180일 전에도 AC21적용이 가능한지요? 아래 글을 보면 아래 햐당되는 사항만 아니면 가능한걸로 나오네요.
Using AC21 if leaving your employer before the 180 days:
The fact that you have left your previous employer prior to your I-485 pending for 180 days is not the basis for denial of your portability case since adjustment of status is based on prospective employment, rather than an existing one.
However your I-485 case will be denied if any of the following happens:
Your I-140 is withdrawn by your employer before your I-485 reaches 180 days; or
Your I-140 is denied by the USCIS at any time; or
Your approved I-140 is revoked at any time, except when it is based on a withdrawal request from your employer (not fraud related, for example) submitted after your I-485 has been pending for 180 days; or
You fail to prove that a bona fide employment relationship existed at the time of filing.
So leaving too early obviously makes it more difficult to establish your case, especially if your employer is no longer willing to cooperate.