Java 时间相关 获取某月的某一天

//获得当前时间的下个月十号

Calendar calendar = Calendar.getInstance();

        calendar.set(Calendar.DAY_OF_MONTH, 10);

        calendar.add(Calendar.MONTH, 1);

        //获得当前时间的本月十号

        Calendar calendar1 = Calendar.getInstance();

        calendar1.set(Calendar.DAY_OF_MONTH, 10);

        calendar1.add(Calendar.MONTH, 0);

        // 时间格式化

        SimpleDateFormat sdf =new SimpleDateFormat("yyyy/MM/dd");

        Date date =calendar.getTime();

        long millis =calendar.getTimeInMillis();// 毫秒值

        Date date1 =calendar1.getTime();

        long millis1 =calendar1.getTimeInMillis();// 毫秒值

        System.out.println(sdf.format(date));

//当前时间的毫秒值new Date().getTime()