DateTime::LeapSecond(3)

NAME
DateTime::LeapSecond - leap seconds table and utilities

VERSION
version 1.66

SYNOPSIS
    use DateTime;
    use DateTime::LeapSecond;

    print "Leap seconds between years 1990 and 2000 are ";
    print DateTime::Leapsecond::leap_seconds($utc_rd_2000)
        - DateTime::Leapsecond::leap_seconds($utc_rd_1990);

DESCRIPTION
This module is used to calculate leap seconds for a given Rata Die day. It is used when DateTime cannot compile the XS version of this code.

This library is known to be accurate for dates until Jun 2020.

There are no leap seconds before 1972, because that's the year this system was implemented.

•   leap_seconds($rd)

    Returns the number of accumulated leap seconds for a given day.

•   extra_seconds($rd)

    Returns the number of leap seconds for a given day, in the range -2 .. 2.

•   day_length($rd)

    Returns the number of seconds for a given day, in the range 86398 .. 86402.

SEE ALSO
<http://hpiers.obspm.fr/eop-pc/earthor/utc/leapsecond.html>

SUPPORT
Bugs may be submitted at <https://github.com/houseabsolute/DateTime.pm/issues>.

There is a mailing list available for users of this distribution, <mailto:datetime@perl.org>.

SOURCE
The source code repository for DateTime can be found at <https://github.com/houseabsolute/DateTime.pm>.

AUTHOR
Dave Rolsky <autarch@urth.org>

COPYRIGHT AND LICENSE
This software is Copyright (c) 2003 - 2025 by Dave Rolsky.

This is free software, licensed under:

  The Artistic License 2.0 (GPL Compatible)

The full text of the license can be found in the LICENSE file included with this distribution.