diff --git a/BE/src/auth/auth.controller.ts b/BE/src/auth/auth.controller.ts
index b7f3df0..0e4ceb3 100644
--- a/BE/src/auth/auth.controller.ts
+++ b/BE/src/auth/auth.controller.ts
@@ -134,4 +134,25 @@ export class AuthController {
       ),
     };
   }
+
+  @Patch('timezone')
+  @UseGuards(AccessTokenGuard)
+  @ApiOperation({ summary: '유저 타임존 설정 (완)' })
+  @ApiResponse({ status: 200, description: '타임존 설정 성공' })
+  @ApiResponse({ status: 400, description: '잘못된 요청' })
+  @ApiResponse({ status: 401, description: '인증 실패' })
+  @ApiBearerAuth()
+  async patchTimezone(
+    @User('id') user_id: number,
+    @Body('timezone') timezone: string,
+  ): Promise<any> {
+    const updatedUser = await this.usersService.updateTimezone(
+      user_id,
+      timezone,
+    );
+    return {
+      statusCode: 200,
+      message: '타임존 설정 성공',
+    };
+  }
 }
diff --git a/BE/src/mates/mates.controller.ts b/BE/src/mates/mates.controller.ts
index 9eedbd4..fccc8e3 100644
--- a/BE/src/mates/mates.controller.ts
+++ b/BE/src/mates/mates.controller.ts
@@ -33,15 +33,21 @@ export class MatesController {
   @ApiCreatedResponse({
     description: 'OK',
   })
-  @ApiQuery({
-    name: 'date',
-    example: '2023-11-22',
-    description: '날짜',
+  @ApiBody({
+    schema: {
+      properties: {
+        date: {
+          type: 'datetime',
+          example: '2023-11-22T14:00:00+09:00',
+          description: '날짜',
+        },
+      },
+    },
   })
   @ApiOperation({ summary: '모든 친구들 조회하기 (완)' })
   getMates(
     @User('id') user_id: number,
-    @Query('date') date: string,
+    @Body('date') date: string,
   ): Promise<object> {
     return this.matesService.getMates(user_id, date);
   }
diff --git a/BE/src/mates/mates.service.ts b/BE/src/mates/mates.service.ts
index 600e36d..7a44b0c 100644
--- a/BE/src/mates/mates.service.ts
+++ b/BE/src/mates/mates.service.ts
@@ -54,17 +54,23 @@ export class MatesService {
   }
 
   async getMates(user_id: number, date: string): Promise<object[]> {
+    const offset = date.split(/\d\d:\d\d:\d\d/)[1];
+
+    const nowUserTime = moment(date)
+      .utcOffset(offset)
+      .format('YYYY-MM-DD HH:mm:ss');
+
     const studyTimeByFollowing = await this.userRepository.query(
       `
         SELECT u.id, u.nickname, u.image_url, COALESCE(SUM(s.learning_time), 0) AS total_time
         FROM users_model u
         LEFT JOIN mates m ON m.following_id = u.id
-        LEFT JOIN study_logs s ON s.user_id = u.id AND s.date = ?
+        LEFT JOIN study_logs s ON s.user_id = u.id AND s.date = DATE(CONVERT_TZ(?, ?, u.timezone))
         WHERE m.follower_id = ? 
         GROUP BY u.id
         ORDER BY total_time DESC
       `,
-      [date, user_id],
+      [nowUserTime, offset, user_id],
     );
     return Promise.all(
       studyTimeByFollowing.map(async (record) => {
diff --git a/BE/src/users/entity/users.entity.ts b/BE/src/users/entity/users.entity.ts
index 86bd31b..3753e0a 100644
--- a/BE/src/users/entity/users.entity.ts
+++ b/BE/src/users/entity/users.entity.ts
@@ -52,6 +52,13 @@ export class UsersModel {
   })
   auth_type: AuthTypeEnum;
 
+  @Column({
+    type: 'char',
+    default: '+09:00',
+    length: 6,
+  })
+  timezone: string;
+
   @OneToMany(() => StudyLogs, (studyLog) => studyLog.user_id)
   study_logs: StudyLogs[];
 
diff --git a/BE/src/users/users.service.ts b/BE/src/users/users.service.ts
index f4092e6..abc3d4a 100644
--- a/BE/src/users/users.service.ts
+++ b/BE/src/users/users.service.ts
@@ -79,6 +79,15 @@ export class UsersService {
     }
   }
 
+  async updateTimezone(user_id: number, timezone: string): Promise<UsersModel> {
+    const selectedUser = await this.usersRepository.findOne({
+      where: { id: user_id },
+    });
+    selectedUser.timezone = timezone;
+    const updatedUser = await this.usersRepository.save(selectedUser);
+    return updatedUser;
+  }
+
   async isUniqueNickname(nickname: string): Promise<object> {
     const isDuplicated = await this.usersRepository.exist({
       where: { nickname },