[ntp:questions] Leap second to be introduced in June

Mike S mikes at flatsurface.com
Fri Jan 23 20:29:31 UTC 2015


On 1/23/2015 2:03 PM, schmidt.rich at gmail.com wrote:

> What shall you program
> about the end of June, 2016, or December, 2020?  What will be the
> interval of time between now and then?

Depends. What are you doing which requires 1 second accuracy a year or 5 
from now? Does it need to happen at a specific time, or a specific 
interval in the future?

Even with all the problems POSIX has with time, cron would still make it 
happened at a specific time, except possibly during a very short period 
when a leap second actually occurs. And if you need it at a specific 
interval in the future, the problem's still not particularly difficult. 
Many programs need to handle things which are indeterminate in the future.

Are you really unable to figure out how to do it, or are you trying to 
make a problem which doesn't really exist?

Note, that if you need 1 second accuracy a year or 5 out, then unless 
you have an atomic clock you will need some external time input to stay 
in sync. There's no reason that external time input can't also provide 
upcoming leap second info well in advance. Either an Internet connection 
or GPS connection will provide that easily.


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