[tz] leap second insertions

[Tony Finch]

Nathan Justus <nathan.justus at oracle.com> wrote:
>
> There has never been more than one leap second added in any one
> instance, but as far as I know, nothing precludes adding more than one
> at any one time.

The specification TF.460 does not allow for more than one leap second at
the end of each month.

http://www.itu.int/dms_pubrec/itu-r/rec/tf/R-REC-TF.460-6-200202-I!!PDF-E.pdf

Tony.
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