Pokhran-II was the series of five nuclear bomb test explosions conducted by India at the Indian Army's Pokhran Test Range in May 1998. It was the second Indian nuclear test; the first test, code-named Smiling Buddha, was conducted in May 1974.

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The relevant information is: Pokhran-II was the series of five nuclear bomb test explosions conducted by India at the Indian Army's Pokhran Test Range in May 1998. The answer is May 1998.