What's interesting is that they chose the date for an anniversary.  If they roll the clocks back from 00:00 to 23:30, then they'll be giving 30 minutes more to the previous date - not their anniversary date.   Of course, we can't be sure until they announce an actual transition time, or until we get reports after-the-fact about when they actually did it.

> From: someone@mearie.org
> Date: Fri, 7 Aug 2015 11:11:31 +0900
> To: tz@iana.org
> Subject: [tz] North Korea (Asia/Pyongyang) to switch to UTC+8:30
>
> https://en-maktoob.news.yahoo.com/turning-back-clock-north-korea-creates-pyongyang-standard-013625261.html
>
> Note that the exact transition time is not specified (0:00 UTC+9:00?
> 0:00 UTC+8:30? I don't know). I couldn't find any specifics about
> that.
>
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> -- Kang Seonghoon | http://mearie.org/
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