Amazon EC2 now provides customers the flexibility to specify weekly recurring time window(s) for Scheduled Events that reboot, stop or terminate EC2 instances. AWS schedules infrequent events, such as a reboot, stop, or termination, for EC2 instances when it detects irreparable failure of the underlying host or when it must perform tasks such as maintaining the underlying host. With the flexibility to specify event windows, customers can set up Scheduled Events for their EC2 instances to occur during off-peak periods. Customers can also align these time windows with their internal maintenance schedules. Software vendors can leverage this capability to customize time windows for scheduled events based on their customers’ preferences.
Source:: Amazon AWS