It can mean that, but it does not necessarily mean that.
When Paul says in Acts 23:1:
"Men and brethren, I have lived in all good conscience before God until this day."
Does Paul mean that after this day (i.e. the day after he was arrested for preaching Christ in Jerusalem) he will no longer live in good conscience with God?
Is he implying that because he has now appeared before Ananias he has changed and will no longer be in good conscience with God?
Clearly "until" does not have the restricted, exclusive meaning you place on it.
It has the very meaning.... yes, there was a change when the word UNITL was used....what? you answer that