Is it night you location? (Correctly?)
How I can ask somebody that the time of day in location where he/she live? (if I don't know the time different between us for example)

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The phrase you want is "Is it night where you are?"  The word "location" is far too technical and academic for a simple question like this.

Also, if the verb is "to be", then we use an adjective, not an adverb: "(Is this sentence) Correct?"

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"Is it night in your location?" would sound okay to me.

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You could say "What time is it at your place?" or "What's the time at your place?" or "Is it night-time/day-time at your place?" etc.

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You can simply ask : "What time is it in your country?"

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