Schedule Automation Plan

We are trying to Setup Automation plans that runs every month by itself. Scheduler on Automation Plan Screen only allows one time setup to Set Start . We like to have Each month same day kind of. Is there any option other than API calls to make it work.
Any help with reference to API also helps

@muralidhar, presently the only mechanism would be a REST API integration. Documentation on the SA REST API is available at

Thanks a lot for reply