When are we meeting, dear, I am hungry?
What time are we meeting, dear, I am hungry?
Please elaborate on the semantical differences.
The main difference is that the latter is really only answerable with some kind of wall-clock time answer, while the former can be more vague. This makes sense if you think about it. If the question is "What time...?" then the answer would have to include a time, right?
For example, if I ask a teammate,
However, if I were to ask,
However, both of those phrases read as two sentences to me. If I were writing them I'd put a question mark after the word
The first is grammatically sound. The interrogative adverb "when?" cooperates with the pronoun-verb phrase "we are meeting". You see this if you replace the "when?" with an adverb of time, such as "soon" (or a prepositional phrase, such as "at six"). Hence "we are meeting soon" makes sense as an answer (and so does "we are meeting at six"), replacing the interrogative adverb with a definite adverb (or prepositional phrase).
The second sentence is unsound - except when spoken informally - because "what time?" is an interrogative noun phrase, and cannot be replaced by an adverb. The noun phrase "what time" does not cooperate with the pronoun-verb phrase "we are meeting". You see this if you replace the "what time?" with any noun. The resulting answer makes no sense:
However, this way of putting it works when, instead of using "what time?", you use "at what time?" This turns the noun into a prepositional phrase, which, as we've seen, can be replaced with either a prepositional phrase or an adverb, because the two are grammatically equivalent.
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