How to adjust the entry schedule of Foxconn newcomers?

Under normal circumstances, the arranged day shift and night shift cannot be adjusted (except in special circumstances), because people have fixed the working hours of the recruiter when recruiting. Under normal circumstances, there is one shift every month, that is, the day shift last month and the night shift last month. It's basically the first half of every month. There are also some positions where the day shift is long and there is no need to change shifts.