1     public static void getDateTime() throws ParseException{ 2             Calendar now = Calendar.getInstance(); 3             System.out.println("年: " + now.get(Calendar.YEAR)); 4             System.out.println("月: " + (now.get(Calendar.MONTH) + 1) + ""); 5             System.out.println("日: " + now.get(Calendar.DAY_OF_MONTH)); 6             System.out.println("时: " + now.get(Calendar.HOUR_OF_DAY)); 7             System.out.println("分: " + now.get(Calendar.MINUTE)); 8             System.out.println("秒: " + now.get(Calendar.SECOND)); 9             System.out.println("当前时间毫秒数：" + now.getTimeInMillis());10             System.out.println(now.getTime());11 12             Date d = new Date();13             System.out.println(d);14             SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");15             String dateNowStr = sdf.format(d);16             System.out.println("格式化后的日期：" + dateNowStr);17             18             String str = "2012-1-13 17:26:33";    //要跟上面sdf定义的格式一样19             Date today = sdf.parse(str);20             System.out.println("字符串转成日期：" + today);21    }