今までで

[zuotengdazuo]

否ーーそういえば、昨日の校舎への攻撃命令も、今までではあまり考えられない強攻策だった。

Hi. I have looked up the expression 今までで online and learned that it means "for the first time ever". But I don't know why we should put a で after まで. What is the function of the で?
Thank you.

 

[Toritoribe]

That's 今まで + では.

 

[zuotengdazuo]

That's 今まで + では.

Thank you. So is this では used in the same way as in この仕事は一時間では終わらない。?

 

[Toritoribe]

Yes, it indicates premise of judgment, similar to だと.