diff --git a/app/Request/InquiryRequest.php b/app/Request/InquiryRequest.php
index ae65fee..43dbe54 100644
--- a/app/Request/InquiryRequest.php
+++ b/app/Request/InquiryRequest.php
@@ -66,7 +66,7 @@ class InquiryRequest extends FormRequest
             'patient_id' => 'required',
             'family_id' => 'required',
             'disease_class_id' => 'required',
-            'diagnosis_date' => 'date',
+            'diagnosis_date' => ['sometimes','date'],
             'disease_desc' => 'required',
             'is_allergy_history' => ['sometimes','numeric','min:0','max:1'],
             'is_family_history' => ['sometimes','numeric','min:0','max:1'],