**Example 1: To modify the time range of an event window** The following ``modify-instance-event-window`` example modifies the time range of an event window. Specify the ``time-range`` parameter to modify the time range. You can't also specify the ``cron-expression`` parameter. :: aws ec2 modify-instance-event-window \ --region us-east-1 \ --instance-event-window-id iew-0abcdef1234567890 --time-range StartWeekDay=monday,StartHour=2,EndWeekDay=wednesday,EndHour=8 Output:: { "InstanceEventWindow": { "InstanceEventWindowId": "iew-0abcdef1234567890", "TimeRanges": [ { "StartWeekDay": "monday", "StartHour": 2, "EndWeekDay": "wednesday", "EndHour": 8 } ], "Name": "myEventWindowName", "AssociationTarget": { "InstanceIds": [ "i-0abcdef1234567890", "i-0be35f9acb8ba01f0" ], "Tags": [], "DedicatedHostIds": [] }, "State": "creating", "Tags": [ { "Key": "K1", "Value": "V1" } ] } } For event window constraints, see `Considerations <https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/event-windows.html#event-windows-considerations>`__ in the Scheduled Events section of the *Amazon EC2 User Guide*. **Example 2: To modify a set of time ranges for an event window** The following ``modify-instance-event-window`` example modifies the time range of an event window. Specify the ``time-range`` parameter to modify the time range. You can't also specify the ``cron-expression`` parameter. :: aws ec2 modify-instance-event-window \ --region us-east-1 \ --instance-event-window-id iew-0abcdef1234567890 \ --time-range '[{"StartWeekDay": "monday", "StartHour": 2, "EndWeekDay": "wednesday", "EndHour": 8}, {"StartWeekDay": "thursday", "StartHour": 2, "EndWeekDay": "friday", "EndHour": 8}]' Output:: { "InstanceEventWindow": { "InstanceEventWindowId": "iew-0abcdef1234567890", "TimeRanges": [ { "StartWeekDay": "monday", "StartHour": 2, "EndWeekDay": "wednesday", "EndHour": 8 }, { "StartWeekDay": "thursday", "StartHour": 2, "EndWeekDay": "friday", "EndHour": 8 } ], "Name": "myEventWindowName", "AssociationTarget": { "InstanceIds": [ "i-0abcdef1234567890", "i-0be35f9acb8ba01f0" ], "Tags": [], "DedicatedHostIds": [] }, "State": "creating", "Tags": [ { "Key": "K1", "Value": "V1" } ] } } For event window constraints, see `Considerations <https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/event-windows.html#event-windows-considerations>`__ in the Scheduled Events section of the *Amazon EC2 User Guide*. **Example 3: To modify the cron expression of an event window** The following ``modify-instance-event-window`` example modifies the cron expression of an event window. Specify the ``cron-expression`` parameter to modify the cron expression. You can't also specify the ``time-range`` parameter. :: aws ec2 modify-instance-event-window \ --region us-east-1 \ --instance-event-window-id iew-0abcdef1234567890 \ --cron-expression "* 21-23 * * 2,3" Output:: { "InstanceEventWindow": { "InstanceEventWindowId": "iew-0abcdef1234567890", "Name": "myEventWindowName", "CronExpression": "* 21-23 * * 2,3", "AssociationTarget": { "InstanceIds": [ "i-0abcdef1234567890", "i-0be35f9acb8ba01f0" ], "Tags": [], "DedicatedHostIds": [] }, "State": "creating", "Tags": [ { "Key": "K1", "Value": "V1" } ] } } For event window constraints, see `Considerations <https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/event-windows.html#event-windows-considerations>`__ in the Scheduled Events section of the *Amazon EC2 User Guide*.