Current State:

Although it's possible to configure a Start time and End time for a rotation, you can't configure it to follow the same period for the next year.

For example, you want as set number of agents to be on the schedule from Jan to Jun, and another set to be on-call from July to Dec. Although you can have two rotations, one for each period, each year you'll need to manually update them.
 

Proposed Future State:

Have an option to repeat/re-use the rotation period in other years.