TU-R) Recommendation TF.460-6 (02/2002).</li>
<li><a
href="https://www.iers.org/IERS/EN/Publications/Bulletins/bulletins.html"><abbr
title="International Earth Rotation and Reference Systems Service">IERS</abbr>
Bulletins</a> contains official publications of the International
Earth Rotation and Reference Systems Service, which decides when leap
seconds occur.
The <code><abbr>tz</abbr></code> code and data support leap seconds
via an optional <code>"right"</code> configuration where a computer’s internal
