What is the time _ your watch?
Which preposition is correct?
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The only two I've heard are
Either one is fine and they both mean the same thing:
This seems to me a question to be asked when you think that your watch might be running fast or slow. If you just want to know what time it is, you can ask
Avoid asking "Excuse me, but do you have the time?" and no one will snap back with "For what?"