[Koha-bugs] [Bug 24807] Add "year" type to improve sorting by publication date

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=24807

--- Comment #7 from David Gustafsson <glasklas at gmail.com> ---
Hi! Sorry about the late reply. Thank you very much for considering my patch. I
am a little bit unfamiliar with conventions with regards to marc record dates
and did not anything like c1964 in my testing data, is "c" in this case for
copyright? Is "u" some kind of convention that should have a special case? I
think there is another callback option "value_callbacks" that can be used for
preprocessing values before filtering, for example replace "u" with "0", and
strip other characters. I can update the patch using this approach later today,
I think it is a little bit semantically to perform filtering and transformation
in different steps.

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