They are setting their clocks 30 minutes behind to differentiate themselves to themselves from the standard put in place by Japan more than a century ago.
The country's official Korea Central News Agency said Friday:
"The wicked Japanese imperialists committed such unpardonable crimes as depriving Korea of even its standard time while mercilessly trampling down its land with 5,000-year-long history and culture and pursuing the unheard-of policy of obliterating the Korean nation,"
Japan ruled over the then-unified Korea from 1910 to 1945 and set the local time for 9 hours ahead of GMT for the entire peninsula. The two Koreas were divided into North and South after the end of World War II.
http://www.usatoday.com/story/news/world/2015/08/07/north-korea-time-zone/31275995/
The new time zone was named: "Pyongyang time".
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