diff --git a/src/features/dashboard/hook/useEmailHook.ts b/src/features/dashboard/hook/useEmailHook.ts
index f8d807ba..ade397c3 100644
--- a/src/features/dashboard/hook/useEmailHook.ts
+++ b/src/features/dashboard/hook/useEmailHook.ts
@@ -34,7 +34,7 @@ export const useSendEmail = () => {
       navigate(`/dashboard/${id}/mailBox`);
     },
     onError: () => {
-      alert('메일 전송에 실패했습니다. 다시 시도해 주세요.');
+      alert(`메일 전송에 실패했습니다. 다시 시도해 주세요.`);
     },
   });
 };
diff --git a/src/features/dashboard/model/store/EmailStore.tsx b/src/features/dashboard/model/store/EmailStore.tsx
index b279d8ca..cd496191 100644
--- a/src/features/dashboard/model/store/EmailStore.tsx
+++ b/src/features/dashboard/model/store/EmailStore.tsx
@@ -5,7 +5,7 @@ interface EmailState {
     title: string;
     content: string;
     recipients: string[];
-    reservationDate: string; // 2025-05-01T14:00:00.000Z
+    reservationDate: string; // 2025-05-01T14:00:00
     targetType: 'ALL' | 'TICKET';
     ticketId: number;
     setReservationEmailId: (reservationEmailId: number) => void;
diff --git a/src/features/event/ui/DatePicker.tsx b/src/features/event/ui/DatePicker.tsx
index f2540174..ef37c313 100644
--- a/src/features/event/ui/DatePicker.tsx
+++ b/src/features/event/ui/DatePicker.tsx
@@ -3,7 +3,7 @@ import DatePicker from 'react-datepicker';
 import { ko } from 'date-fns/locale';
 import 'react-datepicker/dist/react-datepicker.css';
 import { FunnelState } from '../model/FunnelContext';
-import { formatISO } from '../../../shared/lib/date';
+import { formatDateLocalString, extractTimeFromDateString } from '../../../shared/lib/date';
 
 interface DatePickerProps {
   className?: string;
@@ -27,14 +27,30 @@ const EventDatePicker = ({
   isLabel = false,
 }: DatePickerProps) => {
   const [startDate, setStartDate] = useState<Date | null>(
-    eventState?.startDate ? new Date(eventState.startDate) : initialStartDate ? new Date(initialStartDate) : new Date()
+    eventState?.startDate
+      ? new Date(eventState.startDate)
+      : initialStartDate
+        ? new Date(initialStartDate)
+        : new Date()
   );
 
   const [endDate, setEndDate] = useState<Date | null>(
-    eventState?.endDate ? new Date(eventState.endDate) : initialEndDate ? new Date(initialEndDate) : new Date()
+    eventState?.endDate
+      ? new Date(eventState.endDate)
+      : initialEndDate
+        ? new Date(initialEndDate)
+        : new Date()
+  );
+
+  console.log('startDate', startDate);
+  console.log('endDate', endDate);
+
+  const [startTime, setStartTime] = useState<string>(
+    extractTimeFromDateString(eventState?.startDate || initialStartDate, '06:00')
+  );
+  const [endTime, setEndTime] = useState<string>(
+    extractTimeFromDateString(eventState?.endDate || initialEndDate, '23:00')
   );
-  const [startTime, setStartTime] = useState<string>('06:00');
-  const [endTime, setEndTime] = useState<string>('23:00');
 
   useEffect(() => {
     const start = eventState?.startDate || initialStartDate;
@@ -57,6 +73,20 @@ const EventDatePicker = ({
     }
   }, [eventState, initialStartDate, initialEndDate]);
 
+  useEffect(() => {
+    if (eventState?.startDate || initialStartDate) {
+      const date = new Date(eventState?.startDate || initialStartDate!);
+      setStartDate(date);
+      setStartTime(extractTimeFromDateString(eventState?.startDate || initialStartDate, '06:00'));
+    }
+    if (eventState?.endDate || initialEndDate) {
+      const date = new Date(eventState?.endDate || initialEndDate!);
+      setEndDate(date);
+      setEndTime(extractTimeFromDateString(eventState?.endDate || initialEndDate, '23:00'));
+    }
+  }, [eventState?.startDate, eventState?.endDate, initialStartDate, initialEndDate]);
+
+
   const generateTimeOptions = () => {
     const options = [];
     for (let i = 0; i < 24; i++) {
@@ -73,8 +103,8 @@ const EventDatePicker = ({
 
   useEffect(() => {
     if (startDate && endDate) {
-      const startISO = formatISO(startDate, startTime);
-      const endISO = formatISO(endDate, endTime);
+      const startISO = formatDateLocalString(startDate, startTime);
+      const endISO = formatDateLocalString(endDate, endTime);
 
       if (setEventState) {
         setEventState(prev => ({
diff --git a/src/features/event/ui/FileUpload.tsx b/src/features/event/ui/FileUpload.tsx
index 3d926e97..b075ef1c 100644
--- a/src/features/event/ui/FileUpload.tsx
+++ b/src/features/event/ui/FileUpload.tsx
@@ -36,7 +36,7 @@ const FileUpload = ({
   return (
     <div className="flex flex-col justify-start gap-1">
       <h1 className="font-bold text-black text-lg">배너 사진 첨부</h1>
-      <h2 className="text-placeholderText text-xs md:text-sm">1MB 이하의 jpeg, png 파일만 등록할 수 있습니다.</h2>
+      <h2 className="text-placeholderText text-xs md:text-sm">4MB 이하의 jpeg, png 파일만 등록할 수 있습니다.</h2>
       <div
         className={`flex flex-col items-center justify-center h-44 border border-dashed ${
           isDragging ? 'border-main bg-dropdown' : 'border-placeholderText bg-gray3'
diff --git a/src/features/event/ui/TimePicker.tsx b/src/features/event/ui/TimePicker.tsx
index 0ea080c7..42f3b02d 100644
--- a/src/features/event/ui/TimePicker.tsx
+++ b/src/features/event/ui/TimePicker.tsx
@@ -36,13 +36,18 @@ const TimePicker = ({ value, onChange }: TimePickerProps) => {
   useEffect(() => {
     if (selectedDate) {
       const formattedDate = new Date(selectedDate);
-      formattedDate.setHours(parseInt(selectedHour, 10));
-      formattedDate.setMinutes(parseInt(selectedMinute, 10));
-      formattedDate.setSeconds(0);
-      formattedDate.setMilliseconds(0);
+      formattedDate.setHours(Number(selectedHour), Number(selectedMinute), 0, 0);
 
-      const isoString = formattedDate.toISOString(); // 2025-05-01T14:00:00.000Z
-      onChange(isoString);
+      const year = formattedDate.getFullYear();
+      const month = String(formattedDate.getMonth() + 1).padStart(2, '0');
+      const day = String(formattedDate.getDate()).padStart(2, '0');
+      const hour = String(formattedDate.getHours()).padStart(2, '0');
+      const minute = String(formattedDate.getMinutes()).padStart(2, '0');
+
+      const localString = `${year}-${month}-${day}T${hour}:${minute}:00`;
+
+      onChange(localString);
+      console.log(localString);
     }
   }, [selectedDate, selectedHour, selectedMinute]);
 
diff --git a/src/features/ticket/ui/TicketDatePicker.tsx b/src/features/ticket/ui/TicketDatePicker.tsx
index a630e14a..858d6000 100644
--- a/src/features/ticket/ui/TicketDatePicker.tsx
+++ b/src/features/ticket/ui/TicketDatePicker.tsx
@@ -3,7 +3,7 @@ import DatePicker from 'react-datepicker';
 import { ko } from 'date-fns/locale';
 import 'react-datepicker/dist/react-datepicker.css';
 import { TicketState } from '../model/TicketContext';
-import { formatISO } from '../../../shared/lib/date';
+import { formatDateLocalString } from '../../../shared/lib/date';
 
 interface DatePickerProps {
   className?: string;
@@ -44,8 +44,8 @@ const TicketDatePicker = ({
   const timeOptions = generateTimeOptions();
 
   useEffect(() => {
-    const newStartDate = startDate ? formatISO(startDate, startTime) : '';
-    const newEndDate = endDate ? formatISO(endDate, endTime) : '';
+    const newStartDate = startDate ? formatDateLocalString(startDate, startTime) : '';
+    const newEndDate = endDate ? formatDateLocalString(endDate, endTime) : '';
 
     if (setTicketState) {
       setTicketState(prev => ({
diff --git a/src/pages/dashboard/ui/EventInfoPage.tsx b/src/pages/dashboard/ui/EventInfoPage.tsx
index 0771444b..d72b1c83 100644
--- a/src/pages/dashboard/ui/EventInfoPage.tsx
+++ b/src/pages/dashboard/ui/EventInfoPage.tsx
@@ -12,12 +12,14 @@ import KakaoMap from '../../../shared/ui/KakaoMap';
 import { UpdateEventRequest } from '../../../features/dashboard/model/event';
 import { useEventDetail } from '../../../entities/event/hook/useEventHook';
 import { formatPhoneNumber } from '../../../shared/utils/phoneFormatter';
+import { useNavigate } from 'react-router-dom';
 
 const EventInfoPage = () => {
   const queryClient = useQueryClient();
   const [selectedOption, setSelectedOption] = useState('');
   const { data } = useEventDetail();
   const { mutate } = useUpdateEventHook();
+  const navigate = useNavigate();
 
   const handleSelect = (option: string) => {
     setSelectedOption(option);
@@ -62,6 +64,7 @@ const EventInfoPage = () => {
       onSuccess: () => {
         alert('이벤트 정보가 저장되었습니다.');
         queryClient.invalidateQueries({ queryKey: ['eventDetail', data.result.id] });
+        navigate(`/dashboard/${data?.result.id}`);
       },
       onError: error => {
         console.error('Error details:', error);
diff --git a/src/pages/event/ui/create-event/EventInfoPage.tsx b/src/pages/event/ui/create-event/EventInfoPage.tsx
index af5c17ef..73c16675 100644
--- a/src/pages/event/ui/create-event/EventInfoPage.tsx
+++ b/src/pages/event/ui/create-event/EventInfoPage.tsx
@@ -28,12 +28,18 @@ const EventInfoPage = ({ onValidationChange }: EventInfoPageProps) => {
   return (
     <div className="w-full px-5 space-y-8">
       <FileUpload
+        value={eventState?.bannerImageUrl ?? ''}
         eventState={eventState}
         setEventState={setEventState}
         useDefaultImage={false}
         onValidationChange={handleFileValidation}
       />
-      <TextEditor eventState={eventState} setEventState={setEventState} onValidationChange={handleTextValidation} />
+      <TextEditor 
+        value={eventState?.description ?? ''}
+        eventState={eventState}
+        setEventState={setEventState}
+        onValidationChange={handleTextValidation}
+      />
       <LinkInput eventState={eventState} setEventState={setEventState} />
     </div>
   );
diff --git a/src/pages/join/LogoutPage.tsx b/src/pages/join/LogoutPage.tsx
index de7d5371..403409d7 100644
--- a/src/pages/join/LogoutPage.tsx
+++ b/src/pages/join/LogoutPage.tsx
@@ -22,7 +22,8 @@ const LogoutPage = () => {
           'code' in error &&
           (
             (error as { code?: string }).code === 'TOKEN4001' ||
-            (error as { code?: string }).code === 'TOKEN4004')
+            (error as { code?: string }).code === 'TOKEN4004'
+          )
         ) {
           // 토큰 만료로 인한 자동 로그아웃이므로 조용히 처리
           console.log('토큰 만료로 인한 자동 로그아웃', error);
diff --git a/src/shared/lib/date.ts b/src/shared/lib/date.ts
index b54f1bd2..a47ce7d2 100644
--- a/src/shared/lib/date.ts
+++ b/src/shared/lib/date.ts
@@ -21,6 +21,29 @@ export const formatISO = (date: Date, time: string): string => {
   const kstDate = new Date(newDate.getTime() + 9 * 60 * 60 * 1000); // UTC+9
   return kstDate.toISOString();
 };
+
+export const extractTimeFromDateString = (dateString?: string, defaultTime = '06:00') => {
+  if (!dateString) return defaultTime;
+  const date = new Date(dateString);
+  const hours = date.getHours().toString().padStart(2, '0');
+  const minutes = date.getMinutes().toString().padStart(2, '0');
+  return `${hours}:${minutes}`;
+}
+
+export const formatDateLocalString = (date: Date, time: string): string => {
+  const [hours, minutes] = time.split(':').map(Number);
+  const newDate = new Date(date);
+  newDate.setHours(hours, minutes, 0, 0);
+
+  const year = newDate.getFullYear();
+  const month = String(newDate.getMonth() + 1).padStart(2, '0');
+  const day = String(newDate.getDate()).padStart(2, '0');
+  const hour = String(newDate.getHours()).padStart(2, '0');
+  const minute = String(newDate.getMinutes()).padStart(2, '0');
+
+  return `${year}-${month}-${day}T${hour}:${minute}:00`;
+};
+
 export const formatUtcToKst = (utcString: string): string => {
   const utcDate = new Date(utcString);
 
@@ -35,4 +58,3 @@ export const formatUtcToKst = (utcString: string): string => {
 
   return `${year}년 ${month}월 ${day}일 ${hours}:${minutes}`;
 };
-
diff --git a/src/shared/ui/EventCard.tsx b/src/shared/ui/EventCard.tsx
index ee39e4a1..33f9885b 100644
--- a/src/shared/ui/EventCard.tsx
+++ b/src/shared/ui/EventCard.tsx
@@ -133,8 +133,17 @@ const EventCard = ({
                       onDeleteSuccess?.(id);
                       setIsModalOpen(false);
                     },
-                    onError: () => {
-                      alert('이벤트 삭제에 실패했습니다.');
+                    onError: (error: unknown) => {
+                      if ( 
+                        typeof error === 'object' && 
+                        error !== null && 
+                        'code' in error && 
+                        (
+                          error as { code? : string}).code === "EVENT4002"
+                        ) {
+                        console.log('참여자로 인한 이벤트 삭제 실패');
+                        alert('구매자가 있는 이벤트는 삭제가 불가합니다.');
+                      }
                       setIsModalOpen(false);
                     },
                   });