diff --git a/src/main/java/com/keunsori/keunsoriserver/domain/admin/reservation/dto/request/WeeklyScheduleUpdateRequest.java b/src/main/java/com/keunsori/keunsoriserver/domain/admin/reservation/dto/request/WeeklyScheduleUpdateRequest.java
index e4f9100..84da2cd 100644
--- a/src/main/java/com/keunsori/keunsoriserver/domain/admin/reservation/dto/request/WeeklyScheduleUpdateRequest.java
+++ b/src/main/java/com/keunsori/keunsoriserver/domain/admin/reservation/dto/request/WeeklyScheduleUpdateRequest.java
@@ -1,6 +1,7 @@
 package com.keunsori.keunsoriserver.domain.admin.reservation.dto.request;
 
 import com.keunsori.keunsoriserver.domain.admin.reservation.domain.WeeklySchedule;
+import com.keunsori.keunsoriserver.global.util.DayOfWeekUtil;
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.validation.constraints.Max;
 import jakarta.validation.constraints.Min;
@@ -21,16 +22,11 @@ public record WeeklyScheduleUpdateRequest(
 ) {
         public WeeklySchedule toEntity(){
                 return WeeklySchedule.builder()
-                        .dayOfWeek(DayOfWeek.of((convertToDowValue(dayOfWeekNum))))
+                        .dayOfWeek(DayOfWeekUtil.fromCustomValue(dayOfWeekNum))
                         .isActive(isActive)
                         .startTime(startTime)
                         .endTime(endTime)
                         .build();
         }
-
-        private int convertToDowValue(int dayOfWeekNum){
-                if(dayOfWeekNum == 0) dayOfWeekNum = 7;
-                return dayOfWeekNum;
-        }
 }
 
diff --git a/src/main/java/com/keunsori/keunsoriserver/domain/admin/reservation/dto/response/WeeklyScheduleResponse.java b/src/main/java/com/keunsori/keunsoriserver/domain/admin/reservation/dto/response/WeeklyScheduleResponse.java
index 5551c8a..97a557c 100644
--- a/src/main/java/com/keunsori/keunsoriserver/domain/admin/reservation/dto/response/WeeklyScheduleResponse.java
+++ b/src/main/java/com/keunsori/keunsoriserver/domain/admin/reservation/dto/response/WeeklyScheduleResponse.java
@@ -1,6 +1,7 @@
 package com.keunsori.keunsoriserver.domain.admin.reservation.dto.response;
 
 import com.keunsori.keunsoriserver.domain.admin.reservation.domain.WeeklySchedule;
+import com.keunsori.keunsoriserver.global.util.DayOfWeekUtil;
 
 import java.time.LocalTime;
 
@@ -12,7 +13,7 @@ public record WeeklyScheduleResponse(
 ) {
     public static WeeklyScheduleResponse from(WeeklySchedule weeklySchedule){
         return new WeeklyScheduleResponse(
-                weeklySchedule.getDayOfWeek().getValue()%7,
+                DayOfWeekUtil.getCustomValue(weeklySchedule.getDayOfWeek()),
                 weeklySchedule.isActive(),
                 weeklySchedule.getStartTime(),
                 weeklySchedule.getEndTime()
diff --git a/src/main/java/com/keunsori/keunsoriserver/global/util/DayOfWeekUtil.java b/src/main/java/com/keunsori/keunsoriserver/global/util/DayOfWeekUtil.java
new file mode 100644
index 0000000..77bbff6
--- /dev/null
+++ b/src/main/java/com/keunsori/keunsoriserver/global/util/DayOfWeekUtil.java
@@ -0,0 +1,13 @@
+package com.keunsori.keunsoriserver.global.util;
+
+import java.time.DayOfWeek;
+
+public class DayOfWeekUtil {
+    public static int getCustomValue(DayOfWeek dayOfWeek){
+        return dayOfWeek.getValue() % 7;
+    }
+
+    public static DayOfWeek fromCustomValue(int customValue){
+        return DayOfWeek.of((customValue == 0) ? 7 : customValue);
+    }
+}