seconds.list</code>, which lists the currently known leap seconds.
The <abbr>IERS</abbr> maintains this file, and a copy is distributed by
<code><abbr>tzdb</abbr></code> for use by <abbr>NTP</abbr> implementations like
<a href="https://www.ntp.org">classic
<code><abbr title="Network Time Protocol Daemon">ntpd</abbr></code></a>
and <a href="https://ntpsec.org">NTPsec</a>.
The <code><abbr>tz</abbr></code> database also distributes leap second
information in a differently-formatted <code>leapseconds</code> tex