North Korea announced Friday that it was changing its standard time to GMT+8:30, 30 minutes behind South Korea.
Pyongyang offered a nationalist rationale for the move, saying it would return the North to an original time zone used before Japan imposed Tokyo standard time during its 1910-45 colonial rule of the Korean peninsula.
The new system is to take effect on August 15 this year -- the 70th anniversary of the peninsula's liberation from Japanese rule.
Noting that Pyongyang's move had triggered international criticism, Park said it also threatened a "further deepening of disparity between the two Koreas."
Inter-Korean ties have been icy for years following a series of nuclear and long-range missile tests by the North and occasional military clashes along the border.
Pyongyang in recent months rejected a series of dialogue offers, citing Seoul's refusal to halt annual military exercises with the United States.
"The North's action to break from the shared standard time ... Runs counter to efforts to foster inter-Korea cooperation and to achieve reunification," Park said.
Park has often described unification as a top priority, but critics say many of her policy goals lack concrete steps and point to the absence of any high-level official talks since February 2014.
Cross-border tensions are expected to escalate since Seoul today vowed to retaliate after blaming North Korea for planting landmines that maimed two soldiers on border patrol.
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