java中date日期格式的各种转换

        Date dt =new Date();  
            System.out.println(dt); //格式: Wed Jul 06 09:28:19 CST 2016  
              
            //格式:2016-7-6  
            String formatDate = null;  
            formatDate = DateFormat.getDateInstance().format(dt);  
            System.out.println(formatDate);    
              
            //格式:2016年7月6日 星期三  
            formatDate = DateFormat.getDateInstance(DateFormat.FULL).format(dt);  
            System.out.println(formatDate);  
              
            //格式 24小时制:2016-07-06 09:39:58  
            DateFormat dFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); //HH表示24小时制;  
            formatDate = dFormat.format(dt);  
            System.out.println(formatDate);  
              
            //格式12小时制:2016-07-06 09:42:44  
            DateFormat dFormat12 = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); //hh表示12小时制;  
            formatDate = dFormat12.format(dt);  
            System.out.println(formatDate);  
              
            //格式去掉分隔符24小时制:20160706094533  
            DateFormat dFormat3 = new SimpleDateFormat("yyyyMMddHHmmss");  
            formatDate = dFormat3.format(dt);  
            System.out.println(formatDate);  
              
            //格式转成long型:1467770970  
            long lTime = dt.getTime() / 1000;  
            System.out.println(lTime);  
              
            //格式long型转成Date型,再转成String:  1464710394 -> ltime2*1000 -> 2016-05-31 23:59:54  
            long ltime2 = 1464710394;  
            SimpleDateFormat lsdFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
            Date lDate = new Date(ltime2*1000);  
            String lStrDate = lsdFormat.format(lDate);  
            System.out.println(lStrDate);  
              
            //格式String型转成Date型:2016-07-06 10:17:48 -> Wed Jul 06 10:17:48 CST 2016  
            String strDate = "2016-07-06 10:17:48";  
            SimpleDateFormat lsdStrFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
            try {  
                Date strD = lsdStrFormat.parse(strDate);  
                System.out.println(strD);  
            } catch (ParseException e) {  
                e.printStackTrace();  
            } 

指定格式互转

        // date 转 yyyy-MM-dd HH:mm:ss
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            String timeStr = sdf.format(new Date());
            System.out.println("当前时间为:"+timeStr);
            String fuck = timeStr.substring(5,timeStr.length());
            System.out.println(fuck);
            
        // yyyy年M月d日 转 yyyy-MM-dd
            SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy年M月d日");
            try {
                Date d = sdf2.parse("2013年01月06日");
                sdf = new SimpleDateFormat("yyyy-MM-dd");
                System.out.println(sdf.format(d));
                System.out.println(d.getDate());
            } catch (ParseException e) {
                e.printStackTrace();
            }

         // yyyy-MM-dd 转 MM-dd
            try {
            SimpleDateFormat sdf3 = new SimpleDateFormat("yyyy-MM-dd");
            Date  date = sdf3.parse("2017-09-01");
            sdf3=new SimpleDateFormat("MM-dd");
            String shit = sdf3.format(date);
            System.out.println(shit);
            } catch (ParseException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }