How do I get last modified date of an folder from FTP server in C#

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C#

Below is the code I am using

FtpWebRequest request = (FtpWebRequest)WebRequest.Create(Ftp_FilePath_dt);
request.Method = WebRequestMethods.Ftp.GetDateTimestamp;
FtpWebResponse response = (FtpWebResponse)request.GetResponse();

I want last modified date of the folder.

my FTP is like Ftp://111.00.00.000
Ftp_FilePath_dt = ftp://111.000.00.000/ABC/IB/TW/

In FtpWebresponse I am getting error

the requested uri is invalid for this ftp command

Immediate help is Appreciated!!

Thanks

What I have tried:

FtpWebRequest request = (FtpWebRequest)WebRequest.Create(Ftp_FilePath_dt);
request.Method = WebRequestMethods.Ftp.GetDateTimestamp;
FtpWebResponse response = (FtpWebResponse)request.GetResponse();