Both are common.
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When it's an open question, then what is correct:
I hear you're going to London. What date are you planning to leave?
When it's a choice of a limited number of dates, then which is correct:
I hear you're visiting foreign capitals on May 1, July 4, and July 14. Which date are you planning to leave for London?
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I can talk about Super Bowl XLII champion new York Giants