1. A system for determining a relevancy ranking score, comprising: a processor; and a memory coupled with the processor, wherein the memory is configured to provide the processor with instructions which when executed cause the processor to: receive an indication of a selection that a relevancy ranking score is to be tuned to a selected preference; and update a relevancy ranking score algorithm based at least in part on the indication of the selection of the selected preference, wherein the relevancy ranking score of a search result resulting from a search query is based at least in part on one or more constraints of the search query, wherein the relevancy ranking score of the search result is based at least in part on a currency score of the search result, wherein the currency score comprises a score indicating recent results relative to a date of interest associated with the search query, wherein the currency score is based at least in part on a currency function evaluating a date attribute, and wherein updating the relevancy ranking score includes adjusting a peak, a width, and a shape of the currency function, wherein the peak corresponds to a date of interest, wherein the width corresponds to an appropriate time scale width, and wherein the shape of the currency function includes a peaked shape.