RELATIVE TIME EXPRESSIONS + で


> A) 休みは **明日で** 終わります。
>

>> The vacation will be over tomorrow.

> B) 彼がこの家を買ってから **今年で** 四年になります。
>

>> It's been four years this year since he bought this house.

Would the meaning change at all if we got rid of で?

One of my books says the following:

[![img1](https://i.stack.imgur.com/qZX6Pm.png)](https://i.stack.imgur.com/qZX6Pm.png)

There are no examples using relative expressions such as 明日 or 今年: that's why
the book as talks about に. I suppose it's the same idea, right?

