diff --git a/airflow-core/src/airflow/ui/src/components/DateTimeInput.tsx b/airflow-core/src/airflow/ui/src/components/DateTimeInput.tsx
index 3ee9dbf62c8bc..cd7bd6ca8c717 100644
--- a/airflow-core/src/airflow/ui/src/components/DateTimeInput.tsx
+++ b/airflow-core/src/airflow/ui/src/components/DateTimeInput.tsx
@@ -47,7 +47,7 @@ export const DateTimeInput = forwardRef<HTMLInputElement, Props>(({ onChange, va
           target: {
             ...event.target,
             value: dayjs(event.target.value).isValid()
-              ? dayjs(event.target.value).tz(selectedTimezone, true).toISOString()
+              ? dayjs.tz(event.target.value, selectedTimezone).toISOString() // UI Timezone -> Utc -> yyyy-mm-ddThh:mm
               : "",
           },
         })