diff --git a/src/modules/contents/pages/components/SinglePageSettingModal.vue b/src/modules/contents/pages/components/SinglePageSettingModal.vue
index 49916a85e..f438b7af6 100644
--- a/src/modules/contents/pages/components/SinglePageSettingModal.vue
+++ b/src/modules/contents/pages/components/SinglePageSettingModal.vue
@@ -177,7 +177,7 @@ const publishTime = computed(() => {
 });
 
 const onPublishTimeChange = (value: string) => {
-  formState.value.spec.publishTime = toISOString(value);
+  formState.value.spec.publishTime = value ? toISOString(value) : undefined;
 };
 </script>
 
diff --git a/src/modules/contents/posts/components/PostSettingModal.vue b/src/modules/contents/posts/components/PostSettingModal.vue
index 3c1418490..93473d751 100644
--- a/src/modules/contents/posts/components/PostSettingModal.vue
+++ b/src/modules/contents/posts/components/PostSettingModal.vue
@@ -169,7 +169,7 @@ const publishTime = computed(() => {
 });
 
 const onPublishTimeChange = (value: string) => {
-  formState.value.spec.publishTime = toISOString(value);
+  formState.value.spec.publishTime = value ? toISOString(value) : undefined;
 };
 </script>
 <template>