Personal leave must be used by June 30th. If you do not use the leave by June 30th, you will lose the time. EmpCenter shows this in the leave balances tab.
If you have leave available in your Personal Leave Bank at the beginning of June, EmpCenter shows that if you do not use the leave by the end of the month, you will lose the leave:
If you click on the Show Details link you will see that EmpCenter is set to "Clear" the bank on June 30th:
You are still able to use the time during the month of June - up to and including on the 30th:
Any balance remaining at the end of the day on the 30th will clear from your leave bank.