Find the mistake in this sentence:
It was on 12th April, 1961 when the first human, a Soviet cosmonaut, flew into space.
There is not anything really wrong with your sentence, but to put the emphasis on the whole adverbial phrase "on 12th April, 1961" you should use "that" instead of "when". It was on 12th April, 1961 that the first human, a Soviet cosmonaut, flew into space.
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There is not anything really wrong with your sentence, but to put the emphasis on the whole adverbial phrase "on 12th April, 1961" you should use "that" instead of "when".
It was on 12th April, 1961 that the first human, a Soviet cosmonaut, flew into space.