Get-ChildItem
Using this you can get the file list from a directory. Gets the items and child items in one or more specified locations.
Get-ChildItem “<path>” -Recurse -Filter <*.*> | where {$_.LastWriteTime -le(Get-Date).AddDays(-<amount of days>) }
that command can delete older files from a directory. can be useful when making backups
Or get a list of files that were created today.
Get-ChildItem $source | where-object {$_.LastWriteTime -eq (Get-Date)}