LocalDate date = LocalDate.of(2023, 5, 15);
int year = date.getYear();        // 2023
Month month = date.getMonth();    // MAY
int day = date.getDayOfMonth();   // 15
DayOfWeek dow = date.getDayOfWeek(); // MONDAY
int len = date.lengthOfMonth();   // 31 (5月的天数)
boolean leap = date.isLeapYear(); // false (2023不是闰年)

LocalDate tomorrow = today.plusDays(1);
LocalDate nextWeek = today.plusWeeks(1);
LocalDate nextMonth = today.plusMonths(1);
LocalDate nextYear = today.plusYears(1);
LocalDate yesterday = today.minusDays(1);

LocalDate date1 = LocalDate.of(2023, 5, 15);
LocalDate date2 = LocalDate.of(2023, 6, 20);

boolean isBefore = date1.isBefore(date2); // true
boolean isAfter = date1.isAfter(date2);   // false
boolean isEqual = date1.isEqual(date2);   // false

LocalDate date = LocalDate.of(2023, 5, 15);
LocalDate firstDayOfMonth = date.withDayOfMonth(1);
LocalDate lastDayOfYear = date.with(TemporalAdjusters.lastDayOfYear());

LocalDate date = LocalDate.now();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy/MM/dd");
String formattedDate = date.format(formatter);

String dateStr = "2023/05/15";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy/MM/dd");
LocalDate date = LocalDate.parse(dateStr, formatter);

LocalDate startDate = LocalDate.of(2023, 5, 1);
LocalDate endDate = LocalDate.of(2023, 5, 15);
long daysBetween = ChronoUnit.DAYS.between(startDate, endDate);
System.out.println("天数差: " + daysBetween);

LocalDate dateToCheck = LocalDate.of(2023, 5, 10);
LocalDate startDate = LocalDate.of(2023, 5, 1);
LocalDate endDate = LocalDate.of(2023, 5, 31);
if (dateToCheck.isAfter(startDate) && dateToCheck.isBefore(endDate)) {
    System.out.println("日期在范围内");
}

LocalDate date = LocalDate.of(2023, 5, 1);
int daysInMonth = date.lengthOfMonth();

for (int i = 1; i <= daysInMonth; i++) {
    System.out.println(date.withDayOfMonth(i));
}

import java.time.LocalDate;
import java.time.Month;
import java.time.DayOfWeek;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.util.Locale;

public class LocalDateDemo {

    public static void main(String[] args) {
        // 1. 创建 LocalDate 实例
        System.out.println("=== 创建 LocalDate 实例 ===");
        LocalDate today = LocalDate.now();
        LocalDate specificDate = LocalDate.of(2023, Month.JULY, 15);
        LocalDate parsedDate = LocalDate.parse("2023-08-20");
       
        System.out.println("当前日期: " + today);
        System.out.println("特定日期: " + specificDate);
        System.out.println("解析日期: " + parsedDate);

        // 2. 获取日期信息
        System.out.println("\n=== 获取日期信息 ===");
        System.out.println("年: " + today.getYear());
        System.out.println("月: " + today.getMonth() + " (" + today.getMonthValue() + ")");
        System.out.println("日: " + today.getDayOfMonth());
        System.out.println("星期: " + today.getDayOfWeek());
        System.out.println("一年中的第几天: " + today.getDayOfYear());
        System.out.println("月份天数: " + today.lengthOfMonth());
        System.out.println("年份天数: " + today.lengthOfYear());
        System.out.println("是否闰年: " + today.isLeapYear());

        // 3. 日期计算
        System.out.println("\n=== 日期计算 ===");
        System.out.println("加5天: " + today.plusDays(5));
        System.out.println("加2周: " + today.plusWeeks(2));
        System.out.println("加3个月: " + today.plusMonths(3));
        System.out.println("减1年: " + today.minusYears(1));
       
        System.out.println("下个月的第一天: " + today.plusMonths(1).withDayOfMonth(1));
        System.out.println("本月的最后一天: " + today.withDayOfMonth(today.lengthOfMonth()));

        // 4. 日期比较
        System.out.println("\n=== 日期比较 ===");
        LocalDate date1 = LocalDate.of(2023, 6, 15);
        LocalDate date2 = LocalDate.of(2023, 6, 20);
       
        System.out.println(date1 + " 在 " + date2 + " 之前? " + date1.isBefore(date2));
        System.out.println(date1 + " 在 " + date2 + " 之后? " + date1.isAfter(date2));
        System.out.println(date1 + " 等于 " + date2 + "? " + date1.isEqual(date2));
       
        // 5. 计算日期差
        System.out.println("\n=== 计算日期差 ===");
        LocalDate startDate = LocalDate.of(2023, 1, 1);
        LocalDate endDate = LocalDate.of(2023, 12, 31);
       
        System.out.println("两个日期之间的天数: " + ChronoUnit.DAYS.between(startDate, endDate));
        System.out.println("两个日期之间的月数: " + ChronoUnit.MONTHS.between(startDate, endDate));
        System.out.println("两个日期之间的年数: " + ChronoUnit.YEARS.between(startDate, endDate));

        // 6. 日期格式化
        System.out.println("\n=== 日期格式化 ===");
        DateTimeFormatter basicFormatter = DateTimeFormatter.ofPattern("yyyy/MM/dd");
        DateTimeFormatter chineseFormatter = DateTimeFormatter.ofPattern("yyyy年MM月dd日 EEEE", Locale.CHINA);
        DateTimeFormatter customFormatter = DateTimeFormatter.ofPattern("MMM dd, yyyy", Locale.US);
       
        System.out.println("基本格式: " + today.format(basicFormatter));
        System.out.println("中文格式: " + today.format(chineseFormatter));
        System.out.println("英文格式: " + today.format(customFormatter));

        // 7. 其他实用方法
        System.out.println("\n=== 其他实用方法 ===");
        System.out.println("调整到下个星期一: " + today.with(DayOfWeek.MONDAY));
        System.out.println("是否是周末: " +
            (today.getDayOfWeek() == DayOfWeek.SATURDAY || today.getDayOfWeek() == DayOfWeek.SUNDAY));
       
        // 8. 日期范围迭代
        System.out.println("\n=== 日期范围迭代 ===");
        System.out.println("接下来7天的日期:");
        today.datesUntil(today.plusDays(7))
             .forEach(System.out::println);
    }
}