Minor DateTime changes

src/Discord.Net/API/Presence.cs

@@ -14,7 +14,7 @@ namespace Discord.API
 		public class Data
 		{
 			[JsonProperty("idle_since")]
-			public ulong? IdleSince;
+			public long? IdleSince;
 			[JsonProperty("game_id")]
 			public int? GameId;
 		}

src/Discord.Net/API/Voice.cs

@@ -92,7 +92,7 @@ namespace Discord.API
 			public SocketInfo SocketData = new SocketInfo();
 		}
 	}
-	internal sealed class VoiceKeepAliveCommand : WebSocketMessage<ulong>
+	internal sealed class VoiceKeepAliveCommand : WebSocketMessage<long>
 	{
 		public VoiceKeepAliveCommand() : base(3, EpochTime.GetMilliseconds()) { }
 	}

src/Discord.Net/API/WebSockets.cs

@@ -41,7 +41,7 @@ namespace Discord.API
 	}
 
 	//Commands
-	internal sealed class KeepAliveCommand : WebSocketMessage<ulong>
+	internal sealed class KeepAliveCommand : WebSocketMessage<long>
 	{
 		public KeepAliveCommand() : base(1, EpochTime.GetMilliseconds()) { }
 	}

src/Discord.Net/DiscordClient.Users.cs

@@ -297,7 +297,7 @@ namespace Discord
 		}
 		private Task SendStatus()
 		{
-			_dataSocket.SendStatus(_status == UserStatus.Idle ? EpochTime.GetMilliseconds() - (10 * 60 * 1000) : (ulong?)null, _gameId);
+			_dataSocket.SendStatus(_status == UserStatus.Idle ? EpochTime.GetMilliseconds() - (10 * 60 * 1000) : (long?)null, _gameId);
 			return TaskHelper.CompletedTask;
 		}
 	}

src/Discord.Net/Helpers/EpochTime.cs

@@ -4,7 +4,8 @@ namespace Discord
 {
     internal class EpochTime
 	{
-		private static readonly DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
-		public static ulong GetMilliseconds() => (ulong)(DateTime.UtcNow - epoch).TotalMilliseconds;
+		private const long epoch = 621355968000000000L; //1/1/1970 in Ticks
+
+		public static long GetMilliseconds() => (DateTime.UtcNow.Ticks - epoch) / TimeSpan.TicksPerMillisecond;
 	}
 }

src/Discord.Net/Net/WebSockets/DataWebSocket.cs

@@ -120,7 +120,7 @@ namespace Discord.Net.WebSockets
 			return new KeepAliveCommand();
 		}
 
-		public void SendStatus(ulong? idleSince, int? gameId)
+		public void SendStatus(long? idleSince, int? gameId)
 		{
 			var updateStatus = new UpdateStatusCommand();
 			updateStatus.Payload.IdleSince = idleSince;

src/Discord.Net/Net/WebSockets/VoiceWebSocket.cs

@@ -36,14 +36,14 @@ namespace Discord.Net.WebSockets
 		private ushort _sequence;
 		private long? _serverId, _channelId, _userId;
 		private string _sessionId, _token, _encryptionMode;
-		private ulong _ping;
+		private int _ping;
 		
 		private Thread _sendThread, _receiveThread;
 
 		public long? CurrentServerId => _serverId;
 		public long? CurrentChannelId => _channelId;
 		public VoiceBuffer OutputBuffer => _sendBuffer;
-		public int Ping => (int)_ping;
+		public int Ping => _ping;
 
 		public VoiceWebSocket(DiscordWSClient client)
 			: base(client)
@@ -471,9 +471,9 @@ namespace Discord.Net.WebSockets
 					break;
 				case 3: //PONG
 					{
-						ulong time = EpochTime.GetMilliseconds();
-						var payload = (ulong)(long)msg.Payload;
-						_ping = payload - time;
+						long time = EpochTime.GetMilliseconds();
+						var payload = (long)msg.Payload;
+						_ping = (int)(payload - time);
 						//TODO: Use this to estimate latency
 					}
 					break;