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<div class="moz-cite-prefix">In practice the leap seconds tend to be
inserted at times of the year that aren't typical DST change
season (end of june or end of december)
<a class="moz-txt-link-freetext" href="http://en.wikipedia.org/wiki/Leap_second#Insertion_of_leap_seconds">http://en.wikipedia.org/wiki/Leap_second#Insertion_of_leap_seconds</a>
<br>
<br>
So odds are that in practice it's not a problem. It could be if a
jurisdiction decide to change it's timezone at the beginning of
the year though.<br>
<br>
On 11/09/2013 11:58 AM, Ian Abbott wrote:<br>
</div>
<blockquote cite="mid:52309328.10305@mev.co.uk" type="cite">On
2013-09-11 16:51, Clive D.W. Feather wrote:
<br>
<blockquote type="cite"><a class="moz-txt-link-abbreviated" href="mailto:random832@fastmail.us">random832@fastmail.us</a> said:
<br>
<blockquote type="cite">Two things: Can a transition time ever
reasonably fall _on_ a leap
<br>
second, and can the zic input format represent this case?
<br>
</blockquote>
<br>
It's very unlikely, but theoretically possible.
<br>
</blockquote>
<br>
A leap second would be inserted at 23:59:60 UTC, so I'm not sure
it's possible to have a DST transition at the start of a leap
second, but you could get a DST transition at the end of a leap
second.
<br>
<br>
</blockquote>
<br>
<br>
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