Thanks to Info-ZIP for info on the DOS-time/date conversion code,
and some other general information gathered from their sources.

Thanks to these people for suggestions, testing, and bug reports:

ag2s20150909
Agostino Sarubbo
Alberto Spin
Alexander Galanin <al@galanin.nnov.ru>
Alexandr Shadchin <alexandr.shadchin@gmail.com>
Alexey Bykov <gnfalex@rambler.ru>
Andreas Deininger <andreas@deininger.net>
Andreas Falkenhahn <andreas@falkenhahn.com>
Andrew Brampton <brampton@gmail.com>
Andrew Molyneux <andrew@molyneuxfamily.co.uk>
Ankur Kothari <ankz.kothari@gmail.com>
Antonin Décimo <antonin.decimo@gmail.com>
Arseniy Terekhin <senyai@gmail.com>
BALATON Zoltan <balaton@eik.bme.hu>
Benjamin Gilbert <bgilbert@backtick.net>
Beuc <beuc@beuc.net>
Boaz Stolk <bstolk@aweta.nl>
Bogdan <bogiebog@gmail.com>
Brian 'geeknik' Carpenter <geeknik@protonmail.ch>
BruceFan <fanrong_1992@163.com>
Carl Mastrangelo <notcarl@google.com>
Cédric Tabin
celan69
chaoticgd
Charlie Li <git@vishwin.info>
Chris Nehren <cnehren+libzip@pobox.com>
Christoph Cullmann <cullmann@kde.org>
Christoph M. Becker <cmbecker69@gmx.de>
Coverity <info@coverity.com>
cryi <cryi@tutanota.com>
ctenter-scs
Dane Springmeyer <dane.springmeyer@gmail.com>
Daniel Russel <drussel@gmail.com>
Ларионов Даниил <scumcoder@yandex.ru>
David Demelier <demelier.david@gmail.com>
Dean Ellis <dellis1972@googlemail.com>
Declan Moran
Del Merritt <del@alum.mit.edu>
Devin Davila <daviladsoftware@gmail.com>
Dmytro Rybachenko <atmoliton@gmail.com>
Dylan T. <dktapps@pmmp.io>
Eelco Dolstra
Elvis Angelaccio
Erwin Haid <erwin.haid@gmx.de>
Eun-cheol Joo
Fabrice Fontaine
Filip Niksic
Florian Delizy <florian.delizy@gmail.com>
Force Charlie <charlieio@outlook.com>
François Simon <AT.GFI.Francois.SIMON@sesam-vitale.fr>
Frederik Ramm <frederik@remote.org>
Gabriela Gutierrez <gabigutierrez@google.com>
Gerard ODonnell
Giovanni
gk7huki <gk7huki@gmail.com>
Hanno Böck <hanno@hboeck.de>
HeeMyung
Heiko Becker
Heiko Hund <heiko@ist.eigentlich.net>
hongjunwang
Ilya Voronin
Info-ZIP group
Ivan Kolesnikov <kiv.apple@gmail.com>
Jan Weiß <jan@geheimwerk.de>
Jay Freeman (saurik) <saurik@saurik.com>
jloqfjgk@github
Joachim Reichel <joachim.reichel@gmx.de>
João Custódio <joao_custodio@symantec.com>
Joel Ebrahimi <joel.ebrahimi@gmail.com>
Jono Spiro <jono.spiro@gmail.com>
Julien Matthey <julien@turtlespeak.net>
Julien Schueller <schueller@phimeca.com>
Justin Cohen <justincohen@google.com>
kensington <kensington@gentoo.org>
Keith Jones <keith@keithjjones.com>
Khaled Mardam-Bey
Kohei Yoshida <kohei.yoshida@gmail.com>
Krzesimir Nowak <qdlacz@gmail.com>
Leith Bade <leith@mapbox.com>
Lubomir I. Ivanov <neolit123@gmail.com>
Lucas Bustamante
Ludovic LANGE
M. Reiningħaus
Maël Nison
Manuel Massing <m.massing@virtualities.de>
Marcin Kowalczyk <QrczakMK@gmail.com>
Mark A. Tsuchida <marktsuchida@gmail.com>
Martin Buchholz <martinrb@google.com>
Martin Herkt <lachs0r@srsfckn.biz>
Martin Szulecki <m.szulecki@libimobiledevice.org>
Michael Balzer
Michael Beck <mm.beck@gmx.net>
Michael Heimpold <mhei@heimpold.de>
Michał Janiszewski <janisozaur+libzip@gmail.com>
Michal Vyskocil <mvyskocil@suse.cz>
Mikhail Gusarov <dottedmag@dottedmag.net>.
Miklos Vajna
Morris Hafner
Muhammad Arslan Kabeer
Oliver Kaiser <under.northern.sky@googlemail.com>
Oliver Kuckertz <oliver.kuckertz@mologie.de>
OSS-Fuzz Team
Ørjan Malde <red@foxi.me>
Pascal Terjan <pterjan@gmail.com>
Patrick Spendrin <ps_ml@gmx.de>
Paul Harris <harris.pc@gmail.com>
Paul Sheppard <shepsoft@googlemail.com>
Pavel Raiskup <praiskup@redhat.com>
Pierre Joye <pierre.php@gmail.com>
Pierre Wendling <pierre.wendling.4@gmail.com>
Pierre-Louis Cabelguen <plcabelguen@googlemail.com>
PW Hu <jlu.hpw@foxmail.com>
Rafał Mikrut
ralfjunker
Randy <randy408@protonmail.com>
Remi Collet <remi@fedoraproject.org>
rezso <rezso@rezso.net>
Richard Schütz
Rick Carback <carback1@umbc.edu>
Rikard Falkeborn <rikard.falkeborn@gmail.com>
Robert Norris <rw_norris@hotmail.com>
Roberto Tirabassi <rtirabassi@3di.it>
robhz786 <robhz786@gmail.com>
Roland Ortloff <Ortloff.R@gmx.de>
Rosen Penev <rosenp@gmail.com>
Rudi Heitbaum
Ryan Burns <rtburns@protonmail.com>
Sam Sappenfield
scribam
Sebastian Kemper <sebastian_ml@gmx.net>
Sebastian Schmitt <sebastian.schmitt@auvesy.de>
Sergei Ozerov <ru.programmist@gmail.com>
shenlebantongying
Shimi
Simon Talbot <simont@nse.co.uk>
SpaceIm
Stephen Bryant <steve@bawue.de>
Tabata Shintaro <tabata.shintaro@gmail.com>
Tarmo Pikaro <tapika@yahoo.com>
Taylor C. Richberger
TC
Thomas Debesse <dev@illwieckz.net>
Tim Lunn <Tim@feathertop.org>
Timo Warns <warns@pre-sense.de>
Timofey
Tom Callaway <tcallawa@redhat.com>
Tomas Hoger <thoger@redhat.com>
Tomáš Malý <malytomas@ucpu.cz>
Torsten Paul <Torsten.Paul@gmx.de>
Transporter <ogre.transporter@gmail.com>
Vassili Courzakis <vcoxvco@googlemail.com>
Vinpasso
Vitaly Murashev <vitaly.murashev@gmail.com>
William Lee
William Ouwehand <mail@syncoda.nl>
Wojciech Michalski <wmichalski@quay.pl>
Wolfgang Glunz <Wolfgang.Glunz@gmx.de>