diff --git a/src/ORM/client/client.service.ts b/src/ORM/client/client.service.ts
index 799be9f..6933507 100644
--- a/src/ORM/client/client.service.ts
+++ b/src/ORM/client/client.service.ts
@@ -48,7 +48,7 @@ export class ClientService {
         }
 
         const values = Object.entries(this.heartbeatBulkUpdate).map(([key, value]) => {
-            return  `('${value.id}', ${value.hashRate}, '${value.updatedAt.toISOString().slice(0, -1)}')`
+            return  `('${value.id}', ${value.hashRate}, '${value.updatedAt.toUTCString()}')`
         }).join(',');
 
         const query = `
diff --git a/src/services/app.service.ts b/src/services/app.service.ts
index e41d5df..1c8fd8f 100644
--- a/src/services/app.service.ts
+++ b/src/services/app.service.ts
@@ -53,12 +53,12 @@ export class AppService implements OnModuleInit {
         setInterval(async () => {
             //console.log('Bulk update client stats');
             await this.clientStatisticsService.doBulkAsyncUpdate();
-        }, 1000 * 60 * 1);
+        }, 1000 * 30);
 
         setInterval(async () => {
             //console.log('Bulk update client stats');
             await this.clientService.doBulkHeartbeatUpdate();
-        }, 1000 * 60 * 1);
+        }, 1000 * 30);
 
 
     }