ode> configuration,
and to
1972-07-01 00:00:00 <abbr>UTC</abbr> in the <code>"posix"</code> configuration.
In practice the two configurations also agree for timestamps before
1972 even though the historical situation is messy, partly because
neither <abbr>UTC</abbr> nor <abbr>TAI</abbr>
is well-defined for sufficiently old timestamps.</li>
<li><a href="https://kb.meinbergglobal.com/kb/time_sync/ntp/configuration/ntp_leap_second_file">The
<abbr>NTP</abbr> Leap Second File</a> covers the text file
<code>leap-