[sed3]

There was never a negative leap second, so most systems are not ready for it. It is not just a question of time metadata.

And cooperation could be a problem. I can not imagine Microsoft providing updates for illegal Windows 7 in North Korea, and NK government just taking them.

[tokai]

I don't understand why we should care if NK's systems are on time or not.

[throw46365]

We should probably care that at least some of their systems share our definition of time.

International agreements have start times (and a couple of seconds could matter).

Physical things (any future international power supply for example) might depend on it too.

For better or worse, we have to be more charitable with NK than they are with us.