diff --git a/frontend/src/pages/uiws/ScheduleCalendar.tsx b/frontend/src/pages/uiws/ScheduleCalendar.tsx
index 5a03426..f9abbab 100644
--- a/frontend/src/pages/uiws/ScheduleCalendar.tsx
+++ b/frontend/src/pages/uiws/ScheduleCalendar.tsx
@@ -84,16 +84,22 @@ export default function ScheduleCalendar() {
   )
 }
 
+// datetime-local(yyyy-MM-ddTHH:mm) → API 계약(yyyy-MM-ddTHH:mm:ss) 보정: 초 없으면 :00 부가
+function toApiDt(v: string): string {
+  if (!v) return v
+  return v.length === 16 ? `${v}:00` : v
+}
+
 function ScheduleForm({ date, type, onClose, onSaved }: { date: string; type: string; onClose: () => void; onSaved: () => void }) {
   const [title, setTitle] = useState('')
-  const [startDt, setStartDt] = useState(`${date}T09:00:00`)
-  const [endDt, setEndDt] = useState(`${date}T18:00:00`)
+  const [startDt, setStartDt] = useState(`${date}T09:00`)
+  const [endDt, setEndDt] = useState(`${date}T18:00`)
   const [content, setContent] = useState('')
   const [err, setErr] = useState('')
   const save = async () => {
     setErr('')
     try {
-      await createSchedule({ scheType: type, title, startDt, endDt, content, attachmentIds: [] })
+      await createSchedule({ scheType: type, title, startDt: toApiDt(startDt), endDt: toApiDt(endDt), content, attachmentIds: [] })
       onSaved()
     } catch (e: any) { setErr(e?.response?.data?.message || '저장 실패') }
   }
@@ -101,8 +107,8 @@ function ScheduleForm({ date, type, onClose, onSaved }: { date: string; type: st
     <Modal title="일정 등록" onClose={onClose}
       footer={<><Button variant="ghost" onClick={onClose}>취소</Button><Button onClick={save}>저장</Button></>}>
       <FormField label="제목"><Input value={title} onChange={setTitle} style={{ width: '100%' }} /></FormField>
-      <FormField label="시작(yyyy-MM-ddTHH:mm:ss)"><Input value={startDt} onChange={setStartDt} style={{ width: '100%' }} /></FormField>
-      <FormField label="종료"><Input value={endDt} onChange={setEndDt} style={{ width: '100%' }} /></FormField>
+      <FormField label="시작"><Input type="datetime-local" value={startDt} onChange={setStartDt} style={{ width: '100%' }} /></FormField>
+      <FormField label="종료"><Input type="datetime-local" value={endDt} onChange={setEndDt} style={{ width: '100%' }} /></FormField>
       <FormField label="내용"><Input value={content} onChange={setContent} style={{ width: '100%' }} /></FormField>
       {err && <div style={{ color: 'var(--uiws-danger)', fontSize: 13 }}>{err}</div>}
     </Modal>