I FTP download the same set of file names multiple times in a day,
and I was using a date/time folder name to store them. This was becoming unmanageable.
I have developed a new solution, which I am presenting it here, more as a demonstration of technique,
than as an actual solution that you might employ.

I decided to store all the files in one folder, using a FileName_YYYYMMDD_HHMMSShs.Extension format.
This preserves the original file name and extension, guarantees uniqueness,
and documents when the files were received. To accomplish the task, Using techniques from:

tip 0494 » How to parse a batch parameter?
tip 1986 » How can I get an accurate time in a batch job?
tip 3243 » Windows 2000 FOR command enhancements.

I added the following to the end of the download batch:

<font size="1">FOR /F "usebackq tokens=*" %%n IN (`dir /b /a-d`) DO @FOR /F "usebackq tokens=2,3,4 delims=/ " %%d IN (`date /t`) DO @FOR /F "usebackq tokens=5-8 delims=:. " %%t IN (`echo.^|time`) DO @copy "%1\%%n" "<Destination Folder>\%%~nn_%%f%%d%%e_%%t%%u%%v%%w%%~xn"</font>

Analysing the command string

The first FOR command parses the <b>dir %1 /b /a-d</b>, capturing the file name(s) in the %%n parameter.
Embedded spaces are allowed because of the * token.

The second FOR parses the <b>Date /t</b> command. In my configuration, <b>date /t</b> returns day mm/dd/yyyy.
The "tokens=2,3,4 delims=/ " returns mm, dd, and yyyy as %%d, %%e, and %%f, respectively.

If you type <b>echo.|time</b> at a command prompt, it returns:
The current time is: HH:MM:SS.hs
Enter the new time:

The fourth FOR use "tokens=5-8 delims=:. " to parse HH, MM, SS, and hs as %%t, %%u, %%v, and %%w.
Using the COPY command, it composes the source file path as "\%%n" in the current folder.
The destination file  is composed using <Destination Folder>\, the file name component of %%n (%%~n),
 _, yyyymmdd (%%f%%d%%e), _, HHMMSShs (%%t%%u%%v%%w), and the original file extension (%%~xn).
I have created CopyNames.bat, for possible inclusion in other processes. The syntax for using CopyNames.bat is:

CopyNames <From Folder Path> <To Folder Path>

CopyNames.bat contains:

@echo off
if \{%1\}<h1><a name="_goto_syntax_if_2_">\{\} goto syntax
if \{%2\}</a></h1>\{\} goto syntax
if NOT exist %1/*.* goto syntax
if NOT exist %2 goto syntax
<font size="1">FOR /F "usebackq tokens=*" %%n IN (`dir %1 /b /a-d`) DO @FOR /F "usebackq tokens=2,3,4 delims=/ " %%d IN (`date /t`) DO @FOR /F "usebackq tokens=5-8 delims=:. " %%t IN (`echo.^|time`) DO @copy "%1\%%n" "%2\%%~nn_%%f%%d%%e_%%t%%u%%v%%w%%~xn"</font>
goto end
@echo ****************************
@echo CopyNames \{From Folder Path\} \{To Folder Path\}
@echo ****************************

<b>NOTE:</b>If the source folder contained a file named Products.MDB,
     the destination folder might contain Products_20010205_12511475.MDB.