This setting is only used with the period filtertype
- 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
Read more about this setting in context in the period filtertype documentation, including examples.