[ { "type": "api-change", "category": "SSM", "description": "Adds StartDate, EndDate, and ScheduleTimezone to CreateMaintenanceWindow and UpdateMaintenanceWindow; Adds NextExecutionTime to GetMaintenanceWindow and DescribeMaintenanceWindows; Adds CancelMaintenanceWindowExecution, DescribeMaintenanceWindowSchedule and DescribeMaintenanceWindowsForTarget APIs." } ]