diff --git a/backend/src/db/migrations/20231017141022-fix-event-dates.ts b/backend/src/db/migrations/20231017141022-fix-event-dates.ts
index b7e23479c..3c4302f13 100644
--- a/backend/src/db/migrations/20231017141022-fix-event-dates.ts
+++ b/backend/src/db/migrations/20231017141022-fix-event-dates.ts
@@ -19,11 +19,11 @@ export async function up(next) {
     for (const event of events.records) {
       let [id, eventStart, eventEnd] = event
       let date = new Date(eventStart)
-      date.setHours(date.getHours() - 2)
+      date.setHours(date.getHours() - 1)
       eventStart = date.toISOString()
       if (eventEnd) {
         date = new Date(eventEnd)
-        date.setHours(date.getHours() - 2)
+        date.setHours(date.getHours() - 1)
         eventEnd = date.toISOString()
       }
       await transaction.run(`
diff --git a/backend/src/schema/resolvers/helpers/events.ts b/backend/src/schema/resolvers/helpers/events.ts
index 835088d8c..d4fc1fb11 100644
--- a/backend/src/schema/resolvers/helpers/events.ts
+++ b/backend/src/schema/resolvers/helpers/events.ts
@@ -34,6 +34,8 @@ const validateEventDate = (dateString) => {
   const date = new Date(dateString)
   if (date.toString() === 'Invalid Date')
     throw new UserInputError('Event start date must be a valid date!')
+  if (date.toISOString() !== dateString)
+    throw new UserInputError('Event start date must be in ISO format!')
   const now = new Date()
   if (date.getTime() < now.getTime()) {
     throw new UserInputError('Event start date must be in the future!')
@@ -44,6 +46,8 @@ const validateEventEnd = (start, end) => {
   const endDate = new Date(end)
   if (endDate.toString() === 'Invalid Date')
     throw new UserInputError('Event end date must be a valid date!')
+  if (endDate.toISOString() !== end)
+    throw new UserInputError('Event end date must be in ISO format!')
   const startDate = new Date(start)
   if (endDate < startDate)
     throw new UserInputError('Event end date must be a after event start date!')