s source code is proprietary, its executable is available under the
<a href="https://www.oracle.com/a/tech/docs/tzupdater-lic.html">Java SE
Timezone Updater License Agreement</a>.</li>
<li>The <a
href="https://www.oracle.com/technetwork/articles/java/jf14-date-time-2125367.html">Java
SE 8 Date and Time</a> <abbr>API</abbr> can be supplemented by <a
href="https://www.threeten.org/threeten-extra/">ThreeTen-Extra</a>,
which is freely available under a <abbr>BSD</abbr>-style license.</li>
<li><a href="https://w