[tz] Question about leap seconds

[Ian Abbott]

On 2013-09-11 16:51, Clive D.W. Feather wrote:
> random832 at fastmail.us said:
>> Two things: Can a transition time ever reasonably fall _on_ a leap
>> second, and can the zic input format represent this case?
>
> It's very unlikely, but theoretically possible.

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.

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