[Koha] Search -- doing comparisons on acquisition date

[Barton Chittenden]

I'm trying to figure out how to do date comparisons based on Acquisition
date.

The best information that I have is here:

http://manual.koha-community.org/3.18/en/searchguide.html#searchguide-syntax

Using the following pattern found in the documentation:

su=supreme court and yr,st-numeric=>2000

I constructed the following search, which should have returned results:

cgi-bin/koha/opac-search.pl?idx=acqdate,st-date-normalized&q=>2015-08-01

I have bibs indexed that have acquisition dates greater than 2015-08-01,
but this returned the followng:

   Results of search for 'acqdate,st-date-normalized: >2015-08-01'
   No results found!

I believe that date comparisons should be possible using CCL, according to
what I've been able to glean from indexdata

I must be missing somthing here...

Thanks,

--Barton