[Вован]

Используй метод OnCalcField компонента ADOTable1.
Там пишешь
Form1.ADOTable1.Field[3].Value:= MonthOf(Form1.ADOTable1.Field[2].AsDateTime);
Form1.ADOTable1.Field[4].Value:= YearOf(Form1.ADOTable1.Field[2].AsDateTime);