SQL | Display all rows where date is not current month

I have two tables
In one table there are my employees and when they changed the Department
In the second table there is my current date

Employee Table

+------------------+--------+-------------+-----------------+
| Personal Number  | Salary | Department  | MonthWhenJoined |
+------------------+--------+-------------+-----------------+
|              224 |   1000 | HR          |              03 |
|              224 |   1500 | R&D         |              07 |
|              578 |   1200 | Sales       |              04 |
|              578 |   2000 | Engineering |              09 |
|              694 |   1400 | R&D         |              04 |
|              694 |   1500 | Sales       |              08 |
+------------------+--------+-------------+-----------------+

Table with current Date

+------------+-----+-------+------+
|    Date    | Day | Month | Year |
+------------+-----+-------+------+
| 01.09.2019 |  01 |    09 | 2019 |
+------------+-----+-------+------+

Now I want to only see all Employee that have no ‘MonthWhenJoined’ equal to the current Month.
So the Result would be something like this

+------------------+--------+-------------+-----------------+
| Personal Number  | Salary | Departement | MonthWhenJoined |
+------------------+--------+-------------+-----------------+
|              224 |   1000 | HR          |              03 |
|              224 |   1500 | R&D         |              07 |
|              694 |   1400 | R&D         |              04 |
|              694 |   1500 | Sales       |              08 |
+------------------+--------+-------------+-----------------+

I know it can not be that hard, but I cant figure it out …
Thank you for your help!

Answer

SELECT *
FROM Employee
WHERE PersonalNumber NOT IN (
        SELECT PersonaNumber
        FROM Employee
        WHERE MonthWhenJoined =
        SELECT Month
        FROM currentDate
        )