ModifyInstanceEventWindow - Amazon Elastic Compute Cloud
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Modifies the specified event window.

You can define either a set of time ranges or a cron expression when modifying the event window, but not both.

To modify the targets associated with the event window, use the AssociateInstanceEventWindow and DisassociateInstanceEventWindow API.

If Amazon has already scheduled an event, modifying an event window won't change the time of the scheduled event.

For more information, see Define event windows for scheduled events in the Amazon EC2 User Guide.

Request Parameters

The following parameters are for this specific action. For more information about required and optional parameters that are common to all actions, see Common Query Parameters.


The cron expression of the event window, for example, * 0-4,20-23 * * 1,5.


  • Only hour and day of the week values are supported.

  • For day of the week values, you can specify either integers 0 through 6, or alternative single values SUN through SAT.

  • The minute, month, and year must be specified by *.

  • The hour value must be one or a multiple range, for example, 0-4 or 0-4,20-23.

  • Each hour range must be >= 2 hours, for example, 0-2 or 20-23.

  • The event window must be >= 4 hours. The combined total time ranges in the event window must be >= 4 hours.

For more information about cron expressions, see cron on the Wikipedia website.

Type: String

Required: No


Checks whether you have the required permissions for the action, without actually making the request, and provides an error response. If you have the required permissions, the error response is DryRunOperation. Otherwise, it is UnauthorizedOperation.

Type: Boolean

Required: No


The ID of the event window.

Type: String

Required: Yes


The name of the event window.

Type: String

Required: No


The time ranges of the event window.

Type: Array of InstanceEventWindowTimeRangeRequest objects

Required: No

Response Elements

The following elements are returned by the service.


Information about the event window.

Type: InstanceEventWindow object


The ID of the request.

Type: String


For information about the errors that are common to all actions, see Common client error codes.

See Also

For more information about using this API in one of the language-specific Amazon SDKs, see the following: