每个月，USCIS会决定用Final Action Date，还是Filing Date： https://www.uscis.gov/visabulletininfo
For Employment-Based Preference Filings:
You must use the Final Action Dates chart in the Department of State Visa
Bulletin for February 2017.
三月份EB2的Final Action Date是12/15/2012。必须得这之前的才能交。
去年有几个月可以用Filing Date交。
