The project is an MVC website coded and built using VS2017 and (on premises) TFS2017. The Build Definition is currently working and publishing to the staging location upon check-in.

The PowerShell script below, derived from David Kittle's website, is being used but it uploads all files every time. I abbreviated the listing using comments to focus on the part of the script for which I'd like to ask for help/guidance.

# Setup the FTP connection, destination URL and local source directory
# Put the folders and files to upload into $Srcfolders and $SrcFiles
# Create destination folders as required

# start file uploads
foreach($entry in $SrcFiles)
{
    #Create full destination filename from $entry and put it into $DesFile
    $uri = New-Object System.Uri($DesFile) 

    #NEED TO GET THE REMOTE FILE DATA HERE TO TEST AGAINST THE LOCAL FILE
    If (#perform a test to see if the file needs to be uploaded)
        { $webclient.UploadFile($uri, $SrcFullname) }
}

In the last few lines of the script above I need to determine if a source file requires upload. I am assuming I can check the time stamp to determine this. So;

If my assumption is wrong, please advise the best way to check for a required upload.

If my assumption is correct, how do I (1) retrieve the time stamp from the remote server and then (2) make the check against the local file?