The president tweeted: "We will both try to make it a very special moment for World Peace!"
Mr Trump is providing details for the first time about the history-making meeting between a sitting American president and the leader of North Korea over denuclearisation.
He had said he favoured holding the meeting at the Demilitarised Zone, the heavily fortified border separating the Koreas.
But the island nation was favoured by most of his advisers.
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US secretary of state Mike Pompeo has travelled to Pyongyang twice to meet with Mr Kim in recent months, in a precursor to the Trump-Kim meeting.
Mr Pompeo returned overnight with three captive Americans during his most recent trip.