valid date range on calendar component

I’m trying to speed up loading of a calendar component. 

Just noticed this option “Valid Date Range”, which looks like you can tie it to a single model in your page and establish Start and End Dates for the calendar through that single model.

I can’t find any documentation on this feature however, so just wanted to get some clarification on whether I’m interpreting this correclty.

Also, I tried using an UI-Only model with 2 date format fields for start and end date, but it wouldn’t allow me to tie the Valid Date Range back to these UI-only fields.