implement GuildMember PremiumSince

src/Discord.Net.Core/Entities/Users/IGuildUser.cs

@@ -48,6 +48,13 @@ namespace Discord
         /// </returns>
         ulong GuildId { get; }
         /// <summary>
+        ///     Gets the date and time for when this user's guild boost began.
+        /// </summary>
+        /// <returns>
+        ///     A <see cref="DateTime"/> for when the user began boosting this guild; <c>null</c> if they are not boosting the guild.
+        /// </returns>
+        DateTime? PremiumSince { get; }
+        /// <summary>
         ///     Gets a collection of IDs for the roles that this user currently possesses in the guild.
         /// </summary>
         /// <remarks>

src/Discord.Net.Rest/Entities/Users/RestGuildUser.cs

@@ -24,7 +24,8 @@ namespace Discord.Rest
         public bool IsDeafened { get; private set; }
         /// <inheritdoc />
         public bool IsMuted { get; private set; }
-
+        /// <inheritdoc />
+        public DateTime? PremiumSince { get; private set; }
         /// <inheritdoc />
         public ulong GuildId => Guild.Id;
 
@@ -69,6 +70,8 @@ namespace Discord.Rest
                 IsMuted = model.Mute.Value;
             if (model.Roles.IsSpecified)
                 UpdateRoles(model.Roles.Value);
+            if (model.PremiumSince.IsSpecified)
+                PremiumSince = model.PremiumSince.Value;
         }
         private void UpdateRoles(ulong[] roleIds)
         {

src/Discord.Net.Rest/Entities/Users/RestWebhookUser.cs

@@ -13,6 +13,8 @@ namespace Discord.Rest
         /// <inheritdoc />
         public ulong WebhookId { get; }
         internal IGuild Guild { get; }
+        /// <inheritdoc />
+        public DateTime? PremiumSince { get; private set; }
 
         /// <inheritdoc />
         public override bool IsWebhook => true;

src/Discord.Net.WebSocket/Entities/Users/SocketGuildUser.cs

@@ -76,6 +76,9 @@ namespace Discord.WebSocket
         public SocketVoiceState? VoiceState => Guild.GetVoiceState(Id);
         public AudioInStream AudioStream => Guild.GetAudioStream(Id);
 
+        /// <inheritdoc />
+        public DateTime? PremiumSince { get; private set; }
+
         /// <summary>
         ///     Returns the position of the user within the role hierarchy.
         /// </summary>

src/Discord.Net.WebSocket/Entities/Users/SocketWebhookUser.cs

@@ -63,6 +63,8 @@ namespace Discord.WebSocket
         /// <inheritdoc />
         string IGuildUser.Nickname => null;
         /// <inheritdoc />
+        DateTime? IGuildUser.PremiumSince => null;
+        /// <inheritdoc />
         GuildPermissions IGuildUser.GuildPermissions => GuildPermissions.Webhook;
 
         /// <inheritdoc />