diff --git a/packages/backend/package.json b/packages/backend/package.json
index 05641389f0..1944de73f5 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -24,7 +24,6 @@
 		"@types/bcryptjs": "2.4.2",
 		"@types/bull": "3.15.7",
 		"@types/cbor": "6.0.0",
-		"@types/dateformat": "5.0.0",
 		"@types/escape-regexp": "0.0.1",
 		"@types/glob": "7.2.0",
 		"@types/is-url": "1.2.30",
@@ -87,7 +86,7 @@
 		"cli-highlight": "2.1.11",
 		"content-disposition": "0.5.4",
 		"crc-32": "1.2.1",
-		"dateformat": "4.5.1",
+		"date-fns": "2.28.0",
 		"deep-email-validator": "0.1.21",
 		"escape-regexp": "0.0.1",
 		"eslint": "8.8.0",
diff --git a/packages/backend/src/queue/processors/db/export-blocking.ts b/packages/backend/src/queue/processors/db/export-blocking.ts
index 01edaaeb63..f4de9ce005 100644
--- a/packages/backend/src/queue/processors/db/export-blocking.ts
+++ b/packages/backend/src/queue/processors/db/export-blocking.ts
@@ -4,7 +4,7 @@ import * as fs from 'fs';
 
 import { queueLogger } from '../../logger';
 import { addFile } from '@/services/drive/add-file';
-import * as dateFormat from 'dateformat';
+import { format as dateFormat } from 'date-fns';
 import { getFullApAccount } from '@/misc/convert-host';
 import { Users, Blockings } from '@/models/index';
 import { MoreThan } from 'typeorm';
@@ -85,7 +85,7 @@ export async function exportBlocking(job: Bull.Job<DbUserJobData>, done: any): P
 	stream.end();
 	logger.succ(`Exported to: ${path}`);
 
-	const fileName = 'blocking-' + dateFormat(new Date(), 'yyyy-mm-dd-HH-MM-ss') + '.csv';
+	const fileName = 'blocking-' + dateFormat(new Date(), 'yyyy-MM-dd-HH-mm-ss') + '.csv';
 	const driveFile = await addFile({ user, path, name: fileName, force: true });
 
 	logger.succ(`Exported to: ${driveFile.id}`);
diff --git a/packages/backend/src/queue/processors/db/export-custom-emojis.ts b/packages/backend/src/queue/processors/db/export-custom-emojis.ts
index 240a542fec..2f7505f158 100644
--- a/packages/backend/src/queue/processors/db/export-custom-emojis.ts
+++ b/packages/backend/src/queue/processors/db/export-custom-emojis.ts
@@ -7,7 +7,7 @@ const mime = require('mime-types');
 const archiver = require('archiver');
 import { queueLogger } from '../../logger';
 import { addFile } from '@/services/drive/add-file';
-import * as dateFormat from 'dateformat';
+import { format as dateFormat } from 'date-fns';
 import { Users, Emojis } from '@/models/index';
 import {  } from '@/queue/types';
 import { downloadUrl } from '@/misc/download-url';
@@ -110,7 +110,7 @@ export async function exportCustomEmojis(job: Bull.Job, done: () => void): Promi
 	archiveStream.on('close', async () => {
 		logger.succ(`Exported to: ${archivePath}`);
 
-		const fileName = 'custom-emojis-' + dateFormat(new Date(), 'yyyy-mm-dd-HH-MM-ss') + '.zip';
+		const fileName = 'custom-emojis-' + dateFormat(new Date(), 'yyyy-MM-dd-HH-mm-ss') + '.zip';
 		const driveFile = await addFile({ user, path: archivePath, name: fileName, force: true });
 
 		logger.succ(`Exported to: ${driveFile.id}`);
diff --git a/packages/backend/src/queue/processors/db/export-following.ts b/packages/backend/src/queue/processors/db/export-following.ts
index 06572acec1..2ac558381b 100644
--- a/packages/backend/src/queue/processors/db/export-following.ts
+++ b/packages/backend/src/queue/processors/db/export-following.ts
@@ -4,7 +4,7 @@ import * as fs from 'fs';
 
 import { queueLogger } from '../../logger';
 import { addFile } from '@/services/drive/add-file';
-import * as dateFormat from 'dateformat';
+import { format as dateFormat } from 'date-fns';
 import { getFullApAccount } from '@/misc/convert-host';
 import { Users, Followings, Mutings } from '@/models/index';
 import { In, MoreThan, Not } from 'typeorm';
@@ -86,7 +86,7 @@ export async function exportFollowing(job: Bull.Job<DbUserJobData>, done: () =>
 	stream.end();
 	logger.succ(`Exported to: ${path}`);
 
-	const fileName = 'following-' + dateFormat(new Date(), 'yyyy-mm-dd-HH-MM-ss') + '.csv';
+	const fileName = 'following-' + dateFormat(new Date(), 'yyyy-MM-dd-HH-mm-ss') + '.csv';
 	const driveFile = await addFile({ user, path, name: fileName, force: true });
 
 	logger.succ(`Exported to: ${driveFile.id}`);
diff --git a/packages/backend/src/queue/processors/db/export-mute.ts b/packages/backend/src/queue/processors/db/export-mute.ts
index 4a856f8ef9..9e917ccbf3 100644
--- a/packages/backend/src/queue/processors/db/export-mute.ts
+++ b/packages/backend/src/queue/processors/db/export-mute.ts
@@ -4,7 +4,7 @@ import * as fs from 'fs';
 
 import { queueLogger } from '../../logger';
 import { addFile } from '@/services/drive/add-file';
-import * as dateFormat from 'dateformat';
+import { format as dateFormat } from 'date-fns';
 import { getFullApAccount } from '@/misc/convert-host';
 import { Users, Mutings } from '@/models/index';
 import { MoreThan } from 'typeorm';
@@ -85,7 +85,7 @@ export async function exportMute(job: Bull.Job<DbUserJobData>, done: any): Promi
 	stream.end();
 	logger.succ(`Exported to: ${path}`);
 
-	const fileName = 'mute-' + dateFormat(new Date(), 'yyyy-mm-dd-HH-MM-ss') + '.csv';
+	const fileName = 'mute-' + dateFormat(new Date(), 'yyyy-MM-dd-HH-mm-ss') + '.csv';
 	const driveFile = await addFile({ user, path, name: fileName, force: true });
 
 	logger.succ(`Exported to: ${driveFile.id}`);
diff --git a/packages/backend/src/queue/processors/db/export-notes.ts b/packages/backend/src/queue/processors/db/export-notes.ts
index 305abf44cf..0e65cb8849 100644
--- a/packages/backend/src/queue/processors/db/export-notes.ts
+++ b/packages/backend/src/queue/processors/db/export-notes.ts
@@ -4,7 +4,7 @@ import * as fs from 'fs';
 
 import { queueLogger } from '../../logger';
 import { addFile } from '@/services/drive/add-file';
-import * as dateFormat from 'dateformat';
+import { format as dateFormat } from 'date-fns';
 import { Users, Notes, Polls } from '@/models/index';
 import { MoreThan } from 'typeorm';
 import { Note } from '@/models/entities/note';
@@ -94,7 +94,7 @@ export async function exportNotes(job: Bull.Job<DbUserJobData>, done: any): Prom
 	stream.end();
 	logger.succ(`Exported to: ${path}`);
 
-	const fileName = 'notes-' + dateFormat(new Date(), 'yyyy-mm-dd-HH-MM-ss') + '.json';
+	const fileName = 'notes-' + dateFormat(new Date(), 'yyyy-MM-dd-HH-mm-ss') + '.json';
 	const driveFile = await addFile({ user, path, name: fileName, force: true });
 
 	logger.succ(`Exported to: ${driveFile.id}`);
diff --git a/packages/backend/src/queue/processors/db/export-user-lists.ts b/packages/backend/src/queue/processors/db/export-user-lists.ts
index f907cf9526..fcd2ba336c 100644
--- a/packages/backend/src/queue/processors/db/export-user-lists.ts
+++ b/packages/backend/src/queue/processors/db/export-user-lists.ts
@@ -4,7 +4,7 @@ import * as fs from 'fs';
 
 import { queueLogger } from '../../logger';
 import { addFile } from '@/services/drive/add-file';
-import * as dateFormat from 'dateformat';
+import { format as dateFormat } from 'date-fns';
 import { getFullApAccount } from '@/misc/convert-host';
 import { Users, UserLists, UserListJoinings } from '@/models/index';
 import { In } from 'typeorm';
@@ -62,7 +62,7 @@ export async function exportUserLists(job: Bull.Job<DbUserJobData>, done: any):
 	stream.end();
 	logger.succ(`Exported to: ${path}`);
 
-	const fileName = 'user-lists-' + dateFormat(new Date(), 'yyyy-mm-dd-HH-MM-ss') + '.csv';
+	const fileName = 'user-lists-' + dateFormat(new Date(), 'yyyy-MM-dd-HH-mm-ss') + '.csv';
 	const driveFile = await addFile({ user, path, name: fileName, force: true });
 
 	logger.succ(`Exported to: ${driveFile.id}`);
diff --git a/packages/backend/yarn.lock b/packages/backend/yarn.lock
index 202d70b5e6..0f272c5023 100644
--- a/packages/backend/yarn.lock
+++ b/packages/backend/yarn.lock
@@ -403,11 +403,6 @@
     "@types/keygrip" "*"
     "@types/node" "*"
 
-"@types/dateformat@5.0.0":
-  version "5.0.0"
-  resolved "https://registry.yarnpkg.com/@types/dateformat/-/dateformat-5.0.0.tgz#17ce64b0318f3f36d1c830c58a7a915445f1f93d"
-  integrity sha512-SZg4JdHIWHQGEokbYGZSDvo5wA4TLYPXaqhigs/wH+REDOejcJzgH+qyY+HtEUtWOZxEUkbhbdYPqQDiEgrXeA==
-
 "@types/disposable-email-domains@^1.0.1":
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/@types/disposable-email-domains/-/disposable-email-domains-1.0.2.tgz#0280f6b38fa7f14e54b056a434135ecd254483b1"
@@ -2099,10 +2094,10 @@ data-urls@^3.0.1:
     whatwg-mimetype "^3.0.0"
     whatwg-url "^10.0.0"
 
-dateformat@4.5.1:
-  version "4.5.1"
-  resolved "https://registry.yarnpkg.com/dateformat/-/dateformat-4.5.1.tgz#c20e7a9ca77d147906b6dc2261a8be0a5bd2173c"
-  integrity sha512-OD0TZ+B7yP7ZgpJf5K2DIbj3FZvFvxgFUuaqA/V5zTjAtAAXZ1E8bktHxmAGs4x5b7PflqA9LeQ84Og7wYtF7Q==
+date-fns@2.28.0:
+  version "2.28.0"
+  resolved "https://registry.yarnpkg.com/date-fns/-/date-fns-2.28.0.tgz#9570d656f5fc13143e50c975a3b6bbeb46cd08b2"
+  integrity sha512-8d35hViGYx/QH0icHYCeLmsLmMUheMmTyV9Fcm6gvNwdw31yXXH+O85sOBJ+OLnLQMKZowvpKb6FgMIQjcpvQw==
 
 debug@2, debug@^2.2.0, debug@^2.5.2, debug@^2.6.9:
   version "2.6.9"
diff --git a/packages/client/package.json b/packages/client/package.json
index b840bafe8c..686e0710e5 100644
--- a/packages/client/package.json
+++ b/packages/client/package.json
@@ -12,7 +12,6 @@
 	"dependencies": {
 		"@discordapp/twemoji": "13.1.0",
 		"@syuilo/aiscript": "0.11.1",
-		"@types/dateformat": "3.0.1",
 		"@types/escape-regexp": "0.0.1",
 		"@types/glob": "7.2.0",
 		"@types/gulp": "4.0.9",
diff --git a/packages/client/yarn.lock b/packages/client/yarn.lock
index 76be45f145..88f9027ade 100644
--- a/packages/client/yarn.lock
+++ b/packages/client/yarn.lock
@@ -266,11 +266,6 @@
   resolved "https://registry.yarnpkg.com/@types/color-name/-/color-name-1.1.1.tgz#1c1261bbeaa10a8055bbc5d8ab84b7b2afc846a0"
   integrity sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==
 
-"@types/dateformat@3.0.1":
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/@types/dateformat/-/dateformat-3.0.1.tgz#98d747a2e5e9a56070c6bf14e27bff56204e34cc"
-  integrity sha512-KlPPdikagvL6ELjWsljbyDIPzNCeliYkqRpI+zea99vBBbCIA5JNshZAwQKTON139c87y9qvTFVgkFd14rtS4g==
-
 "@types/escape-regexp@0.0.1":
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/@types/escape-regexp/-/escape-regexp-0.0.1.tgz#f1a977ccdf2ef059e9862bd3af5e92cbbe723e0e"