diff --git a/.gitignore b/.gitignore
index 947b742..68c1671 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /DateTime-TimeZone-[0-9.]*.tar.gz
+/tzdata2017b.tar.gz
diff --git a/perl-DateTime-TimeZone.spec b/perl-DateTime-TimeZone.spec
index 1e18c5e..937898a 100644
--- a/perl-DateTime-TimeZone.spec
+++ b/perl-DateTime-TimeZone.spec
@@ -1,11 +1,21 @@
+# Regenerate Perl library code from upstream Olson database of this date
+%global tzversion 2017b
+
 Name:           perl-DateTime-TimeZone
 Version:        2.13
 Release:        4%{?dist}
 Summary:        Time zone object base class and factory
-License:        GPL+ or Artistic
+# tzdata%%{tzversion}.tar.gz archive:   Public Domain
+# other files:                          GPL+ or Artistic
+# Some other files are generated from tzdata%%{tzversion}.tar.gz content by
+# upstream or locally:                  Public Domain
+License:        (GPL+ or Artistic) and Public Domain
 Group:          Development/Libraries
 URL:            http://search.cpan.org/dist/DateTime-TimeZone/
 Source0:        http://www.cpan.org/authors/id/D/DR/DROLSKY/DateTime-TimeZone-%{version}.tar.gz
+%if %{defined tzversion}
+Source1:        ftp://ftp.iana.org/tz/releases/tzdata%{tzversion}.tar.gz
+%endif
 # Parse local time zone definition from /etc/localtime as before giving up,
 # bug #1135981, CPAN RT#55029
 Patch0:         DateTime-TimeZone-2.04-Parse-etc-localtime-by-DateTime-TimeZone-Tzfile.patch
@@ -17,6 +27,22 @@ BuildRequires:  perl-generators
 BuildRequires:  perl(ExtUtils::MakeMaker) >= 6.76
 BuildRequires:  perl(strict)
 BuildRequires:  perl(warnings)
+%if !%{defined perl_bootstrap} && %{defined tzversion}
+# Avoid circular dependencies - perl-DateTime strictly requires DateTime::TimeZone
+BuildRequires:  perl(Data::Dumper)
+BuildRequires:  perl(DateTime)
+BuildRequires:  perl(File::Copy)
+BuildRequires:  perl(File::Find::Rule)
+BuildRequires:  perl(File::Path)
+BuildRequires:  perl(File::Spec)
+BuildRequires:  perl(Getopt::Long)
+BuildRequires:  perl(integer)
+BuildRequires:  perl(lib)
+BuildRequires:  perl(List::Util)
+BuildRequires:  perl(Locale::Country) >= 3.11
+BuildRequires:  perl(Parallel::ForkManager)
+BuildRequires:  sed
+%endif
 # Runtime
 BuildRequires:  perl(Class::Singleton) >= 1.03
 BuildRequires:  perl(constant)
@@ -64,6 +90,11 @@ Requires:       perl(File::Find)
 # Require optional DateTime::TimeZone::Tzfile to work in mock after tzdata
 # upgrade, bug #1135981
 Requires:       perl(DateTime::TimeZone::Tzfile)
+%if !%{defined perl_bootstrap} && %{defined tzversion}
+Provides:       bundled(tzdata) = %{tzversion}
+%else
+Provides:       bundled(tzdata)
+%endif
 
 # Remove under-specified dependencies
 %global __requires_exclude %{?__requires_exclude:%__requires_exclude|}^perl\\(Class::Singleton\\)$
@@ -79,10 +110,18 @@ represented internally as a set of observances, each of which describes the
 offset from GMT for a given time period.
 
 %prep
-%setup -q -n DateTime-TimeZone-%{version}
+%if !%{defined perl_bootstrap} && %{defined tzversion}
+%setup -q -T -b 1 -c -n tzdata-%{tzversion}
+%endif
+%setup -q -T -b 0 -n DateTime-TimeZone-%{version}
 %patch0 -p1
 
 %build
+%if !%{defined perl_bootstrap} && %{defined tzversion}
+JOBS=$(printf '%%s' "%{?_smp_mflags}" | sed 's/.*-j\([0-9][0-9]*\).*/\1/')
+perl tools/parse_olson --dir ../tzdata-%{tzversion} --version %{tzversion} \
+    --jobs $JOBS --clean
+%endif
 perl Makefile.PL INSTALLDIRS=vendor NO_PACKLIST=1
 make %{?_smp_mflags}
 
@@ -102,6 +141,7 @@ make test
 %changelog
 * Thu Jul 20 2017 Petr Pisar <ppisar@redhat.com> - 2.13-4
 - Specify all dependencies
+- Regenerate Perl code from timezone sources (bug #1101251)
 
 * Wed Jun 07 2017 Jitka Plesnikova <jplesnik@redhat.com> - 2.13-3
 - Perl 5.26 re-rebuild of bootstrapped packages
diff --git a/sources b/sources
index 7e9531f..44b3b8e 100644
--- a/sources
+++ b/sources
@@ -1 +1,2 @@
 SHA512 (DateTime-TimeZone-2.13.tar.gz) = 6003b2b6044c35a7c75840cf550d1f68500c1d762dc0ebdcf22e1714b68804382d2d969512d183c460fe89fe2fdbd8037463594536d6c3acee0ccf79734ac654
+SHA512 (tzdata2017b.tar.gz) = 3e090dba1f52e4c63b4930b28f4bf38b56aabd6728f23094cb5801d10f4e464f17231f17b75b8866714bf98199c166ea840de0787b75b2274aa419a4e14bbc4d