～は何時ですか

This phrase combines several elements. '～' acts as a placeholder for the event or thing you're asking about. 'は' (wa) is a topic particle, marking the preceding element as the topic of the sentence. '何時' (nanji) literally means 'what hour' or 'what time'. 'です' (desu) is a polite copula, similar to 'is' or 'am' in English. 'か' (ka) is a question particle, turning the statement into a question. The structure is a fundamental way to ask 'what is X' in Japanese, adapted here for time.