Set default starting point for Date Slicer

Good morning everyone!

I'm trying to create a date filter slicer that starts by default at a certain date, but,  without excluding the dates before that starting point. For example:

Here, the visual displays this date range, but the user can still access the previous dates. How could I do such a thing? 

One doubt of mine that might interfere into it is that if someone alters this filter (while published), will it be altered for another user, or will it be the same every time the Dashboard page is refreshed? 

Thanks!