ADDITIONAL SYSTEM INFORMATION :
OS: MacOs/Linux
Java: 1.8/11

A DESCRIPTION OF THE PROBLEM :
// for both java 8 and 11 I can see the following code snippet add 1 hour to the Timestamp
Timezone Pacific Standard Time (PST)

public class TestSQLTimstampParser {
    public static void main(String[] args) {
        //2019-03-10 02:46:18.792035
        java.sql.Timestamp ts = Timestamp.valueOf("2019-03-10 02:46:18.792035");
        java.sql.Timestamp ts1 = Timestamp.valueOf("2019-03-10 02:46:18");
        System.out.println(ts); // 2019-03-10 03:46:18.792035
        System.out.println(ts1);

        // 2019-08-13 04:51:43
        java.sql.Timestamp ts2 = Timestamp.valueOf("2019-08-13 04:51:43");
        System.out.println(ts2); // output 2019-08-13 04:51:43.0
    }
}


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
public class TestSQLTimstampParser {
    public static void main(String[] args) {
        //2019-03-10 02:46:18.792035
        java.sql.Timestamp ts = Timestamp.valueOf("2019-03-10 02:46:18.792035");
        java.sql.Timestamp ts1 = Timestamp.valueOf("2019-03-10 02:46:18");
        System.out.println(ts); // 2019-03-10 03:46:18.792035
        System.out.println(ts1);

        // 2019-08-13 04:51:43
        java.sql.Timestamp ts2 = Timestamp.valueOf("2019-08-13 04:51:43");
        System.out.println(ts2); // output 2019-08-13 04:51:43.0
    }
}

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
2019-03-10 02:46:18.792035
2019-03-10 02:46:18.0
2019-08-13 04:51:43.0
ACTUAL -
2019-03-10 03:46:18.792035
2019-03-10 03:46:18.0
2019-08-13 04:51:43.0

FREQUENCY : always