range_to

 - filtertype: period
   source: name
   range_from: -1
   range_to: -1
   timestring: '%Y.%m.%d'
   unit: days

range_from and range_to are counters of whole units. A negative number indicates a whole unit in the past, while a positive number indicates a whole unit in the future. A 0 indicates the present unit.

Read more about this setting in context in the period filtertype documentation, including examples.