getTimeInMillis() Calendar TimeZone

Calendar cChina = new GregorianCalendar(TimeZone.getTimeZone("China"));
Calendar cJapan = new GregorianCalendar(TimeZone.getTimeZone("Japan"));
System.out.println(cChina.getTimeInMillis());
System.out.println(cJapan.getTimeInMillis());
***返回毫秒数经过几十次运行，只有大概5次返回结果不一样，剩下一样。***
***既然时区不同，为什么毫秒数一样？（换其他时区效果一样）
System.out.println(cChina.get(Calendar.HOUR_OF_DAY));
System.out.println(cJapan.get(Calendar.HOUR_OF_DAY));
***这样每次就不同了，经过几次测试差一小时***
Calendar cJapan = new GregorianCalendar(TimeZone.getTimeZone("Japan"));
Timestamp tJapan = new Timestamp(cJapan.getTimeInMillis());
String sql = "insert into message values (null, ?)";
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setTimestamp(1, tJapan);
pstmt.executeUpdate();
***插进数据库的依然是我本地时间***
谢谢hyj_zhl
不过Timestamp的构造方法只有Timestamp(long l)只能是毫秒数，cJapan.get(Calendar.HOUR_OF_DAY)这个返回的是个int的小时数

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