LoginLogic.java

public class LoginLogic {

   @Autowired
   private OriginalTimeManager timeManager; // This is an in-house class for managing data related to dates
  
   /**
    * @param graduateYear
    * @return whether current date is after or equal to graduate year's 1st April
    * @throws NullPointerException if the param graduateYear is null
    */
   boolean isAfterServiceGraduateDate(@NonNull Integer graduateYear) {
      LocalDate serviceGraduateDate = LocalDate.of(graduateYear, 4, 1); // In Japan, students commonly graduates at the end of March
      LocalDate currentLocalDate = timeManager.getCurrentLocalDate();
      return currentLocalDate.isAfter(serviceGraduateDate) || currentLocalDate.isEqual(serviceGraduateDate);
   }
}