Appending date/time to file AND updating last modified/save date - windows

Question

I am trying to automate some file renaming but also need the file to update it's "last modified" time as I have a field inserted within the Word document that dynamically updates the last time the file was edited.
copy C:\path\to\file\test\test.docx "C:\path\to\file\test2\test-%date:~-7,2%-%date:~-10,2%-%date:~-4,4% %time:~-11,2%%time:~-8,2%.docx"
I tried to integrate the following syntax:
copy /b filename.ext +,,
That I got from:
https://superuser.com/questions/10426/windows-equivalent-of-the-linux-command-touch/764716
However it did not output anything when I put the + after the source file.
copy /b "C:\path\to\file\test\test.docx" + "C:\path\to\file\test2\test-
%date:~-7,2%-%date:~-10,2%-%date:~-4,4% %time:~-11,2%%time:~-8,2%.docx"
I also tried invoking a PowerShell script within the batch file to update last modified date:
$file = Get-Item C:\Path\TO\test.docx
$file.LastWriteTime = (Get-Date)
copy C:\path\to\file\test\test.docx "C:\path\to\file\test2\test-
%date:~-7,2%-%date:~-10,2%-%date:~-4,4% %time:~-11,2%%time:~-8,2%.docx"
powershell -file C:\path\to\powershell.ps1
Can't get it to work either way, I'm new to this so probably missing something simple.

Answer 1

I was able to figure this one out. My batch file is now as follows:
powershell -command "(Get-Item "C:\path\to\file\test\test.docx").LastWriteTime = (Get-
Date)"
copy C:\path\to\file\test\test.docx "C:\path\to\file\test2\test-%date:~-7,2%-
%date:~-10,2%-%date:~-4,4%%time:~-11,2%%time:~-8,2%.docx"
Which first modifies the last edited date of the file, and then copies it over to test 2 folder with the time and date appended.

Answer 2

I'm a bit curious what you mean with:
I have a field inserted within the Word document that dynamically updates the last time the file was edited.
If you copy a file it's content is not altered and the LastWriteTime stays the same,
so why do you want to set LastWriteTime to current date&time?
As per your attempt with copy in cmd.exe you did omit the two commas, this should do:
copy /b "C:\path\to\file\test\test.docx" + , , "C:\path\to\file\test2\test-%date:~-7,2%-%date:~-10,2%-%date:~-4,4% %time:~-11,2%%time:~-8,2%.docx"
The PowerShell suggestion from my comment:
'C:\path\to\file\test\test.docx' |
Get-Item |
Copy-Item -Destination {'{0}\{1}-{2:MMddyyyy\ HHmm}{3}' -f `
$_.Directory, $_.Basename,
$_.LastWriteTime, $_.Extension} -WhatIf
Could be modified to rename all files with date time appendix to reflect the actual LastWriteTime.
Get-ChildItem -File -Filter *.docx |
Where BaseName -Match '-\d{8} \d{4}$' |
Rename-Item -NewName {'{0}-{1:MMddyyyy\ HHmm}{2}' -f `
$_.Basename.Replace($Matches[0],''),
$_.LastWriteTime, $_.Extension} -WhatIf
If the NewName is the same, Rename-Item ignores it.
In contrast to Copy-Item, Rename-Item doesn't allow a directory.