Confusion about time scope of 日をもって


I have a sentence in the form 10月10日をもって辞めたい, for example。 Does this をもって mean
"before", or "after". Am I free on 10日 (i.e. work till 9日23:59). Or I still
have to work on 10日, and get free on 11日?

Kind of classic time uncertainty in Japanese, but this use of をもって is new to
me. I hope it has some certain meaning.




The previous state continues until the time specified by 〜を以って / 〜を以て (written
in 漢字 so people are aware this is not 持つ). So:

> 10月10日をもって辞めさせていただきます。

would mean:

> I will work through October 10th, after which I quit.  
>  I will be quiting as of October 11th.

In English, the similar expression "as of" takes a look at when the resultant
state **starts**. In Japanese, 〜をもって takes a look at when the previous state
**ends**. This is why I think 〜をもって can be so tough to get the hang of for
native English speakers.




The previous state continues until the time specified by 〜を以って / 〜を以て (written
in 漢字 so people are aware this is not 持つ). So:

> 10月10日をもって辞めさせていただきます。

would mean:

> I will work through October 10th, after which I quit.  
>  I will be quiting as of October 11th.

In English, the similar expression "as of" takes a look at when the resultant
state **starts**. In Japanese, 〜をもって takes a look at when the previous state
**ends**. This is why I think 〜をもって can be so tough to get the hang of for
native English speakers.

