Unityで日付で保存しようとしたらエラー

こんにちは。現在UnityでWebカメラで撮影した画像を保存するアプリを作っています
そこで以下のようなコードを書きました

C#
1public void Save()
2	{
3		// 描画した画像を保存する
4		// 保存フォルダがなければ作っておく
5		if (!Directory.Exists("graphic"))
6		{
7			Directory.CreateDirectory("graphic");
8		}
9		// 保存する
10		var data = EditBaseImage.EncodeToJPG();
11		string current = Directory.GetCurrentDirectory() + "\graphic";
12		File.WriteAllBytes( @current + "\" + DateTime.Now.ToString("yyyy-MM-dd-HH:mm:ss") + ".jpg", data);
13	}

ここでEditBaaseImageが書き込むTexture2Dです
graphicフォルダを作り、その中に現在時刻をファイル名にして書き込みたいわけですが、これを実行すると以下のようなエラーが出ます。上記のファイルでDateTime.Now.ToString("yyyy-MM-dd-HH:mm:ss") + ".jpg"を"test.jpg"など時刻以外にすると保存できます
現在時刻で保存するにはどのようにすればよろしいでしょうか？

Void DrawSendCameraData(Byte[]): System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.IO.DirectoryNotFoundException: Could not find a part of the path "C:\RemortSupportTest1\RemortSupprotTest1-4\graphic\2019-07-10-11:37:03.jpg".
at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean anonymous, System.IO.FileOptions options) [0x00164] in <d7ac571ca2d04b2f981d0d886fa067cf>:0
at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize) [0x00000] in <d7ac571ca2d04b2f981d0d886fa067cf>:0
at (wrapper remoting-invoke-with-check) System.IO.FileStream..ctor(string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare,int)
at System.IO.File.Create (System.String path, System.Int32 bufferSize) [0x00000] in <d7ac571ca2d04b2f981d0d886fa067cf>:0
at System.IO.File.Create (System.String path) [0x00000] in <d7ac571ca2d04b2f981d0d886fa067cf>:0
at System.IO.File.WriteAllBytes (System.String path, System.Byte[] bytes) [0x00000] in <d7ac571ca2d04b2f981d0d886fa067cf>:0
at RoomScene.Save () [0x0003b] in C:\RemortSupportTest1\RemortSupprotTest1-4\Assets\Scripts\RoomScene.cs:625
at RoomScene.DrawSendCameraData (System.Byte[] texturedata) [0x00071] in C:\RemortSupportTest1\RemortSupprotTest1-4\Assets\Scripts\RoomScene.cs:609
at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke(System.Reflection.MonoMethod,object,object[],System.Exception&)
at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00032] in <d7ac571ca2d04b2f981d0d886fa067cf>:0
--- End of inner exception stack trace ---
at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00048] in <d7ac571ca2d04b2f981d0d886fa067cf>:0
at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in <d7ac571ca2d04b2f981d0d886fa067cf>:0
at Monobit.RPC+p.A (System.Object , System.Reflection.MethodInfo , System.Object[] args) [0x00036] in <a3956b2d59af4c40b6c93abce3abcd4f>:0
UnityEngine.Debug:LogError(Object)
Mrs:mrs_console_log(MrsLogLevel, String)
Mrs:mrs_output_log(MrsLogLevel, String)
Mrs:MRS_LOG_ERR(String, Object[])
mun.MunLogger:MRSEXT_LOG_ERR(String, Object[])
Monobit.p:A(Object, MethodInfo, Object[])
Monobit.p:A(String, Object[])
Monobit.RPC:Recv(String, Object[])
MonobitEngineBase.MonobitView:OnRPC(String, Object[])
MonobitEngineBase.MonobitView:OnRPC(String, MonobitTargets, Object[])
A.K:A(Byte, Object[])
A.J:A(RoomRPCResponse&)
mun.MunClientSessionToRoomServer:OnReadRecordCallback(IntPtr, IntPtr, UInt32, UInt16, UInt16, IntPtr, UInt32)
Mrs:mrs_update()
mun.MunClient:FixedUpdate()