什么时候用when？
when表示询问时间范围，如“什么日期”，也可以指“几点钟、几点几分”。what time则表示询问具体的时间，指“某一天的几点钟、某一天的几时几分”，可用作名词、主语和介词宾语。一、when 和what time区别
1、when表示的时间范围比较广，比较笼统，有时也可以指“几点钟”,“几点几分”，用来代替what time.
2、what time所表示的时间比较精确，一般都是指某一天的“几点钟”，“几时几分”，也可以用作于名词、主语和介词宾语。
当然，when 和what time都可以表示“什么时候”。
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