Checking `timezone != null & !timezone.isEmpty()` will result in a `NullPointerException` when `timezone` is null, as the `&` ensures `timezone.isEmpty()` will run in all cases.
Checking `timezone != null & !timezone.isEmpty()` will result in a `NullPointerException` when `timezone` is null, as the `&` ensures `timezone.isEmpty()` will run in all cases.