diff --git a/resources/js/composables/usePostCompliance.ts b/resources/js/composables/usePostCompliance.ts
index 9b563dee..5bfd6f57 100644
--- a/resources/js/composables/usePostCompliance.ts
+++ b/resources/js/composables/usePostCompliance.ts
@@ -1,5 +1,5 @@
-import { computed, type ComputedRef, type Ref } from 'vue';
 import { trans } from 'laravel-vue-i18n';
+import { computed, type ComputedRef, type Ref } from 'vue';
 
 import { getMediaItemIssue, type MediaItem } from '@/composables/useMedia';
 import { getMediaRulesForContentType } from '@/composables/useMediaRules';
diff --git a/resources/js/date.ts b/resources/js/date.ts
index c087a29f..913d4974 100644
--- a/resources/js/date.ts
+++ b/resources/js/date.ts
@@ -176,6 +176,18 @@ export default {
         return dayjs.utc(date).tz(getUserTimezone()).format('YYYY-MM-DDTHH:mm:00');
     },
 
+    /**
+     * Inverso de `formatUtcForDateTimeLocalInput`: recebe uma string vinda de um
+     * input `datetime-local` (no timezone do usuário) e devolve uma ISO 8601 em
+     * UTC pronta para enviar à API. Retorna `null` quando não houver data.
+     * @param date - String do input (YYYY-MM-DDTHH:mm[:ss]) ou nulo
+     * @returns ISO 8601 em UTC (ex.: 2026-05-19T19:40:00Z) ou null
+     */
+    formatLocalDateTimeForApi(date: string | null | undefined): string | null {
+        if (!date) return null;
+        return dayjs.tz(date, getUserTimezone()).utc().format();
+    },
+
     /**
      * Formata minutos para formato legível
      * @param minutes - Número de minutos
diff --git a/resources/js/pages/posts/Edit.vue b/resources/js/pages/posts/Edit.vue
index d8662d08..3230741b 100644
--- a/resources/js/pages/posts/Edit.vue
+++ b/resources/js/pages/posts/Edit.vue
@@ -236,9 +236,7 @@ const getSubmitData = () => {
         content: content.value,
         media: media.value,
         platforms,
-        scheduled_at: scheduledDateTime.value
-            ? dayjs(scheduledDateTime.value).utc().format()
-            : null,
+        scheduled_at: date.formatLocalDateTimeForApi(scheduledDateTime.value),
         label_ids: selectedLabelIds.value,
     };
 };