdService.js';
 import type { OnModuleInit } from '@nestjs/common';
 import type { AnnouncementService } from '../AnnouncementService.js';
 import type { CustomEmojiService } from '../CustomEmojiService.js';
@@ -60,6 +61,7 @@ export class UserEntityService implements OnModuleInit {
 	private announcementService: AnnouncementService;
 	private roleService: RoleService;
 	private federatedInstanceService: FederatedInstanceService;
+	private idService: IdService;
 
 	constructor(
 		private moduleRef: ModuleRef,
@@ -111,13 +113,6 @@ export class UserEntityService implements OnModuleInit {
 
 		@Inject(DI.userMemosRepository)
 		private userMemosRepository: UserMemoRepository,
-
-		//private noteEntityService: NoteEntityService,
-		//private driveFileEntityService: DriveFileEntityService,
-		//private pageEntityService: PageEntityService,
-		//private customEmojiService: CustomEmojiService,
-		//private antennaService: AntennaService,
-		//private roleService: RoleService,
 	) {
 	}
 
@@ -130,6 +125,7 @@ export class UserEntityService implements OnModuleInit {
 		this.announcementService = this.moduleRef.get('AnnouncementService');
 		this.roleService = this.moduleRef.get('RoleService');
 		this.federatedInstanceService = this.moduleRef.get('FederatedInstanceService');
+		this.idService = this.moduleRef.get('IdService');
 	}
 
 	//#region Validators
@@ -369,7 +365,7 @@ export class UserEntityService implements OnModuleInit {
 			avatarUrl: user.avatarUrl ?? this.getIdenticonUrl(user),
 			avatarBlurhash: user.avatarBlurhash,
 			description: mastoapi ? mastoapi.description : profile ? profile.description : '',
-			createdAt: user.createdAt.toISOString(),
+			createdAt: this.idService.parse(user.id).date.toISOString(),
 			isBot: user.isBot ?? falsy,
 			isCat: user.isCat ?? falsy,
 			speakAsCat: user.speakAsCat ?? falsy,
diff --git a/packages/backend/src/core/entities/UserListEntityService.ts b/packages/backend/src/core/entities/UserListEntityService.ts
index 06b6e852b1..31ab7293da 100644
--- a/packages/backend/src/core/entities/UserListEntityService.ts
+++ b/packages/backend/src/core/entities/UserListEntityService.ts
@@ -10,6 +10,7 @@ import type { Packed } from '@/misc/json-schema.js';
 import type { } from '@/models/Blocking.js';
 import type { MiUserList } from '@/models/UserList.js';
 import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
 import { UserEntityService } from './UserEntityService.js';
 
 @Injectable()
@@ -22,6 +23,7 @@ export class UserListEntityService {
 		private userListMembershipsRepository: UserListMembershipsRepository,
 
 		private userEntityService: UserEntityService,
+		private idService: IdService,
 	) {
 	}
 
@@ -37,7 +39,7 @@ export class UserListEntityService {
 
 		return {
 			id: userList.id,
-			createdAt: userList.createdAt.toISOString(),
+			createdAt: this.idService.parse(userList.id).date.toISOString(),
 			name: userList.name,
 			userIds: users.map(x => x.userId),
 			isPublic: userList.isPublic,
@@ -50,7 +52,7 @@ export class UserListEntityService {
 	) {
 		return Promise.all(memberships.map(async x => ({
 			id: x.id,
-			createdAt: x.createdAt.toISOString(),
+			createdAt: this.idService.parse(x.id).date.toISOString(),
 			userId: x.userId,
 			user: await this.userEntityService.pack(x.userId),
 			withReplies: x.withReplies,