Add SentTimestamp to SQSMetadata

.autover/changes/45a6ab22-5bb9-4b65-bfb1-94571b502622.json

@@ -0,0 +1,11 @@
+{
+  "Projects": [
+    {
+      "Name": "AWS.Messaging",
+      "Type": "Patch",
+      "ChangelogMessages": [
+        "Add SentTimestamp to SQSMetadata"
+      ]
+    }
+  ]
+}

src/AWS.Messaging/SQSMetadata.cs

@@ -30,6 +30,11 @@ public class SQSMetadata
         /// </summary>
         public string? MessageGroupId { get; set; }
 
+        /// <summary>
+        /// The time at which the message was sent to the queue.
+        /// </summary>
+        public DateTimeOffset? SentTimestamp { get; set; }
+
         /// <summary>
         /// Each message attribute consists of a Name, Type, and Value.For more information, see Amazon SQS message attributes (https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-message-metadata.html#sqs-message-attributes)
         /// </summary>

src/AWS.Messaging/Serialization/Handlers/MessageMetadataHandler.cs

@@ -31,6 +31,12 @@ public static SQSMetadata CreateSQSMetadata(Message message)
         {
             metadata.MessageGroupId = JsonPropertyHelper.GetAttributeValue(message.Attributes, "MessageGroupId");
             metadata.MessageDeduplicationId = JsonPropertyHelper.GetAttributeValue(message.Attributes, "MessageDeduplicationId");
+
+            var sentTimestamp = JsonPropertyHelper.GetAttributeValue(message.Attributes, "SentTimestamp");
+            if (!string.IsNullOrEmpty(sentTimestamp) && long.TryParse(sentTimestamp, out var epochMilliseconds))
+            {
+                metadata.SentTimestamp = DateTimeOffset.FromUnixTimeMilliseconds(epochMilliseconds);
+            }
         }
 
         return metadata;