java日期格式转换

        Date date = new Date();

        String year = String.format("%tY", date);

        String month = String.format("%tB", date);

        String day = String.format("%te", date);

        System.out.println("今天是："+year+"-"+month+"-"+day);

        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        System.out.println("date是"+sdf.format(date));
        System.out.println("今天是"+sdf.format(date));
        System.out.println("昨天是"+sdf.format(new Date(date.getTime()-60*60*1000*24L)));
        System.out.println("30前天是"+sdf.format(new Date(date.getTime()-60*60*1000*24*30L)));