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perl-DateTime-1.04-5.el7.x86_64 does not support leap second the will be added to 2016-12-31 day:

$ perl -MDateTime -e 'print DateTime->new(year=>2016, month=>12, day=>31, hour=>23, minute=>59, second=>59, time_zone=>q{UTC})->add(seconds=>1), qq{\n}'
2017-01-01T00:00:00

Expected result:

$ perl -MDateTime -e 'print DateTime->new(year=>2016, month=>12, day=>31, hour=>23, minute=>59, second=>59, time_zone=>q{UTC})->add(seconds=>1), qq{\n}'
2016-12-31T23:59:60

This fixed in upstream DateTime-1.34.

Created attachment 1177257 [details]
First part: Add 2015-06-30 leap second

Created attachment 1177258 [details]
Second part: Add 2016-12-31 leap second

Don't forget to execute ./tools/leap_seconds_header.pl in the spec file to update XS implementation:

 BuildRequires:  perl
+BuildRequires:  perl(autodie)
+BuildRequires:  perl(integer)
+BuildRequires:  perl(lib)
 BuildRequires:  perl(Module::Build)
 BuildRequires:  perl(strict)
 BuildRequires:  perl(warnings)
@@ -55,6 +62,9 @@ believed to be the birth of Jesus Christ.
 
 %prep
 %setup -q -n DateTime-%{version}
+%patch0 -p1
+%patch1 -p1
+./tools/leap_seconds_header.pl

How to test:

1) Run command:
  $ perl -MDateTime -e 'print DateTime->new(year=>2016, month=>12, day=>31, hour=>23, minute=>59, second=>59, time_zone=>q{UTC})->add(seconds=>1), qq{\n}'

2) Check output
Before:
2017-01-01T00:00:00

After:
2016-12-31T23:59:60

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:1923