@AfterStartDate({"startOfDilation","endOfDilation"})
public class MyBean{
    private Date startDate,
    private Date stopDate,
    ...
}

@Target({ ElementType.METHOD, ElementType.CONSTRUCTOR,ElementType.ANNOTATION_TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = AfterStartDateValidator.class)
public @interface AfterStartDate {
    String message() default "{AfterStartDate.message}";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}

@SupportedValidationTarget(ValidationTarget.PARAMETERS)
public class AfterStartDateValidator implements ConstraintValidator<AfterStartDate,Object[]> {

    @Override
    public void initialize(AfterStartDate constraintAnnotation) {
    }

    @Override
    public boolean isValid(Object[] value, ConstraintValidatorContext context){
        if ( value.length != 2 ) {
            throw new IllegalArgumentException( "Illegal method signature" );
        }

        //leave null-checking to @NotNull on individual parameters
        if ( value[0] == null || value[1] == null ) {
            return true;
        }

        if ( !( value[0] instanceof Date ) || !( value[1] instanceof Date ) ) {
            throw new IllegalArgumentException(
                "Illegal method signature, expected two " +
                        "parameters of type Date."
            );
        }

        return ( (Date) value[0] ).before( (Date) value[1] );
       }
   }