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$threshold = $args[0]
#Set deadline date
$deadline = (Get-Date).AddDays($threshold)
$Certs = Get-ChildItem Cert:\LocalMachine\My | where {$_.notafter -lt $deadline} |
select issuer, subject,notafter, @{Label="Expires In (Days)";Expression={($_.NotAfter - (Get-Date)).Days}}
If ($Certs) {$Certs} Else { Write-Host "There are no certificates expiring in $Threshold days." }