Remove expired runbookschedules from an Azure automation account

Remove-AzurermExpiredSchedules.ps1

<#
.SYNOPSIS
    This script removes expired schedules from a runbookaccount.
.DESCRIPTION
    The script finds schedules that were scheduled onetime and don't have a next runtime.
    All schedules that meet the criteria will be removed.
    .EXAMPLE
    .\Remove-OldSchedules.ps1 -AutomationAccountName "OGD-EUW-AUT-OPL-AUTOMATION-01"
.NOTES
    Script was created to be used as a scheduled runbook.
#>

param(
    [Parameter(Mandatory = $true)]
    [String]$AutomationAccountName
)

# Get the resourcegroup of the automation account
$AAResourceGroup = (Get-AzureRmResource -Name $AutomationAccountName).ResourceGroupName

# Get the schedules that have run once and have no NextRun-time set.
$Schedules = Get-AzureRmAutomationSchedule -ResourceGroupName $AAResourceGroup -AutomationAccountName $AutomationAccountName |
    Where-Object {$_.Frequency -eq "Onetime" -and $null -eq $_.NextRun}
Write-Verbose "$($Schedules.Count) expired Schedules found"
foreach ($Schedule in $Schedules) {
    try {
        Remove-AzureRmAutomationSchedule -Name $Schedule.Name -ResourceGroupName $AAResourceGroup -AutomationAccountName $AutomationAccountName -force -ErrorAction Stop
        Write-Output "$($Schedule.Name) has been removed"
    }
    catch {
        Write-Error $_
        continue
    }
}