diff --git a/src/repositories/event-repository.ts b/src/repositories/event-repository.ts
index c1f4b16..e9d1651 100644
--- a/src/repositories/event-repository.ts
+++ b/src/repositories/event-repository.ts
@@ -245,7 +245,7 @@ export class EventRepository implements IEventRepository {
           event_signature: pipe(always(''), toBuffer),
           event_delegator: always(null),
           event_deduplication: pipe(always([pubkey, 5]), toJSON),
-          deleted_at: always(date),
+          deleted_at: always(date.toISOString()),
         })
       )
     )
diff --git a/test/unit/repositories/event-repository.spec.ts b/test/unit/repositories/event-repository.spec.ts
index 6ea975c..dace5c1 100644
--- a/test/unit/repositories/event-repository.spec.ts
+++ b/test/unit/repositories/event-repository.spec.ts
@@ -451,7 +451,7 @@ describe('EventRepository', () => {
     it('insert stubs by pubkey & event ids', () => {
       const query = repository.insertStubs('001122', ['aabbcc', 'ddeeff']).toString()
 
-      expect(query).to.equal('insert into "events" ("deleted_at", "event_content", "event_created_at", "event_deduplication", "event_delegator", "event_id", "event_kind", "event_pubkey", "event_signature", "event_tags") values (\'1970-01-20 03:57:15.425\', \'\', 1673835, \'["001122",5]\', NULL, X\'aabbcc\', 5, X\'001122\', X\'\', \'[]\'), (\'1970-01-20 03:57:15.425\', \'\', 1673835, \'["001122",5]\', NULL, X\'ddeeff\', 5, X\'001122\', X\'\', \'[]\') on conflict do nothing')
+      expect(query).to.equal('insert into "events" ("deleted_at", "event_content", "event_created_at", "event_deduplication", "event_delegator", "event_id", "event_kind", "event_pubkey", "event_signature", "event_tags") values (\'1970-01-20T08:57:15.425Z\', \'\', 1673835, \'["001122",5]\', NULL, X\'aabbcc\', 5, X\'001122\', X\'\', \'[]\'), (\'1970-01-20T08:57:15.425Z\', \'\', 1673835, \'["001122",5]\', NULL, X\'ddeeff\', 5, X\'001122\', X\'\', \'[]\') on conflict do nothing')
     })
   })