He became a duke（公爵） on the death of his father.中的on是什么用法?

题目

He became a duke（公爵） on the death of his father.中的on是什么用法?
这里的on什么用法?能再举个例子么

答案

这句话省略了后面的日期 应当是on the date of his father's death
口语里面省了没什么关系 你可以把on理解为建立在……的基础上