Time flow comparison

is there a way to create a dynamic time range comparison that always pull the previous selected period regardless of length. for example. if i selected in the date range for the panel june 9-june 19 the camparison would compare it to june 8th to May 29. and if i changed the date range to look at june 10-june 12 it would then compare it to june 7-june 9. does that make sense?