<p>Modifies the specified event window.</p> <p>You can define either a set of time ranges or a cron expression when modifying the event window, but not both.</p> <p>To modify the targets associated with the event window, use the <a>AssociateInstanceEventWindow</a> and <a>DisassociateInstanceEventWindow</a> API.</p> <p>If Amazon Web Services has already scheduled an event, modifying an event window won't change the time of the scheduled event.</p> <p>For more information, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/event-windows.html">Define event windows for scheduled events</a> in the <i>Amazon EC2 User Guide</i>.</p>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}