diff --git a/apps/cs/src/entities/posting/model/posting-interface.ts b/apps/cs/src/entities/posting/model/posting-interface.ts
index 0c9d65a51..c314d2f30 100644
--- a/apps/cs/src/entities/posting/model/posting-interface.ts
+++ b/apps/cs/src/entities/posting/model/posting-interface.ts
@@ -19,8 +19,8 @@ export const postSchema = z.object({
   pstgTypeCd: z.string(),
   pstgTypeNm: z.string(),
   pstgTrgtNo: z.number(),
-  pstgBgngDt: z.string(),
-  pstgEndDt: z.string(),
+  pstgBgngDt: z.string().optional(),
+  pstgEndDt: z.string().optional(),
   pstgPrdSeCd: z.string(),
   pstgPrdSeNm: z.string(),
   delYn: z.string(),
diff --git a/apps/cs/src/entities/posting/ui/posting-dialog.tsx b/apps/cs/src/entities/posting/ui/posting-dialog.tsx
index df07e2182..d7c0b60ca 100644
--- a/apps/cs/src/entities/posting/ui/posting-dialog.tsx
+++ b/apps/cs/src/entities/posting/ui/posting-dialog.tsx
@@ -90,6 +90,9 @@ function PostingDialog({ postingType, postingTargets }: PostingDialogProps) {
     name: "pstg",
   });
 
+  const isFormValid =
+    fields.length && fields.every((field) => field.pstgPrdSeCd !== "");
+
   const isAllSelected =
     siteList && selectedRows.length === siteList.content.length;
 
@@ -164,19 +167,28 @@ function PostingDialog({ postingType, postingTargets }: PostingDialogProps) {
       replace([]);
       setSelectedRows([]);
     } else {
-      setSelectedRows(siteList?.content.map((_, i) => i) ?? []);
       replace([]);
+      setSelectedRows(siteList?.content.map((_, i) => i) ?? []);
       siteList?.content.forEach((_, i) => handleAppendFields(i));
     }
   };
 
   const handlePeriodCodeChange = (siteId: string) => (value: string) => {
+    const from = dayjs().format("YYYY-MM-DD 00:00:00");
+    const to = dayjs().add(Number(value), "day").format("YYYY-MM-DD 23:59:59");
+
     setRememberPeriodCode((prev) => ({
       ...prev,
       [siteId]: value,
     }));
+    setRememberPeriodDate((prev) => ({
+      ...prev,
+      [siteId]: { from, to },
+    }));
     handleUpdateFields(siteId)({
       pstgPrdSeCd: value,
+      pstgBgngDt: from,
+      pstgEndDt: to,
     });
   };
 
@@ -288,7 +300,7 @@ function PostingDialog({ postingType, postingTargets }: PostingDialogProps) {
           </Table>
         </div>
         <DialogFooter className="!justify-center">
-          <Button size="lg" onClick={handleSave}>
+          <Button size="lg" onClick={handleSave} disabled={!isFormValid}>
             저장
           </Button>
           <DialogClose asChild>