Date date = new Date();//yyyy-mm-dd hh:mm:ss[.fffffffff]		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd hh:mm:ss.0");		System.out.println("现在的日期时间是：" + sdf.format(date));;		Calendar c = Calendar.getInstance();	//	c.setTime(date);		int second = c.get(Calendar.SECOND);		System.out.println("现在的小时是"+second);				int second2 = c.get(c.SECOND);		System.out.println(second2);		//拿到当前系统时间		System.out.println(System.currentTimeMillis());				//时区		Calendar japan = new GregorianCalendar(TimeZone.getTimeZone("Japan"));		System.out.println(japan.get(Calendar.HOUR_OF_DAY));		//打印时区ID		for (String timezone : TimeZone.getAvailableIDs()) {			System.out.println("时区的id  " + timezone);		}