package demo.java.time;

import java.time.DayOfWeek;

import java.time.LocalDate;

import java.time.format.DateTimeFormatter;

import java.time.format.TextStyle;

import java.time.temporal.TemporalAdjusters;

import java.time.temporal.WeekFields;

import java.util.Locale;

public class LocalDateDemo {

public static void main(String[] args) {

LocalDate localDate = LocalDate.now();

System.out.println("localDate=" + localDate);

System.out.println("localDate=" + localDate.format(DateTimeFormatter.ofPattern("yyyy-MM-dd")));

System.out.println("localDate=" + localDate.getYear() + String.format("-%02d", localDate.getMonthValue()) + String.format("-%02d", localDate.getDayOfMonth()));

System.out.println("localDate.getDayOfWeek=" + localDate.getDayOfWeek());

System.out.println("localDate.getDayOfWeek=" + localDate.getDayOfWeek().getDisplayName(TextStyle.SHORT, Locale.US));

System.out.println("localDate.getDayOfWeek=" + localDate.getDayOfWeek().getDisplayName(TextStyle.SHORT, Locale.CHINA));

System.out.println("localDate.getDayOfYear=" + localDate.getDayOfYear());

System.out.println("localDate.lengthOfMonth=" + localDate.lengthOfMonth());

System.out.println("localDate.lengthOfYear=" + localDate.lengthOfYear());

System.out.println();

System.out.println("weekOfWeekBasedYear=" + localDate.get(WeekFields.ISO.weekOfWeekBasedYear()));

WeekFields localWeekFields = WeekFields.of(Locale.getDefault());

int localWeekOfYear = localDate.get(localWeekFields.weekOfYear());

System.out.println("localWeekOfYear=" + localWeekOfYear);

WeekFields usWeekFields = WeekFields.of(Locale.US);

int usWeekOfYear = localDate.get(usWeekFields.weekOfYear());

System.out.println("usWeekOfYear=" + usWeekOfYear);

System.out.println();

localDate = localDate.plusDays(1);

// localDate = localDate.plusWeeks(1);

// localDate = localDate.plusMonths(1);

// localDate = localDate.plusYears(1);

System.out.println("localDate + 1=" + localDate);

localDate = localDate.minusDays(1);

System.out.println("localDate - 1=" + localDate);

System.out.println();

LocalDate epochDay = LocalDate.of(1970, 1, 1);

System.out.println(epochDay.format(DateTimeFormatter.ofPattern("yyyy/MM/dd")));

System.out.println("epochDay.getDayOfWeek=" + epochDay.getDayOfWeek());

System.out.println();

LocalDate testDay = LocalDate.of(2024, 7, 29);

LocalDate previousMonday = testDay.with(TemporalAdjusters.previous(DayOfWeek.MONDAY));

LocalDate previousOrSameMonday = testDay.with(TemporalAdjusters.previousOrSame(DayOfWeek.MONDAY));

System.out.println("previousMonday=" + previousMonday + ", previousOrSameMonday=" + previousOrSameMonday);

LocalDate nextSunday = testDay.with(TemporalAdjusters.next(DayOfWeek.SUNDAY));

LocalDate nextOrSameSunday = testDay.with(TemporalAdjusters.nextOrSame(DayOfWeek.SUNDAY));

System.out.println("nextSunday=" + nextSunday + ", nextOrSameSunday=" + nextOrSameSunday);

System.out.println();

// 获取本周的第一天（周一）、最后一天（周日）

LocalDate mondayOfWeek = LocalDate.now().with(TemporalAdjusters.previousOrSame(DayOfWeek.MONDAY));

LocalDate sundayOfWeek = LocalDate.now().with(TemporalAdjusters.nextOrSame(DayOfWeek.SUNDAY));

System.out.println("mondayOfWeek=" + mondayOfWeek + ", sundayOfWeek=" + sundayOfWeek);

LocalDate mondayOfLastWeek = mondayOfWeek.minusDays(7);

LocalDate sundayOfLastWeek = sundayOfWeek.minusDays(7);

System.out.println("mondayOfLastWeek=" + mondayOfLastWeek + ", sundayOfLastWeek=" + sundayOfLastWeek);

LocalDate mondayOfNextWeek = LocalDate.now().plusDays(7).with(TemporalAdjusters.previousOrSame(DayOfWeek.MONDAY));

LocalDate sundayOfNextWeek = LocalDate.now().plusDays(7).with(TemporalAdjusters.nextOrSame(DayOfWeek.SUNDAY));

System.out.println("mondayOfNextWeek=" + mondayOfNextWeek + ", sundayOfNextWeek=" + sundayOfNextWeek);

System.out.println();

// 获取本月第一天、最后一天

LocalDate firstDayOfMonth = LocalDate.now().with(TemporalAdjusters.firstDayOfMonth());

LocalDate lastDayOfMonth = LocalDate.now().with(TemporalAdjusters.lastDayOfMonth());

System.out.println("firstDayOfMonth=" + firstDayOfMonth + ", lastDayOfMonth=" + lastDayOfMonth);

// 获取上个月第一天、最后一天

LocalDate firstDayOfLastMonth = LocalDate.now().minusMonths(1).with(TemporalAdjusters.firstDayOfMonth());

LocalDate lastDayOfLastMonth = LocalDate.now().minusMonths(1).with(TemporalAdjusters.lastDayOfMonth());

System.out.println("firstDayOfLastMonth=" + firstDayOfLastMonth + ", lastDayOfLastMonth=" + lastDayOfLastMonth);

// 获取下个月第一天、最后一天

LocalDate firstDayOfNextMonth = LocalDate.now().with(TemporalAdjusters.firstDayOfNextMonth());

LocalDate lastDayOfNextMonth = LocalDate.now().plusMonths(1).with(TemporalAdjusters.lastDayOfMonth());

System.out.println("firstDayOfNextMonth=" + firstDayOfNextMonth + ", lastDayOfNextMonth=" + lastDayOfNextMonth);

System.out.println();

// 获取今年第一天、最后一天

LocalDate firstDayOfYear = LocalDate.now().with(TemporalAdjusters.firstDayOfYear());

LocalDate lastDayOfYear = LocalDate.now().with(TemporalAdjusters.lastDayOfYear());

System.out.println("firstDayOfYear=" + firstDayOfYear + ", lastDayOfYear=" + lastDayOfYear);

// 获取去年第一天、最后一天

LocalDate firstDayOfLastYear = LocalDate.now().minusYears(1).with(TemporalAdjusters.firstDayOfYear());

LocalDate lastDayOfLastYear = LocalDate.now().minusYears(1).with(TemporalAdjusters.lastDayOfYear());

System.out.println("firstDayOfLastYear=" + firstDayOfLastYear + ", lastDayOfLastYear=" + lastDayOfLastYear);

// 获取明年第一天、最后一天

LocalDate firstDayOfNextYear = LocalDate.now().with(TemporalAdjusters.firstDayOfNextYear());

LocalDate lastDayOfNextYear = LocalDate.now().plusYears(1).with(TemporalAdjusters.lastDayOfYear());

System.out.println("firstDayOfNextYear=" + firstDayOfNextYear + ", lastDayOfNextYear=" + lastDayOfNextYear);

}

}