diff --git a/src/controllers/SalaryPeriodController.ts b/src/controllers/SalaryPeriodController.ts
index c749880..fc3e991 100644
--- a/src/controllers/SalaryPeriodController.ts
+++ b/src/controllers/SalaryPeriodController.ts
@@ -748,7 +748,7 @@ export class SalaryPeriodController extends Controller {
     if (chk_period) {
       throw new HttpError(
         HttpStatusCode.NOT_FOUND,
-        "ประเภทผังปี " + salaryPeriod.effectiveDate.getFullYear() + " ซ้ำ",
+        "ประเภทผังปี " + Extension.ToThaiYear(salaryPeriod.year) + " ซ้ำ",
       );
     }
 
@@ -796,7 +796,7 @@ export class SalaryPeriodController extends Controller {
     if (chk_period) {
       throw new HttpError(
         HttpStatusCode.NOT_FOUND,
-        "ประเภทผังปี " + (requestBody.effectiveDate.getFullYear() + 543) + " ซ้ำ",
+        "ประเภทผังปี " + Extension.ToThaiYear(requestBody.year) + " ซ้ำ",
       );
     }