diff --git a/src/app/data/scheduledevent.service.ts b/src/app/data/scheduledevent.service.ts
index f41f8264..8f4c6dd8 100644
--- a/src/app/data/scheduledevent.service.ts
+++ b/src/app/data/scheduledevent.service.ts
@@ -139,6 +139,16 @@ export class ScheduledeventService extends ListableResourceClient<ScheduledEvent
         const se = JSON.parse(atou(s.content));
         return of(se);
       }),
+      map((otac: OTAC[]) => {
+        otac.map((iOTAC: OTAC) => {
+          if (iOTAC.redeemed_timestamp) {
+            iOTAC.redeemed_timestamp = new Date(iOTAC.redeemed_timestamp);
+          } else {
+            iOTAC.redeemed_timestamp = undefined;
+          }
+        });
+        return otac;
+      }),
     );
   }
 
diff --git a/src/app/event/otacmanagement/otacmanagement.component.ts b/src/app/event/otacmanagement/otacmanagement.component.ts
index 40c28b61..615f6fd2 100644
--- a/src/app/event/otacmanagement/otacmanagement.component.ts
+++ b/src/app/event/otacmanagement/otacmanagement.component.ts
@@ -158,8 +158,13 @@ export class OTACManagementComponent implements OnInit, OnDestroy {
       if (otacUser) {
         userCSVpart = `${otacUser}, ${this.getUsername(otacUser)}`;
       }
+      const redeemedStr = otac.redeemed_timestamp
+        ? otac.redeemed_timestamp instanceof Date
+          ? otac.redeemed_timestamp.toISOString()
+          : otac.redeemed_timestamp
+        : '';
       otacCSV = otacCSV.concat(
-        `${otac.name}, ${userCSVpart || ''}, ${otac.redeemed_timestamp?.toISOString() || ''}, ${otac.max_duration || ''}, ${otac.status || ''}\n`,
+        `${otac.name}, ${userCSVpart || ''}, ${redeemedStr}, ${otac.max_duration || ''}, ${otac.status || ''}\n`,
       );
     });
     const filename = currentScheduledEvent.event_name + '_OTACs.csv';