Java里得到00:00:00格式的时分秒的Timestamp

import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.TimeZone;
public class Test {
public static void main(String[] args) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
long t = System.currentTimeMillis();
t = t / (1000 * 3600 * 24) * (1000 * 3600 * 24);
System.out.println(sdf.format(new Timestamp(t)));
t = System.currentTimeMillis();
t = t / (1000 * 3600 * 24) * (1000 * 3600 * 24) - TimeZone.getDefault().getRawOffset();
System.out.println(sdf.format(new Timestamp(t)));
}
}