[Koha] Publication date (yyyy-yyyy) advanced search option not working in my Koha instance

[Cindy Murdock Ames]

Hi all,

We recently upgraded to 20.05.08 from 19.11, and we've found that the
advanced search option in the staff interface for publication date by year
range isn't producing any results for us if we use it.  Specifying it with
y,st-year in the keyword search instead *does* produce results though.

Does anyone have any ideas what might cause this?  I've tested it on
Bywater's demo, which is running 20.05.04, and it does work there, so I'm
guessing it's some quirk specific to our system rather than an actual bug
(unless it happened to be introduced between the .04 and .08 releases).
Here's our server specs:

Koha version: 20.05.08.000
OS version ('uname -a'): Linux ccflskoha.ccfls.org 4.15.0-135-generic
#139-Ubuntu SMP Mon Jan 18 17:38:24 UTC 2021 x86_64
Perl interpreter: /usr/bin/perl
Perl version: 5.026001
Perl @INC: /usr/share/koha/lib
/usr/share/koha/installer
/usr/share/koha/lib/installer
/etc/perl
/usr/local/lib/x86_64-linux-gnu/perl/5.26.1
/usr/local/share/perl/5.26.1
/usr/lib/x86_64-linux-gnu/perl5/5.26
/usr/share/perl5
/usr/lib/x86_64-linux-gnu/perl/5.26
/usr/share/perl/5.26
/usr/local/lib/site_perl
/usr/lib/x86_64-linux-gnu/perl-base
/var/lib/koha/ccfls/plugins
MySQL version: mysql Ver 15.1 Distrib 10.4.17-MariaDB, for debian-linux-gnu
(x86_64) using readline 5.2
Apache version: Server version: Apache/2.4.29 (Ubuntu)
PSGI: Plack (deployment)
Memcached: Servers: 127.0.0.1:11211 | Namespace: koha_ccfls | Status:
running. | Config read from: koha-conf.xml
Zebra version: Zebra 2.0.59 (C) 1994-2014, Index Data Zebra is free
software, covered by the GNU General Public License, and you are welcome to
change it and/or distribute copies of it under certain conditions. SHA1 ID:
c00bfddbf0f3608340d61298acc61dafb167f9b2 Using ICU
Date and time: 02/04/2021 11:16
Time zone: Used: America/New_York | Config: Undefined | Environment (TZ):
Undefined

Many thanks,
Cindy

-----------------------------------------------------------
Cindy Murdock Ames
IT Services Director
Meadville Public Library | CCFLS
https://meadvillelibrary.org | https://ccfls.org