delete if 30days old by folder name - date

Question

I am trying to delete all folders that are passed 30 days old but I need to base it off of the folder name instead of the creation date. Files get generated and put into a folder with the month on it and inside of it the Month date and year. The Month format is like this MM yyyy and month date like MMddyyyy. I had a script working in powershell v2 that worked well but stopped working in powershell V3.
This was my V2 script
function Delete-Folder-30days
$today = get-date -displayhint date
$30days = (get-date).AddDays(-30)
$folders = (gci "\\$args\Apps\AndrewTest" | where-object {$_.PSIsContainer -eq $True})
foreach ($f in $folders) {
$folderdate = get-date -mont $f.Name.substring(0,2) -day $f.Name.substring(2,2) -year $f.Name.substring(4,2)
if ($folderdate)
{
Remove-Item "\\$args\Apps\AndrewTest\$f" -recurse
}
}
}
Delete-Folder-30days $Server
What could i be doing wrong here?
Thanks,
Andrew

Answer 1

Try using the [DateTime]::ParseExact() method, it's much simpler for your purposes:
function Delete-Folder-30days{
gci "\\$args\Apps\AndrewTest" -Directory | ?{[datetime]::ParseExact($_.Name,"MMddyyyy",$null) -lt (get-date).AddDays(-30)} | Remove-Item -Recurse
}
Delete-Folder-30days $Server
Edit: Sorry! Had the String and Format switched (should be like ("04122014","MMddyyyy",$null)) but I had the first two arguments reversed.
Edit2: You want it to include .zip files as well? There's a couple of things. If you want to include all files then it is really simple. Just remove the -Directory from the GCI command and it will look at all files and folders in the target directory. If you ONLY want folders and .ZIP files then it gets a little more complicated. Basically we will still remove the -Directory switch, but we'll have to add some filtering into the Where clause as such:
?{($_.PSIsContainer -and [datetime]::ParseExact($_.Name,"MMddyyyy",$null) -lt (get-date).AddDays(-30)) -or ($_.Extension -ieq ".zip" -and [datetime]::ParseExact($_.BaseName,"MMddyyyy",$null) -lt (get-date).AddDays(-30))}
So now instead of just checking the specially formatted date, you are asking Is this a folder, or does it have the .zip file extension? If at least one of those two is true, does it match the specially formatted date?