FreeBSD Support for Leap Seconds

Last modified on 2015-06-29 16:41:41Z by wblock.
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Table of Contents
1. Introduction
2. Default Leap Second Handling on FreeBSD
3. Cautions
4. Testing
5. Conclusion

1. Introduction

A leap second is an ad-hoc one-second correction to synchronize atomic timescales with Earth rotation. This article describes how FreeBSD interacts with leap seconds.

As of this writing, the next leap second will occur at 2015-Jun-30 23:59:60 UTC. This leap second will occur during a business day for North and South America and the Asia/Pacific region.

Leap seconds are announced by IERS on Bulletin C.

Standard leap second behavior is described in RFC 7164. Also see time2posix(3).

All FreeBSD documents are available for download at http://ftp.FreeBSD.org/pub/FreeBSD/doc/

Questions that are not answered by the documentation may be sent to <freebsd-questions@FreeBSD.org>.
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