Roll-Up The Earliest Date From Related Record Date Field

In a Sugar cloud instance...Does anyone know a simple way to roll-up the earliest / minimum date (Date field) from all related records?

Not so great solution #1: Create a calculated field that coverts the date field to a number (YYYYMMDD), roll-up the minimum of that number, convert the roll-up number back to a date field.

I'm thinking there must be a better solution than that??