access database 编码求助

divide the hire data column into two columns: one called "old timers" for people hired before the year 2000, and one called "new hires" for people hired after that year.
中文  分拆雇佣日期，   2000以前为 old timers,  2000以后为 new hires.
 
各位大神  请问我写的编码那有问题