Would be great if you could test that. Not sure if the JDBC driver does a conversion of java.sql.Date from System/JVM timezone to the JDBC timezone. If it does, then we would need to add the offset difference to the java.sql.Date milliseconds to correct that.
According to this bug(https://bugs.mysql.com/bug.php?id=71084) it shouldn't do the conversion, thus it shouldn't be requried to change the unwrap method.