when is it是不是等于what time is it?what time is it换种方法提问意思不变

when一般用来提问大概的时间；而what time用来提问具体时间.
例如：I went to Beijing last summer.（可用When did you go to Beijing?来提问.）
I get up at seven o'clock.（可用What time do you get up?来提问.）
再问： when is it是不是等于what time is it?
再答： 可以替换的。