Hey there,
I used Google translation to understand your question, I hope there’s nothing lost in translation. You can indeed save date ranges in your database. However, in my experience, it has been easier to create two fields as “start date” and “end date” rather saving it as a date range. If you need to use a date range on the front end you can calculate the range easily by doing end date minus the start date. Is there any particular reason why you can’t do that? Regardless, you can still save date ranges.
All the best,