How force timestamp of folders recursevely with Powershell?

With PowerShell i use this script:

$item =  Get-ChildItem -force -recurse | Where-Object {! $_.PSIsContainer} 
foreach($object in $item)
{
     $object.CreationTime=("31 December 2019 23:59:59")
     $object.LastWriteTime=("31 December 2019 23:59:59")
     $object.LastAccessTime=("31 December 2019 23:59:59")
}

And it change timestamp for file only but not has effects on folders. How i can fix it, so which too timestamp of folders is update?
Thanks very much.

Because in your code you are filtering out directories with | Where-Object {! $_.PSIsContainer}, the function will not do anything on folders.

You can simplify the code using something like this:

$date = Get-Date -Year 2019 -Month 12 -Day 31 -Hour 23 -Minute 59 -Second 59

Get-ChildItem -Path 'D:\Test' -Force -Recurse | ForEach-Object {
     $_.CreationTime   = $date
     $_.LastWriteTime  = $date
     $_.LastAccessTime = $date
}

Mind you, the rootfolder (in this example D:\Test) itself wil not be affected, only all files and folders inside the rootfolder will get new timestamps.

<hr>

As for your question about LastAccessTime not being affected:

Windows will automatically update the LastAccessTime on directories when listed in Explorer. This is handles by a registry setting.
It is possible to turn off that feature by setting this registry entry to 1
(Default value is 0)

• 0 When listing directories, NTFS updates the last-access timestamp on each directory it detects, and it records each time change in the NTFS log.
• 1 When listing directories, NTFS does not update the last-access timestamp, and it does not record time stamp updates in the NTFS log.

To disable the automatic update of the LastAccessTime on directories:

Set-ItemProperty -Path 'HKLM:SYSTEM\CurrentControlSet\Control\FileSystem' -Name NtfsDisableLastAccessUpdate -Value 1 -Type DWord

To (re)enable the default behaviour:

Set-ItemProperty -Path 'HKLM:SYSTEM\CurrentControlSet\Control\FileSystem' -Name NtfsDisableLastAccessUpdate -Value 0 -Type DWord

Possible values for NtfsDisableLastAccessUpdate

0 - User Managed, Last Access Updates Enabled
1 - User Managed, Last Access Updates Disabled
2 - System Managed, Last Access Updates Enabled
3 - System Managed, Last Access Updates Disabled

Although in Windows 10 these values have changed to negative values (in hex):

0x80000000 - User Managed, Last Access Updates Enabled
0x80000001 - User Managed, Last Access Updates Disabled
0x80000002 - System Managed, Last Access Updates Enabled
0x80000003 - System Managed, Last Access Updates Disabled

LastAccessTime

Hope that explains somewhat