[tz] Question about leap seconds

Patrice Scattolin patrice.scattolin at oracle.com
Wed Sep 11 17:11:24 UTC 2013

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) 

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 

On 11/09/2013 11:58 AM, Ian Abbott wrote:
> 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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