Leap Second Historical Log

Review all the dates where the IERS added an artificial leap second to UTC.

Historical Leap Seconds (UTC)

1972-06-30

1972-12-31

1973-12-31

1974-12-31

1975-12-31

1976-12-31

1977-12-31

1978-12-31

1979-12-31

1981-06-30

1982-06-30

1983-06-30

1985-06-30

1987-12-31

1989-12-31

1990-12-31

1992-06-30

1993-06-30

1994-06-30

1995-12-31

1997-06-30

1998-12-31

2005-12-31

2008-12-31

2012-06-30

2015-06-30

2016-12-31

* The IERS has announced plans to discontinue the leap second system by 2035.

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