Creates or updates a scheduled scaling action for an Auto Scaling group. When updating a scheduled scaling action, if you leave a parameter unspecified, the corresponding value remains unchanged in the affected Auto Scaling group.
For information on creating or updating a scheduled action for your Auto Scaling group, see Scale Based on a Schedule .
NOTE: Auto Scaling supports the date and time expressed in "YYYY-MM-DDThh:mm:ssZ" format in UTC/GMT only.