Fix #239

src/Discord.Net.Core/Entities/Interactions/IDiscordInteraction.cs

@@ -37,6 +37,11 @@ namespace Discord
         /// </summary>
         int Version { get; }
 
+        /// <summary>
+        ///     Gets the time that the interaction was received.
+        /// </summary>
+        DateTimeOffset ReceivedAt { get; }
+
         /// <summary>
         ///     Responds to an Interaction with type <see cref="InteractionResponseType.ChannelMessageWithSource"/>.
         /// </summary>

src/Discord.Net.Rest/Entities/Interactions/InteractionHelper.cs

@@ -17,7 +17,7 @@ namespace Discord.Rest
         #region InteractionHelper
         public static bool CanSendResponse(IDiscordInteraction interaction)
         {
-            return (DateTime.UtcNow - interaction.CreatedAt).TotalSeconds < ResponseTimeLimit;
+            return (DateTime.UtcNow - interaction.ReceivedAt).TotalSeconds < ResponseTimeLimit;
         }
         public static bool CanRespondOrFollowup(IDiscordInteraction interaction)
         {

src/Discord.Net.WebSocket/Entities/Interaction/SocketInteraction.cs

@@ -47,6 +47,10 @@ namespace Discord.WebSocket
         public DateTimeOffset CreatedAt
             => SnowflakeUtils.FromSnowflake(Id);
 
+        /// <inheritdoc/>
+        public DateTimeOffset ReceivedAt { get; private set; }
+            
+
         internal abstract bool _hasResponded { get; set; }
 
         /// <summary>
@@ -58,6 +62,7 @@ namespace Discord.WebSocket
         internal SocketInteraction(DiscordSocketClient client, ulong id, ISocketMessageChannel channel)
             : base(client, id)
         {
+            ReceivedAt = DateTime.UtcNow;
             Channel = channel;
         }