Backing up Bitlocker Keys and LAPS passwords from Active Directory

function Get-WinADDomainBitlocker {
    param(
        [string] $Domain = $Env:USERDNSDOMAIN,
        [Array] $Computers
    )
    $Properties = @(
        'Name',
        'OperatingSystem',
        'DistinguishedName'
    )
    #[DateTime] $CurrentDate = Get-Date

    if ($null -eq $Computers) {
        $Computers = Get-ADComputer -Filter * -Properties $Properties -Server $Domain
    }
    foreach ($Computer in $Computers) {
        $Bitlockers = Get-ADObject -Filter 'objectClass -eq "msFVE-RecoveryInformation"' -SearchBase $Computer.DistinguishedName -Properties 'WhenCreated', 'msFVE-RecoveryPassword' #|  Sort-Object whenCreated -Descending #| Select-Object whenCreated, msFVE-RecoveryPassword
        
        foreach ($Bitlocker in $Bitlockers) {
            [PSCustomObject] @{
                'Name'                        = $Computer.Name
                'Operating System'            = $Computer.'OperatingSystem'
                'Bitlocker Recovery Password' = $Bitlocker.'msFVE-RecoveryPassword'
                'Bitlocker When'              = $Bitlocker.WhenCreated
                'DistinguishedName'           = $Computer.'DistinguishedName'
            }
        }
    }
}

$MyBitlocker = Get-WinADDomainBitlocker
$MyBitlocker | Format-Table -AutoSize


# Exporting to  Excel 
# Install-Module PSWriteExcel # is required
ConvertTo-Excel -FilePath 'C:\myFile.xlsx' -DataTable $MyBitlocker -AutoFilter -AutoFit -ExcelWorkSheetName 'Bitlocker Keys'

function Convert-TimeToDays {
    [CmdletBinding()]
    param (
        $StartTime,
        $EndTime,
        #[nullable[DateTime]] $StartTime,
        #[nullable[DateTime]] $EndTime,
        [string] $Ignore = '*1601*'
    )
    if ($StartTime -and $EndTime) {
        try {
            if ($StartTime -notlike $Ignore -and $EndTime -notlike $Ignore) {
                $Days = (NEW-TIMESPAN -Start (GET-DATE) -End ($EndTime)).Days
            } else {
                $Days = $null
            }
        } catch {
            $Days = $null
        }
    }
    return $Days
}

function Convert-ToDateTime {
    [CmdletBinding()]
    param (
        [string] $Timestring,
        [string] $Ignore = '*1601*'
    )
    Try {
        $DateTime = ([datetime]::FromFileTime($Timestring))
    } catch {
        $DateTime = $null
    }
    if ($null -eq $DateTime -or $DateTime -like $Ignore) {
        return $null
    } else {
        return $DateTime
    }
}