Clock Changes in Pyongyang, North Korea

May 4, 2018 - Time Zone Change (PYT → KST)

When local standard time was about to reach
Friday, May 4, 2018, 11:30:00 pm clocks were turned forward 0:30 hours to
Saturday, May 5, 2018, 12:00:00 midnight local standard time instead.

More info:
North Korea Turns Its Clocks to Align with South