Clean-up MIM History in PowerShell

function CleanUpMimHistory ()
{
 $computerName = "."
 $MIMHistory = Get-Wmiobject -Class 'MIIS_RunHistory' -namespace “root\MicrosoftIdentityIntegrationServer”
 $MIMServer = Get-Wmiobject -Class "MIIS_Server" -Namespace "root\MicrosoftIdentityIntegrationServer" -ComputerName $computerName -ErrorAction SilentlyContinue

 # I configured the number of days in a separated XML file but for the example we will set up in the function
 $daysBeforeHistoryPurge = 15 #$XmlDocument.MIM.'global-settings'.daysBeforeHistoryPurge 

 $endingBefore = [System.DateTime]::UtcNow.AddDays(-$daysBeforeHistoryPurge).ToString("yyyy-MM-dd HH:mm:ss.fff")

 # Clear MA runs History
 try
 {
 Write-Host ("[DEBUG] - Clearing MIM run history older than " + $daysBeforeHistoryPurge + " days")
 $clearRunHistory = $MIMServer.ClearRuns($endingBefore) # Purging
 Write-Host ("[DEBUG] - Status of the clearing operation : " + $clearRunHistory.ReturnValue)
 }
 catch
 {
 # Problem : displaying the Exception and Breaking the execution if needed
 Write-Host $($_.Exception.Message)
 Write-Host ("[ERROR] - Problem during the clear of the MIM runs history")
 Break
 }
}