diff --git a/src/Pipedrive.net/Models/Response/Activity.cs b/src/Pipedrive.net/Models/Response/Activity.cs
index 5094f979..49213815 100644
--- a/src/Pipedrive.net/Models/Response/Activity.cs
+++ b/src/Pipedrive.net/Models/Response/Activity.cs
@@ -35,8 +35,8 @@ public class Activity : IDealUpdateEntity
         [JsonProperty("duration")]
         public string Duration { get; set; }
 
-        [JsonProperty("add_date")]
-        public DateTime AddDate { get; set; }
+        [JsonProperty("add_time")]
+        public DateTime AddTime { get; set; }
 
         [JsonProperty("marked_as_done_time")]
         public DateTime? MarkedAsDoneTime { get; set; }
diff --git a/src/Pipedrive.net/Models/Response/DealActivity.cs b/src/Pipedrive.net/Models/Response/DealActivity.cs
index e2c8b783..539b7865 100644
--- a/src/Pipedrive.net/Models/Response/DealActivity.cs
+++ b/src/Pipedrive.net/Models/Response/DealActivity.cs
@@ -109,5 +109,24 @@ public class DealActivity
 
         [JsonProperty("assigned_to_user_id")]
         public long? AssignedToUserId { get; set; }
+
+        public Activity ToActivity()
+        {
+            return new Activity
+            {
+                Subject = Subject,
+                Done = Done,
+                Type = Type,
+                DueDate = DueDate,
+                DueTime = DueTime,
+                Duration = Duration,
+                UserId = UserId.Id,
+                DealId = DealId.Id,
+                PersonId = PersonId.Value,
+                Participants = Participants,
+                OrgId = OrgId.Value,
+                Note = Note
+            };
+        }
     }
 }