# Implement change controls for Automation
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By default, Automation lets you use runbooks without date and time constraints. By integrating Automation with Change Calendar, you can implement change controls to all automations in your Amazon Web Services account. With this setting, Amazon Identity and Access Management (IAM) principals in your account can only run automations during allowed time periods. To learn more about working with Change Calendar, see [Working with Change Calendar](systems-manager-change-calendar-working.md).

**To turn on change controls (console)**

1. Open the Amazon Systems Manager console at [https://console.amazonaws.cn/systems-manager/](https://console.amazonaws.cn/systems-manager/).

1. In the navigation pane, choose **Automation**.

1. Choose the **Preferences** tab, and then choose **Edit**.

1. Select the check box next to **Turn on Change Calendar integration**.

1. In the **Choose a change calendar** dropdown list, choose the change calendar that you want Automation to follow.

1. Choose **Save**.