diff --git a/src/request-management/request-management.service.ts b/src/request-management/request-management.service.ts
index 3b3df8b..7100100 100644
--- a/src/request-management/request-management.service.ts
+++ b/src/request-management/request-management.service.ts
@@ -870,15 +870,24 @@ export class RequestManagementService {
     }
 
     // ---- External inquiry 2: personal identity check (insurer/driver nationalCode + birthDate) ----
+    // The form sends the birthday as a Jalali date in any of these shapes:
+    //   - number   13770624      (packed YYYYMMDD)
+    //   - string   "1377-06-24"  /  "1377/06/24"  /  "13770624"
+    // We forward it as-is; sandHubService.getPersonalInquiry() handles the
+    // Jalali → Gregorian conversion required by the external API.
     const personalNationalCode =
       body.nationalCodeOfInsurer || body.nationalCodeOfDriver;
-    const birthDateRaw =
-      body.insurerBirthday ?? body.driverBirthday ?? null;
-    const birthDateDigits = String(birthDateRaw ?? "")
-      .replace(/\D/g, "")
-      .trim();
-    const personalBirthDate = Number(birthDateDigits);
-    if (!personalNationalCode || !Number.isFinite(personalBirthDate) || personalBirthDate <= 0) {
+    const personalBirthDate: number | string | null =
+      (body.insurerBirthday ?? body.driverBirthday ?? null) as
+        | number
+        | string
+        | null;
+    if (
+      !personalNationalCode ||
+      personalBirthDate === null ||
+      personalBirthDate === undefined ||
+      String(personalBirthDate).trim() === ""
+    ) {
       throw new BadRequestException(
         "Valid nationalCode and birthDate are required for personal inquiry.",
       );