diff --git a/src/lib/datetime.ts b/src/lib/datetime.ts
index 35db356..dd8e126 100644
--- a/src/lib/datetime.ts
+++ b/src/lib/datetime.ts
@@ -108,6 +108,16 @@ export const pprintDateRange = (d1: string | Date | Dayjs, d2: string | Date | D
     }
 }
 
+/**
+ * Format a datetime for Excel export.
+ * The date is formatted as "YYYY-MM-DD HH:mm:ss".
+ * @param date - The date string to format.
+ * @return {string} The formatted date.
+ */
+export function formatDateForExcel(date: string | Date | Dayjs): string {
+    return dayjs(date).format('YYYY-MM-DD HH:mm:ss');
+}
+
 /**
  * Format the duration between two dates.
  * The Duration is precise to the minute.
diff --git a/src/pages/events/e/:eventId/EventLists/Search/DownloadDataModal.tsx b/src/pages/events/e/:eventId/EventLists/Search/DownloadDataModal.tsx
index cc898a9..76f4e39 100644
--- a/src/pages/events/e/:eventId/EventLists/Search/DownloadDataModal.tsx
+++ b/src/pages/events/e/:eventId/EventLists/Search/DownloadDataModal.tsx
@@ -12,6 +12,7 @@ import {onlyUnique} from "@/lib/util.ts";
 import {CSV_CHARSETS, downloadCsv} from "@/lib/csv.ts";
 import {showSuccessNotification} from "@/components/util.tsx";
 import {PocketBaseErrorAlert} from "@/lib/pocketbase.tsx";
+import {formatDateForExcel} from "@/lib/datetime.ts";
 
 type FormValues = {
     questionSchemaFields: string[]
@@ -121,7 +122,7 @@ export default function DownloadDataModal({opened, onClose, lists, event, query}
                     const statusData = e.entryStatusData || {}
                     return [
                         ...(showDebug ? [e.user, e.id] : []),
-                        e.expand?.user.username ?? "N/A", e.created, e.listName, e.slotStartDate, e.slotEndDate,
+                        e.expand?.user.username ?? "N/A", formatDateForExcel(e.created), e.listName, formatDateForExcel(e.slotStartDate), formatDateForExcel(e.slotEndDate),
                         ...questionSchema.fields.map(f => questionData[f.id]?.value?.toString() ?? "N/A").map(escapeSeparator),
                         ...statusSchema.fields.map(f => statusData[f.id]?.value?.toString() ?? "N/A").map(escapeSeparator)
                     ]