We're using the apachesolr 2.x and the companion apachesolr_date module to handle faceted searching on Drupal 6. We need to extend the current date drilldown to display a quarter under each year. Currently the dates are drilled down by Year, Month and then Day. We'd like to show Quarters (Abbreviated as 'Q1', 'Q2,' 'Q3' and 'Q4') after the Year. So that you can select an entire quarter at a time and months are grouped by quarter. The deliverable is to be a standalone module that provides the new drilldown functionality. This module should extend the apachesolr_date module as desired, or replace it completely if required. It is acceptable if this module handles all dates in the same manner. Please see the attached image for a mockup of current and desired functionality.