<leap-seconds>

  <!-- Leap seconds at 23:59:60 since 1970    -->
  
  <leap-second date="1972-06-30"/>
  <leap-second date="1972-12-31"/>
  <leap-second date="1973-12-31"/>
  <leap-second date="1974-12-31"/>
  <leap-second date="1975-12-31"/>
  <leap-second date="1976-12-31"/>
  <leap-second date="1977-12-31"/>
  <leap-second date="1978-12-31"/>
  <leap-second date="1979-12-31"/>
  
  <leap-second date="1981-06-30"/>
  <leap-second date="1982-06-30"/>
  <leap-second date="1983-06-30"/>
  <leap-second date="1985-06-30"/>
  <leap-second date="1987-12-31"/>
  <leap-second date="1989-12-31"/>

  <leap-second date="1990-12-31"/>
  <leap-second date="1992-06-30"/>
  <leap-second date="1993-06-30"/>
  <leap-second date="1994-06-30"/>
  <leap-second date="1995-12-31"/>
  <leap-second date="1997-06-30"/>
  <leap-second date="1998-12-31"/>

  <leap-second date="2005-12-31"/>
  <leap-second date="2008-12-31"/>

  <leap-second date="2012-06-30"/>
  <leap-second date="2015-06-30"/>
  <leap-second date="2016-12-31"/>

</leap-seconds>
