diff --git a/app/pages/admin/events/create.vue b/app/pages/admin/events/create.vue
index 07267e5..7f910fe 100644
--- a/app/pages/admin/events/create.vue
+++ b/app/pages/admin/events/create.vue
@@ -649,6 +649,16 @@ const eventForm = reactive({
   },
 });
 
+// Format a Date/ISO value into a datetime-local string using local-time components.
+// `toISOString().slice(0,16)` drifts by the browser's UTC offset on edit round-trip.
+const formatForDatetimeLocal = (value) => {
+  if (!value) return "";
+  const d = new Date(value);
+  if (isNaN(d.getTime())) return "";
+  const pad = (n) => String(n).padStart(2, "0");
+  return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}T${pad(d.getHours())}:${pad(d.getMinutes())}`;
+};
+
 // Agenda management functions
 const addAgendaItem = () => {
   eventForm.agenda.push("");
@@ -711,8 +721,8 @@ if (route.query.edit) {
         description: event.description,
         content: event.content || "",
         featureImage: event.featureImage || null,
-        startDate: new Date(event.startDate).toISOString().slice(0, 16),
-        endDate: new Date(event.endDate).toISOString().slice(0, 16),
+        startDate: formatForDatetimeLocal(event.startDate),
+        endDate: formatForDatetimeLocal(event.endDate),
         eventType: event.eventType,
         location: event.location || "",
         isOnline: event.isOnline,
@@ -723,9 +733,7 @@ if (route.query.edit) {
         tags: event.tags || [],
         maxAttendees: event.maxAttendees || "",
         registrationRequired: event.registrationRequired,
-        registrationDeadline: event.registrationDeadline
-          ? new Date(event.registrationDeadline).toISOString().slice(0, 16)
-          : "",
+        registrationDeadline: formatForDatetimeLocal(event.registrationDeadline),
         agenda: event.agenda || [],
         tickets: event.tickets || {
           enabled: false,
@@ -746,13 +754,10 @@ if (route.query.edit) {
           description: "",
         },
       });
-      // Handle early bird deadline formatting
       if (event.tickets?.public?.earlyBirdDeadline) {
-        eventForm.tickets.public.earlyBirdDeadline = new Date(
+        eventForm.tickets.public.earlyBirdDeadline = formatForDatetimeLocal(
           event.tickets.public.earlyBirdDeadline,
-        )
-          .toISOString()
-          .slice(0, 16);
+        );
       }
     }
   } catch (error) {