diff --git a/src/main/java/com/back/domain/study/plan/dto/StudyPlanRequest.java b/src/main/java/com/back/domain/study/plan/dto/StudyPlanRequest.java
index 53935bb8..c7e309ee 100644
--- a/src/main/java/com/back/domain/study/plan/dto/StudyPlanRequest.java
+++ b/src/main/java/com/back/domain/study/plan/dto/StudyPlanRequest.java
@@ -10,26 +10,41 @@
 import lombok.Setter;
 
 import java.time.LocalDateTime;
+import java.time.temporal.ChronoUnit;
 import java.util.ArrayList;
 import java.util.List;
 
 @Getter
 @Setter
 @NoArgsConstructor
-@AllArgsConstructor
 public class StudyPlanRequest {
     private String subject;
 
-    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ss")
     private LocalDateTime startDate;
 
-    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ss")
     private LocalDateTime endDate;
 
     private Color color;
 
     // RepeatRule 중첩 객체
     private RepeatRuleRequest repeatRule;
+    // LocalDateTime을 분 단위로 자르기 위한 setter
+    public void setStartDate(LocalDateTime startDate) {
+        this.startDate = startDate != null ? startDate.truncatedTo(ChronoUnit.MINUTES) : null;
+    }
+    public void setEndDate(LocalDateTime endDate) {
+        this.endDate = endDate != null ? endDate.truncatedTo(ChronoUnit.MINUTES) : null;
+    }
+
+    // 분 단위로 자른 값을 생성자에서도 설정
+    public StudyPlanRequest(String subject, LocalDateTime startDate, LocalDateTime endDate,
+                            Color color, RepeatRuleRequest repeatRule) {
+        this.subject = subject;
+        this.startDate = startDate != null ? startDate.truncatedTo(ChronoUnit.MINUTES) : null;
+        this.endDate = endDate != null ? endDate.truncatedTo(ChronoUnit.MINUTES) : null;
+        this.color = color;
+        this.repeatRule = repeatRule;
+    }
 
     @Getter
     @Setter
diff --git a/src/main/java/com/back/global/exception/GlobalExceptionHandler.java b/src/main/java/com/back/global/exception/GlobalExceptionHandler.java
index c5f7e94f..3d23fa6e 100644
--- a/src/main/java/com/back/global/exception/GlobalExceptionHandler.java
+++ b/src/main/java/com/back/global/exception/GlobalExceptionHandler.java
@@ -34,8 +34,8 @@ public ResponseEntity<RsData<Void>> handleValidationException(MethodArgumentNotV
                 .body(RsData.fail(ErrorCode.BAD_REQUEST));
     }
 
-    // PATH VARIABLE, REQUEST PARAMETER 타입 미스매치 예외 처리
-    // 클라이언트의 데이터 형식이 서버 인자 타입과 안 맞는 경우 예외 (형식 불일치)
+    // PATH VARIABLE, REQUEST PARAMETER의 validation 예외 처리
+    // 클라이언트의 데이터 형식이 서버 인자 형식과 안 맞는 경우 예외 (형식 불일치)
     @ExceptionHandler(MethodArgumentTypeMismatchException.class)
     @ResponseStatus(HttpStatus.BAD_REQUEST)
     public ResponseEntity<RsData<Void>> handleMethodArgumentTypeMismatch(MethodArgumentTypeMismatchException ex) {
diff --git a/src/test/java/com/back/domain/study/plan/controller/StudyPlanControllerTest.java b/src/test/java/com/back/domain/study/plan/controller/StudyPlanControllerTest.java
index e0b577c1..36a4ebd2 100644
--- a/src/test/java/com/back/domain/study/plan/controller/StudyPlanControllerTest.java
+++ b/src/test/java/com/back/domain/study/plan/controller/StudyPlanControllerTest.java
@@ -135,7 +135,7 @@ private StudyPlan createDailyPlan() {
     }
 
     @Test
-    @DisplayName("단발성 계획 생성")
+    @DisplayName("단발성 계획 생성 - 하나에만 밀리초가 들어가도 되는가?!")
     void t1() throws Exception {
 
         ResultActions resultActions = mvc.perform(post("/api/plans")
@@ -144,8 +144,8 @@ void t1() throws Exception {
                         .content("""
                     {
                         "subject": "단발성 계획",
-                        "startDate": "2025-09-26T10:46:00",
-                        "endDate": "2025-09-26T11:46:00",
+                        "startDate": "2025-10-03T17:00:00",
+                        "endDate": "2025-10-03T18:30:00.000",
                         "color": "RED"
                     }
                     """))
@@ -162,8 +162,37 @@ void t1() throws Exception {
                 .andExpect(jsonPath("$.message").value("학습 계획이 성공적으로 생성되었습니다."))
                 .andExpect(jsonPath("$.data.subject").value("단발성 계획"))
                 .andExpect(jsonPath("$.data.color").value("RED"))
-                .andExpect(jsonPath("$.data.startDate").value("2025-09-26T10:46:00"))
-                .andExpect(jsonPath("$.data.endDate").value("2025-09-26T11:46:00"))
+                .andExpect(jsonPath("$.data.startDate").value("2025-10-03T17:00:00"))
+                .andExpect(jsonPath("$.data.endDate").value("2025-10-03T18:30:00"))
+                .andExpect(jsonPath("$.data.repeatRule").doesNotExist());
+
+    }
+
+    @Test
+    @DisplayName("단발성 계획 생성 - 밀리초까지도 둘 다 전송받는 경우")
+    void t1_1() throws Exception {
+
+        ResultActions resultActions = mvc.perform(post("/api/plans")
+                        .header("Authorization", "Bearer faketoken")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content("""
+                    {
+                        "subject": "단발성 계획 - 밀리초 포함",
+                        "startDate": "2025-09-21T05:00:00.000",
+                        "endDate": "2025-09-21T07:00:00.000",
+                        "color": "RED"
+                    }
+                    """))
+                .andDo(print());
+
+        resultActions
+                .andExpect(status().isOk()) // 200 OK인지 확인
+                .andExpect(handler().handlerType(StudyPlanController.class))
+                .andExpect(handler().methodName("createStudyPlan"))
+                .andExpect(jsonPath("$.success").value(true))
+                .andExpect(jsonPath("$.message").value("학습 계획이 성공적으로 생성되었습니다."))
+                .andExpect(jsonPath("$.data.startDate").value("2025-09-21T05:00:00"))
+                .andExpect(jsonPath("$.data.endDate").value("2025-09-21T07:00:00"))
                 .andExpect(jsonPath("$.data.repeatRule").doesNotExist());
 
     }