上网查User Manual for Users of the Student and Exchange Visitor Information System (SEVIS)， page 128
The Employment Start Date field is pre-populated with the date following the . more info on 1point3acres.com
employment end date of the Approved post-completion OPT segment and cannot be
The Employment End Date field is pre-populated with the date that is 17 months
from the system-generated employment start date and cannot be altered.