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powershell delete files older than 15 days

Get-ChildItem "C:	emp" -Recurse -File | Where CreationTime -lt  (Get-Date).AddDays(-15)  | Remove-Item -Force

powershell how to delete files or folders last updated older than x days

Get-ChildItem -Path "C:Temp	emp" -Directory -recurse| where {$_.LastWriteTime -le $(get-date).Adddays(-10)} | Remove-Item -recurse -force
Get-ChildItem -Path "C:Temp	emp" -File -recurse| where {$_.LastWriteTime -le $(get-date).Adddays(-10)} | Remove-Item -recurse -force