function getLastLogonTS{
    param($username)
    $DCs = Get-ADDomainController -Filter *| Select hostname
    foreach($d in $DCs) {
        $lasttime = $(Get-ADUser -Properties lastlogontimestamp $username -Server $d.hostname).lastlogontimestamp
        if($lasttime -gt $lastLogonTimestamp){
            $lastLogonTimestamp = $lasttime
        }
    }
        return [datetime]::fromFileTime($lastLogonTimestamp)
}