North Korea has offered to close down its nuclear test site in May and reveal the process to the outside world.

Chief presidential press secretary Yoon Young-chan said on Sunday in a televised statement that North Korean leader Kim Jong-un said during the inter-Korean summit on Friday that he would carry out the closing of the nuclear test site in Punggye-ri next month.

Kim reportedly said that he will soon invite experts and journalists from the United States and South Korea to reveal the process to the outside world.

Yoon quoted the North Korean leader as saying that "some say that he is terminating facilities that are not functioning, but they are in good condition."

Yoon said that North Korea also plans to re-adjust its current time zone to match the South's. The North in 2015 created its own "Pyongyang Time" by setting the clock 30 minutes behind the South.

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