What нельзя использовать в этом предложении, должно быть when. Разницы нет, но второе предложение звучит намного более естественнее.

WHAT TIME is perfectly correct in this and any sentence asking *when* something happened.

Also, when the question is about a when something happened one time in the past, you use the simple past and never the present perfect.
• When WERE you born?
• What time DID you arrive?
• When WAS he here?

what have you finished your work today ?

Откуда такое? Так не говорят ни по-русски, ни по-английски.

😂

Думаю, вопрос был have you finished или did you finish

вопрос был в том что можно использовать what time с perfect

That’s what I thought.

Road, you can’t use the perfect with WHAT TIME because you can’t use the perfect when you mention a specific time in the past, and WHAT TIME asks for a specific time.

thanks much to you

how about the difference between:
we haven't spoken since july
we haven't been speaking since July

You’re welcome. Great question!

We haven’t spoken since July: for some reason, we haven’t had an opportunity to speak since July (we live in different cities, we’re both busy, etc.);
We haven’t been speaking since July: We fell out in July and haven’t spoken since then.