某年某月的英语怎么说

某年某月的英语是："a certain year and month"。

这个表达方法来自于英语中使用"a certain"这个短语来表示"某个"或"某些"的用法。例如：

I have a certain book that I want to show you. 我有一本书想要给你看。
He has a certain charm that makes him popular with women. 他有一种魅力，让他深受女性欢迎。

因此，将"a certain"用于"year and month"，可以表示"某年某月"。例如：

I was born in a certain year and month. 我出生在某年某月。
She graduated from college in a certain year and month. 她在某年某月从大学毕业。