fix birthday nullable

Src/Dlhis.Basic/Organization/Response/GainfoCurrentResponse.cs

@@ -45,8 +45,13 @@ public class GainfoCurrentResponse
     /// <summary>
     /// 出生日期/生日
     /// </summary>
-    [JsonConverter(typeof(ToDateJsonConverter))]
-    public DateTime Birthday { get; set; }
+    public string Birthday
+    {
+        get { return OriginalBirthday.HasValue ? OriginalBirthday.Value.ToString("yyyy-MM-dd") : "0000-00-00"; }
+    }
+
+
+    public DateTime? OriginalBirthday { get; set; }
 
     /// <summary>
     /// 厂区编码

Src/Dlhis.Basic/Organization/Response/GainfoDetailResponse.cs

@@ -67,15 +67,21 @@ public class GainfoDetailResponse
     /// 身份证地址
     /// </summary>
     public string Address { get; set; }
-    
+
     [JsonIgnore]
-    public DateTime OriginalBirthday { get; set; }
+    public DateTime? OriginalBirthday { get; set; }
 
     /// <summary>
     /// 出生日期
     /// </summary>
     [JsonConverter(typeof(ObfuscateProviderJsonConverter), 0)]
-    public string Birthday => OriginalBirthday.ToString("yyyy-MM-dd");
+    public string Birthday
+    {
+        get
+        {
+            return OriginalBirthday.HasValue ? OriginalBirthday.Value.ToString("yyyy-MM-dd") : "0000-00-00";
+        }
+    }
 
     /// <summary>
     /// 手机号码