diff --git a/dictation_server/src/features/licenses/types/types.ts b/dictation_server/src/features/licenses/types/types.ts
index d5e2fce..e0fce77 100644
--- a/dictation_server/src/features/licenses/types/types.ts
+++ b/dictation_server/src/features/licenses/types/types.ts
@@ -3,6 +3,7 @@ import { IsInt, Matches, Max, Min, Length } from 'class-validator';
 import {
   LICENSE_EXPIRATION_DAYS,
   LICENSE_EXPIRATION_THRESHOLD_DAYS,
+  TRIAL_LICENSE_EXPIRATION_DAYS,
 } from '../../../constants';
 
 export class CreateOrdersRequest {
@@ -79,6 +80,20 @@ export class ExpirationThresholdDate extends Date {
   }
 }
 
+// 新規トライアルライセンス発行時の有効期限算出用に、30日後の日付を取得する
+export class NewTrialLicenseExpirationDate extends Date {
+  constructor(...args: any[]) {
+    if (args.length === 0) {
+      super(); // 引数がない場合、現在の日付で初期化
+    } else {
+      super(...(args as [string])); // 引数がある場合、引数をそのままDateクラスのコンストラクタに渡す
+    }
+    this.setDate(this.getDate() + TRIAL_LICENSE_EXPIRATION_DAYS);
+    this.setHours(23, 59, 59); // 時分秒を"23:59:59"に固定
+    this.setMilliseconds(0);
+  }
+}
+
 // 新規ライセンス割り当て時の有効期限算出用に、365日後の日付を取得する
 export class NewAllocatedLicenseExpirationDate extends Date {
   constructor(...args: any[]) {
diff --git a/dictation_server/src/features/users/users.service.spec.ts b/dictation_server/src/features/users/users.service.spec.ts
index 609dabe..1c2ee84 100644
--- a/dictation_server/src/features/users/users.service.spec.ts
+++ b/dictation_server/src/features/users/users.service.spec.ts
@@ -28,7 +28,6 @@ import {
   LICENSE_ALLOCATED_STATUS,
   LICENSE_EXPIRATION_THRESHOLD_DAYS,
   LICENSE_TYPE,
-  TRIAL_LICENSE_EXPIRATION_DAYS,
   USER_LICENSE_STATUS,
   USER_ROLES,
 } from '../../constants';
@@ -39,7 +38,7 @@ import {
   overrideSendgridService,
   overrideUsersRepositoryService,
 } from '../../common/test/overrides';
-import { ExpirationThresholdDate } from '../licenses/types/types';
+import { NewTrialLicenseExpirationDate } from '../licenses/types/types';
 import { License } from '../../repositories/licenses/entity/license.entity';
 
 describe('UsersService.confirmUser', () => {
@@ -93,11 +92,9 @@ describe('UsersService.confirmUser', () => {
     //result
     const resultUser = await getUser(source, userId);
     const resultLicenses = await getLicenses(source, accountId);
-    const today = new Date();
+
     // トライアルライセンスは有効期限は今日を起算日として30日後の日付が変わるまで
-    const expiryDate = new ExpirationThresholdDate(
-      today.setDate(today.getDate() + TRIAL_LICENSE_EXPIRATION_DAYS),
-    );
+    const expiryDate = new NewTrialLicenseExpirationDate();
     const resultLicensesCheckParam: Omit<
       License,
       'deleted_at' | 'created_by' | 'created_at' | 'updated_at' | 'updated_by'
diff --git a/dictation_server/src/repositories/users/users.repository.service.ts b/dictation_server/src/repositories/users/users.repository.service.ts
index d27fe3e..2dce6a3 100644
--- a/dictation_server/src/repositories/users/users.repository.service.ts
+++ b/dictation_server/src/repositories/users/users.repository.service.ts
@@ -16,12 +16,11 @@ import {
 import {
   LICENSE_ALLOCATED_STATUS,
   LICENSE_TYPE,
-  TRIAL_LICENSE_EXPIRATION_DAYS,
   TRIAL_LICENSE_ISSUE_NUM,
   USER_ROLES,
 } from '../../constants';
 import { License } from '../licenses/entity/license.entity';
-import { ExpirationThresholdDate } from '../../features/licenses/types/types';
+import { NewTrialLicenseExpirationDate } from '../../features/licenses/types/types';
 
 @Injectable()
 export class UsersRepositoryService {
@@ -301,11 +300,10 @@ export class UsersRepositoryService {
       // トライアルライセンス100件を作成する
       const licenseRepo = entityManager.getRepository(License);
       const licenses: License[] = [];
-      const today = new Date();
+
       // トライアルライセンスの有効期限は今日を起算日として30日後の日付が変わるまで
-      const expiryDate = new ExpirationThresholdDate(
-        today.setDate(today.getDate() + TRIAL_LICENSE_EXPIRATION_DAYS),
-      );
+      const expiryDate = new NewTrialLicenseExpirationDate();
+
       for (let i = 0; i < TRIAL_LICENSE_ISSUE_NUM; i++) {
         const license = new License();
         license.expiry_date = expiryDate;