YOU SAID:

i've been working the whole month of August

INTO JAPANESE

私は8月中ずっと働いてきました

BACK INTO ENGLISH

I have worked all the way through August

INTO JAPANESE

私は8月までずっと働いてきました

BACK INTO ENGLISH

I have been working until August

INTO JAPANESE

私は8月まで働いています

BACK INTO ENGLISH

I work until August

INTO JAPANESE

私は8月まで働きます

BACK INTO ENGLISH

I will work until August

INTO JAPANESE

8月まで働きます

BACK INTO ENGLISH

Will work until August

INTO JAPANESE

8月まで動作します

BACK INTO ENGLISH

Will work until August