diff --git a/js/src/components/Event/EventFullDate.vue b/js/src/components/Event/EventFullDate.vue
index 8708993ad..4ca50ee96 100644
--- a/js/src/components/Event/EventFullDate.vue
+++ b/js/src/components/Event/EventFullDate.vue
@@ -169,17 +169,20 @@ export default class EventFullDate extends Vue {
 
   isSameDay(): boolean {
     const sameDay =
-      new Date(this.beginsOn).toDateString() ===
-      new Date(this.endsOn).toDateString();
+      this.beginsOnDate.toDateString() === new Date(this.endsOn).toDateString();
     return this.endsOn !== undefined && sameDay;
   }
 
+  get beginsOnDate(): Date {
+    return new Date(this.beginsOn);
+  }
+
   get differentFromUserTimezone(): boolean {
     return (
       !!this.timezone &&
       !!this.userActualTimezone &&
-      getTimezoneOffset(this.timezone) !==
-        getTimezoneOffset(this.userActualTimezone) &&
+      getTimezoneOffset(this.timezone, this.beginsOnDate) !==
+        getTimezoneOffset(this.userActualTimezone, this.beginsOnDate) &&
       this.timezone !== this.userActualTimezone
     );
   }
diff --git a/js/src/views/Event/Edit.vue b/js/src/views/Event/Edit.vue
index 9fba5a386..3f2295d49 100644
--- a/js/src/views/Event/Edit.vue
+++ b/js/src/views/Event/Edit.vue
@@ -1300,7 +1300,7 @@ export default class EditEvent extends Vue {
   tzOffset(date: Date): number {
     if (this.timezone && date) {
       const eventUTCOffset = getTimezoneOffset(this.timezone, date);
-      const localUTCOffset = getTimezoneOffset(this.userActualTimezone);
+      const localUTCOffset = getTimezoneOffset(this.userActualTimezone, date);
       return (eventUTCOffset - localUTCOffset) / (60 * 1000);
     }
     return 0;