HPE – Leap Second Information Page

The leap second

The leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to compensate for the Earth's slowing rotation. There were close to 26 leap seconds added since 1972. The last one happened on 30 June 2015 at 23:59:60 UTC and a similar leap second will be added this year at the end of 31 December 2016 at 23:59:60 UTC.

When the leap second was introduced on June 30, 2012, some computer systems experienced technical problems due to an issue with how the Linux operating system handled the Network Time Protocol's introduction of the leap second.

These issues have been addressed in updates to the Linux operating system.

For additional information on the effects of the leap second on the operating system, refer to the operating system vendor.

References:
International Earth Rotation and Reference Systems Service (IERS) Announcement of 2016 Leap Second Addition

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