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Which is correct?

Which date is the appointment on or what date is the appointment on?

Both are in use?
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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

Which date we will celebrace mother's DaY?

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What date

which date

We celebrate mother's day on 12 may

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Neither

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