A libdatetime-timezone-perl new upstream version has been released for Debian GNU/Linux 9 LTS.

DLA 2543-1: libdatetime-timezone-perl new upstream version

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Debian LTS Advisory DLA-2543-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
February 02, 2021   https://wiki.debian.org/LTS
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Package : libdatetime-timezone-perl
Version : 1:2.09-1+2021a

This update includes the changes in tzdata 2021a for the
Perl bindings. For the list of changes, see DLA-2542-1.

For Debian 9 stretch, this problem has been fixed in version
1:2.09-1+2021a.

We recommend that you upgrade your libdatetime-timezone-perl packages.

For the detailed security status of libdatetime-timezone-perl please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/libdatetime-timezone-perl

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS