diff --git a/src/components/ganttchart/ganttChart.config.js b/src/components/ganttchart/ganttChart.config.js
index 59ffbe8..283f711 100644
--- a/src/components/ganttchart/ganttChart.config.js
+++ b/src/components/ganttchart/ganttChart.config.js
@@ -1,11 +1,11 @@
 export const scales = [
-    { unit: "month", step: 1, format: "Y년 M" },
+    { unit: "month", step: 1, format: "Y년 M월" },
     { unit: "day", step: 1, format: "d일" },
 ];
 
 export const columns = [
     { id: "text", header: "작업명", flexGrow: 1, align: "center"},
-    { id: "start", header: "마감일", flexGrow: 1, align: "center" },
+    { id: "start", header: "시작일", flexGrow: 1, align: "center" },
     // { id: "action", header: "", width: 50, align: "center" },
 ];
 
@@ -40,8 +40,7 @@ export const calculateDuration = (start, end) => {
     const startDate = new Date(start);
     const endDate = new Date(end);
     startDate.setHours(0, 0, 0, 0);
-    endDate.setHours(0, 0, 0, 0);
+    endDate.setHours(23, 59, 59, 59);
     const diffTime = Math.abs(endDate - startDate);
-    const diffDays = Math.ceil(diffTime / (1000 * 60 * 60 * 24));
-    return diffDays + 1;
+    return Math.ceil(diffTime / (1000 * 60 * 60 * 24));
 };
diff --git a/src/components/kanban/Kanban.jsx b/src/components/kanban/Kanban.jsx
index 5be84e1..41be9db 100644
--- a/src/components/kanban/Kanban.jsx
+++ b/src/components/kanban/Kanban.jsx
@@ -52,10 +52,12 @@ function Kanban({ projectId, members = [] }) {
   };
 
   const handleAddNewCard = (columnId) => {
-    // 새 이슈에 대한 기본 날짜 정보를 추가합니다.
     const startDate = new Date();
+    startDate.setHours(0, 0, 0, 0); // 00시 00분 00초 000밀리초
+
     const endDate = new Date();
-    endDate.setDate(startDate.getDate() + 1); // 기본 마감일은 다음 날로 설정
+    endDate.setDate(startDate.getDate() + 1); // 다음 날로 설정
+    endDate.setHours(23, 59, 59, 999); // 23시 59분 59초 999밀리초
 
     const newIssueData = {
       title: "새로운 작업",
diff --git a/src/components/kanban/KanbanCard.jsx b/src/components/kanban/KanbanCard.jsx
index 4c8b1dc..39fdac4 100644
--- a/src/components/kanban/KanbanCard.jsx
+++ b/src/components/kanban/KanbanCard.jsx
@@ -33,21 +33,26 @@ function KanbanCard({ item, index, onCardClick, onDelete }) {
   };
 
   const formatDate = (dateString) => {
-    const date = new Date(dateString)
-    const today = new Date()
-    const diffTime = date - today
-    const diffDays = Math.ceil(diffTime / (1000 * 60 * 60 * 24))
+    const date = new Date(dateString);
+    const today = new Date();
+
+    // 시간 정규화
+    date.setHours(23, 59, 59, 999); // 대상 날짜는 하루 끝으로
+    today.setHours(0, 0, 0, 0);     // 오늘은 하루 시작으로
+
+    const diffTime = date - today;
+    const diffDays = Math.floor(diffTime / (1000 * 60 * 60 * 24));
 
     if (diffDays < 0) {
-      return `${Math.abs(diffDays)}일 지남`
+      return `${Math.abs(diffDays)}일 지남`;
     } else if (diffDays === 0) {
-      return '오늘'
+      return '오늘';
     } else if (diffDays === 1) {
-      return '내일'
+      return '내일';
     } else {
-      return `${diffDays}일 남음`
+      return `${diffDays}일 남음`;
     }
-  }
+  };
 
   return (
     <Draggable draggableId={item.id.toString()} index={index}>
diff --git a/src/components/project/ProjectFilters.jsx b/src/components/project/ProjectFilters.jsx
index 8405e2d..1bba342 100644
--- a/src/components/project/ProjectFilters.jsx
+++ b/src/components/project/ProjectFilters.jsx
@@ -27,11 +27,10 @@ function ProjectFilters({ filters, onFiltersChange, sortBy, onSortChange }) {
   ];
 
   const sortOptions = [
-    { value: "created", label: "생성일순" },
-    { value: "name", label: "이름순" },
-    { value: "progress", label: "진행률순" },
-    { value: "endDate", label: "마감일순" },
-    { value: "priority", label: "우선순위순" }
+    { value: "CREATED_AT", label: "생성일순" },
+    { value: "NAME", label: "이름순" },
+    { value: "END_DATE", label: "마감일순" },
+    { value: "PRIORITY", label: "우선순위순" }
   ];
 
   return (
@@ -77,7 +76,7 @@ function ProjectFilters({ filters, onFiltersChange, sortBy, onSortChange }) {
         </div>
 
         {/* 필터 초기화 */}
-        {(filters.status !== 'all' || filters.priority !== 'all' || filters.assignee !== 'all' || filters.period !== 'all') && (
+        {(filters.status !== 'all' || filters.priority !== 'all') && (
           <button
             onClick={() => onFiltersChange({
               status: 'all',
diff --git a/src/pages/ProjectManager.jsx b/src/pages/ProjectManager.jsx
index ccb2120..0d5e93c 100644
--- a/src/pages/ProjectManager.jsx
+++ b/src/pages/ProjectManager.jsx
@@ -24,7 +24,7 @@ function ProjectManager() {
   const [viewType, setViewType] = useState('card');
   const [searchTerm, setSearchTerm] = useState('');
   const [filters, setFilters] = useState({ status: 'all', priority: 'all' });
-  const [sortBy, setSortBy] = useState('created');
+  const [sortBy, setSortBy] = useState('CREATED_AT');
   const [isCreateModalOpen, setIsCreateModalOpen] = useState(false);
   const [selectedProject, setSelectedProject] = useState(null);
 
@@ -32,7 +32,7 @@ function ProjectManager() {
     search: searchTerm,
     status: filters.status === 'all' ? null : statusMap[filters.status],
     priority: filters.priority === 'all' ? null : priorityMap[filters.priority],
-    sort: sortBy,
+    sortBy: sortBy,
   }), [searchTerm, filters, sortBy]);
 
   const { data: projectData, isLoading: projectsLoading, isError: projectsError } = useProjects(apiFilters);