Touch / Sync file and/or folder (directory) date and time timestamp between two file paths without copying files or folders.

touchsync.ps1

# Filename: touchsync.ps1
# Purpose: To touch / Sync file and/or folder date and time timestamp between two file paths without copying.
#          files or folders. The default is to just touch folders. See comment in code to change this.
# Language: PowerShell for Windows.
# Version: 0.1
# Author: Michael Milette
# Copyright 2018 TNG Consulting Inc.
# License: GNU GPL 3.

# Configuration section. Note: Trailing slash must be included in the following paths. Example: "C:\DEV\":
$origpath="G:\";
$newpath="D:\";

# Search the directory tree.
# get-childitem -Path $newpath -recurse | ForEach-Object {
# Searches just folders in the target directory structure tree. To search for files and folders (directories),
# comment line below and uncomment the "get-childitem..." line above.
get-childitem -Directory -Path $newpath -recurse | ForEach-Object {
    $newfile = $_.FullName;
    $fname = $newfile -replace [regex]::Escape($newpath);
    $origfile = "$origpath$fname";

    If (Test-Path "$origfile") {
        If ( (Get-Item "$newfile") -Is [System.IO.DirectoryInfo]) {
            "Dir: Setting ""$newfile"" Last Modified Time to the Last Modified Time of ""$origfile""";
            (Get-Item "$newfile").LastWriteTime = (Get-Item "$origfile").LastWriteTime;
        } Else {
            "File: Setting ""$newfile"" Last Modified Time to the Last Modified Time of ""$origfile""";
            (Get-ChildItem "$newfile" ).LastWriteTime = ( Get-ChildItem "$origfile" ).LastWriteTime;
        }
    }
}