世界时转成北京时

GregorianCalendar gc=new GregorianCalendar();
try {
gc.setTime( new SimpleDateFormat("yyyyMMddHHmm").parse("201608101659"));
System.out.println( (new SimpleDateFormat("yyyyMMddHHmm")).format(gc.getTime()) );
gc.add(Calendar.HOUR_OF_DAY, 8);
} catch (ParseException e) {
e.printStackTrace();
}
System.out.println( (new SimpleDateFormat("yyyyMMddHHmm")).format(gc.getTime()) );