terraform-provider-azurerm: Error updating maintenance_window in AKS using Terraform when computed window start is in the past

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Terraform Version

1.5.4

AzureRM Provider Version

3.67.0

Affected Resource(s)/Data Source(s)

azurerm_kubernetes_cluster

Terraform Configuration

Original Configuration:
maintenance_window = {
  utc_offset = "+01:00"
  maintenance_window_auto_upgrade = {
    frequency   = "WEEKLY"
    interval    = 1
    duration    = 4
    day_of_week = "TUESDAY"
    start_time  = "19:00"
  }
  maintenance_window_node_os = {
    frequency   = "WEEKLY"
    interval    = 1
    duration    = 4
    day_of_week = "TUESDAY"
    start_time  = "15:00"
  }
  not_allowed = []
}

Updated Configuration:
maintenance_window = {
  utc_offset = "+00:00"
  maintenance_window_auto_upgrade = {
    frequency   = "WEEKLY"
    interval    = 1
    duration    = 4
    day_of_week = "TUESDAY"
    start_time  = "09:00"
  }
  maintenance_window_node_os = {
    frequency   = "WEEKLY"
    interval    = 1
    duration    = 4
    day_of_week = "TUESDAY"
    start_time  = "09:00"
  }
  not_allowed = []
}

Debug Output/Panic Output

When I apply these changes, I get the following error:

Error: creating/updating Auto Upgrade Schedule Maintenance Configuration for Kubernetes Cluster (Subscription: "redact"
Resource Group Name: "redact-aks-2"
Kubernetes Cluster Name: "redact-aks-2"): maintenanceconfigurations.MaintenanceConfigurationsClient#CreateOrUpdate: Failure responding to request: StatusCode=400 -- Original Error: autorest/azure: Service returned an error. Status=400 Code="InvalidParameter" Message="The input 'maintenanceWindow.startDate' 2023-07-31 00:00:00 +0000 cxTimeZone is before the current time 2023-08-01 09:22:31.836739265 +0000 UTC m=+127068.839937897."

with module.aks.module.cluster.azurerm_kubernetes_cluster.default,
on .terraform/redact.tf line 30, in resource "azurerm_kubernetes_cluster" "default":
30: resource "azurerm_kubernetes_cluster" "default" {

Problem/Expected Behaviour

I am experiencing an issue when attempting to update an existing maintenance_window in Azure Kubernetes Service (AKS) using Terraform version 1.5.4 and the Azure provider (azurerm) version 3.67.0. The issue occurs when running the terraform apply command, specifically when the computed window start time falls in the past.

The AKS cluster is located in a specific region and is running the latest AKS version as of 2023-07-23. I am trying to update the day and time of the maintenance window. Above are the changes I am making.

The key point of this issue is that the logic to calculate the window start date doesn’t seem to consider the current time, thereby allowing a past date to be used where only future dates should be valid. This results in a failure during the apply step.

I would greatly appreciate any insights into why this might be happening.

Extra

When modifying the maintenance window through the az command-line interface, there are no issues and the action is successful. The start date is set for as required.

Deleting the maintenance configuration and re-applying it in the past in addition has no issue

`az aks maintenanceconfiguration update -g redact-aks-2 --cluster-name redact-aks-2 --name aksManagedNodeOSUpgradeSchedule --schedule-type Weekly --day-of-week Tuesday --interval-weeks 1 --start-time 09:00 --duration 4`

Details:

  {
    "id": "/subscriptions/redact-aks-2/resourceGroups/redact-aks-2/providers/Microsoft.ContainerService/managedClusters/redact-aks-2/maintenanceConfigurations/aksManagedAutoUpgradeSchedule",
    "maintenanceWindow": {
      "durationHours": 4,
      "notAllowedDates": null,
      "schedule": {
        "absoluteMonthly": null,
        "daily": null,
        "relativeMonthly": null,
        "weekly": {
          "dayOfWeek": "Tuesday",
          "intervalWeeks": 1
        }
      },
      **"startDate": "2023-08-01",**
      "startTime": "09:00",
      "utcOffset": "+00:00"
    },
    "name": "aksManagedNodeOSUpgradeSchedule",
    "notAllowedTime": null,
    "resourceGroup": "redact-aks-2",
    "systemData": null,
    "timeInWeek": null,
    "type": null
  },