public static void main(String[] args) {
        //年
        int year = LocalDate.now().getYear();
        System.out.println(year);

        //月(英文)
        Month month = LocalDate.now().getMonth();
        System.out.println(month);

        //日
        int dayOfMonth = LocalDate.now().getDayOfMonth();
        System.out.println(dayOfMonth);

        //时
        int hour = LocalDateTime.now().getHour();
        System.out.println(hour);

        //分
        int minute = LocalDateTime.now().getMinute();
        System.out.println(minute);

        //秒
        int second = LocalDateTime.now().getSecond();
        System.out.println(second);

        //周几
        DayOfWeek dayOfWeek = LocalDate.now().getDayOfWeek();
        System.out.println(dayOfWeek);

        //距离今年第一年的第多少天
        int dayOfYear = LocalDate.now().getDayOfYear();
        System.out.println(dayOfYear);

        //开始时间(精确时分秒)
        LocalDateTime todayStart = LocalDateTime.of(LocalDate.now().minusDays(1), LocalTime.MIN);
        System.out.println(todayStart);

        //结束时间(精确时分秒)
        LocalDateTime todayEnd = LocalDateTime.of(LocalDate.now().minusDays(1), LocalTime.MAX);
        System.out.println(todayEnd);

        //LocalDate -> String(两种)
        String format = LocalDate.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
        System.out.println(format);
        String date = LocalDates.formatLocalDate(LocalDate.now(), YYYYMMDD_PATTERN);
        System.out.println(date);
        //LocalDateTime -> String
        String format1 = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
        System.out.println(format1);

        //String -> LocalDate
        LocalDate ldt1 = LocalDates.parseLocalDate("2017-09-28","yyyy-MM-dd");
        System.out.println(ldt1);
        //String -> LocalDateTime
        LocalDateTime ldt = LocalDateTime.parse("2017-09-28 17/07/05",DateTimeFormatter.ofPattern("yyyy-MM-dd HH/mm/ss"));
        System.out.println(ldt);
    }