Create single hostname certificate with PowerShell

#Script starts by clearing terminal screen
Clear-Host

#----Retrives date into string and modifies it to remove special characters

$dt = Get-Date

$dtShort = $dt.ToShortDateString()
$dtShort = $dtShort -replace '[/]',""

$tmShort = $dt.ToShortTimeString()
$tmShort = $tmShort -replace '[:]',"-"

#----Asks user to input a SAN/ hostname

$SAN1 = Read-Host "Please enter SAN 1"

#----Creates folder structure based on SAN/hostname

New-Item -Path ".\" -Name "$SAN1" -ItemType "directory"
New-Item -Path ".\$SAN1" -Name "$dtShort" -ItemType "directory"
New-Item -Path ".\$SAN1\$dtShort" -Name "$tmShort" -ItemType "directory"

#----Assigns file path and name to the certificate request file, and copies the request template to that location

$fileName = ".\$SAN1\$dtShort\$tmShort\00certDetails$SAN1.inf"
copy .\00certDetails.inf $filename

#----Creates additional SANs with FQDNs

$SAN1fqdn1 = $SAN1+".domain.local"
$SAN1fqdn2 = $SAN1+".otherdomain.local"

#----Modifies a SAN string to match the formatting required for certreq.exe

$fullSAN = '{text}dns='+$SAN1+'&dns='+$SAN1fqdn1+'&dns='+$SAN1fqdn2

#----Gets the contents of the request file and replaces placeholders with actual values for the initial hostname and additional SANs

(Get-Content -Path $filename) |
    ForEach-Object {$_ -Replace 'FQDN', $SAN1fqdn1} |
        Set-Content -Path $filename

(Get-Content -Path $filename) |
    ForEach-Object {$_ -Replace 'CUSTOMSANS', $fullSAN} |
        Set-Content -Path $filename

#----Start of certreq/certutil process: converts the modified .inf template file into a .req file

$host.ui.RawUI.ForegroundColor = "red"
Write-Host "Step 1"
$host.ui.RawUI.ForegroundColor = "white"
certreq -new $fileName ".\$SAN1\$dtShort\$tmShort\00certDetails$SAN1.req"

#----Checks the .req file with certutil

$host.ui.RawUI.ForegroundColor = "red"
Write-Host "Step 2"
$host.ui.RawUI.ForegroundColor = "white"
certutil ".\$SAN1\$dtShort\$tmShort\00certDetails$SAN1.req"

#----Submits the .req file to the CA and outputs to a .cer file

$host.ui.RawUI.ForegroundColor = "red"
Write-Host "Step 3"
$host.ui.RawUI.ForegroundColor = "white"
certreq -attrib "CertificateTemplate:TemplateWithoutSpaces" -submit ".\$SAN1\$dtShort\$tmShort\00certDetails$SAN1.req" ".\$SAN1\$dtShort\$tmShort\00certDetails$SAN1.cer"

#----Installs the certificate

$host.ui.RawUI.ForegroundColor = "red"
Write-Host "Step 4"
$host.ui.RawUI.ForegroundColor = "white"
certreq -accept ".\$SAN1\$dtShort\$tmShort\00certDetails$SAN1.cer"

#Script ends after installing the certificate