1. 简介

Java8提供了全新的日期处理包（java.time.*），根据Java8日期新特性封装日期时间工具类LocalDateTimeUtils。

2. 工具类方法目录

4. 示例代码#

Copyimport java.time.*;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalAdjusters;
import java.util.Date;

/**
 * LocalDateTime工具类
 *
 * @author CL
 */
public class LocalDateTimeUtils {

    /**
     * 当前时间
     *
     * @return
     */
    public static LocalDateTime now() {
        return LocalDateTime.now();
    }

    /**
     * Date 转 LocalDateTime
     *
     * @return
     */
    public static LocalDateTime convert(Date date) {
        return LocalDateTime.ofInstant(Instant.ofEpochMilli(date.getTime()), ZoneId.systemDefault());
    }

    /**
     * LocalDateTime 转 Date
     *
     * @return
     */
    public static Date convert(LocalDateTime localDateTime) {
        return Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
    }

    /**
     * 今天开始时间
     *
     * @return
     */
    public static LocalDateTime todayStartTime() {
        return LocalDateTime.of(LocalDate.now(), LocalTime.MIN);
    }

    /**
     * 今天结束时间
     *
     * @return
     */
    public static LocalDateTime todayEndTime() {
        return LocalDateTime.of(LocalDate.now(), LocalTime.MAX);
    }

    /**
     * 昨天开始时间
     *
     * @return
     */
    public static LocalDateTime yesterdayStartTime() {
        return LocalDateTime.of(LocalDate.now().minus(1L, ChronoUnit.DAYS), LocalTime.MIN);
    }

    /**
     * 昨天结束时间
     *
     * @return
     */
    public static LocalDateTime yesterdayEndTime() {
        return LocalDateTime.of(LocalDate.now().minus(1L, ChronoUnit.DAYS), LocalTime.MAX);
    }

    /**
     * 最近7天开始时间
     *
     * @return
     */
    public static LocalDateTime last7DaysStartTime() {
        return LocalDateTime.of(LocalDate.now().minus(6L, ChronoUnit.DAYS), LocalTime.MIN);
    }

    /**
     * 最近7天结束时间
     *
     * @return
     */
    public static LocalDateTime last7DaysEndTime() {
        return LocalDateTime.of(LocalDate.now(), LocalTime.MAX);
    }

    /**
     * 最近30天开始时间
     *
     * @return
     */
    public static LocalDateTime last30DaysStartTime() {
        return LocalDateTime.of(LocalDate.now().minus(29L, ChronoUnit.DAYS), LocalTime.MIN);
    }

    /**
     * 最近30天结束时间
     *
     * @return
     */
    public static LocalDateTime last30DaysEndTime() {
        return LocalDateTime.of(LocalDate.now(), LocalTime.MAX);
    }

    /**
     * 最近一年开始时间
     *
     * @return
     */
    public static LocalDateTime last1YearStartTime() {
        return LocalDateTime.of(LocalDate.now().minus(1L, ChronoUnit.YEARS).plus(1L, ChronoUnit.DAYS), LocalTime.MIN);
    }

    /**
     * 最近一年结束时间
     *
     * @return
     */
    public static LocalDateTime last1YearEndTime() {
        return LocalDateTime.of(LocalDate.now(), LocalTime.MAX);
    }

    /**
     * 本周开始时间
     *
     * @return
     */
    public static LocalDateTime weekStartTime() {
        LocalDate now = LocalDate.now();
        return LocalDateTime.of(now.minusDays(now.getDayOfWeek().getValue() - 1), LocalTime.MIN);
    }

    /**
     * 本周结束时间
     *
     * @return
     */
    public static LocalDateTime weekEndTime() {
        LocalDate now = LocalDate.now();
        return LocalDateTime.of(now.plusDays(7 - now.getDayOfWeek().getValue()), LocalTime.MAX);
    }

    /**
     * 本月开始时间
     *
     * @return
     */
    public static LocalDateTime monthStartTime() {
        return LocalDateTime.of(LocalDate.now().with(TemporalAdjusters.firstDayOfMonth()), LocalTime.MIN);
    }

    /**
     * 本月结束时间
     *
     * @return
     */
    public static LocalDateTime monthEndTime() {
        return LocalDateTime.of(LocalDate.now().with(TemporalAdjusters.lastDayOfMonth()), LocalTime.MAX);
    }

    /**
     * 本季度开始时间
     *
     * @return
     */
    public static LocalDateTime quarterStartTime() {
        LocalDate now = LocalDate.now();
        Month month = Month.of(now.getMonth().firstMonthOfQuarter().getValue());
        return LocalDateTime.of(LocalDate.of(now.getYear(), month, 1), LocalTime.MIN);
    }

    /**
     * 本季度结束时间
     *
     * @return
     */
    public static LocalDateTime quarterEndTime() {
        LocalDate now = LocalDate.now();
        Month month = Month.of(now.getMonth().firstMonthOfQuarter().getValue()).plus(2L);
        return LocalDateTime.of(LocalDate.of(now.getYear(), month, month.length(now.isLeapYear())), LocalTime.MAX);
    }

    /**
     * 本半年开始时间
     *
     * @return
     */
    public static LocalDateTime halfYearStartTime() {
        LocalDate now = LocalDate.now();
        Month month = (now.getMonthValue() > 6) ? Month.JULY : Month.JANUARY;
        return LocalDateTime.of(LocalDate.of(now.getYear(), month, 1), LocalTime.MIN);
    }

    /**
     * 本半年结束时间
     *
     * @return
     */
    public static LocalDateTime halfYearEndTime() {
        LocalDate now = LocalDate.now();
        Month month = (now.getMonthValue() > 6) ? Month.DECEMBER : Month.JUNE;
        return LocalDateTime.of(LocalDate.of(now.getYear(), month, month.length(now.isLeapYear())), LocalTime.MAX);
    }

    /**
     * 本年开始时间
     *
     * @return
     */
    public static LocalDateTime yearStartTime() {
        return LocalDateTime.of(LocalDate.now().with(TemporalAdjusters.firstDayOfYear()), LocalTime.MIN);
    }

    /**
     * 本年结束时间
     *
     * @return
     */
    public static LocalDateTime yearEndTime() {
        return LocalDateTime.of(LocalDate.now().with(TemporalAdjusters.lastDayOfYear()), LocalTime.MAX);
    }

    /**
     * 上周开始时间
     *
     * @return
     */
    public static LocalDateTime lastWeekStartTime() {
        LocalDate lastWeek = LocalDate.now().minus(1L, ChronoUnit.WEEKS);
        return LocalDateTime.of(lastWeek.minusDays(lastWeek.getDayOfWeek().getValue() - 1), LocalTime.MIN);
    }

    /**
     * 上周结束时间
     *
     * @return
     */
    public static LocalDateTime lastWeekEndTime() {
        LocalDate lastWeek = LocalDate.now().minus(1L, ChronoUnit.WEEKS);
        return LocalDateTime.of(lastWeek.plusDays(7 - lastWeek.getDayOfWeek().getValue()), LocalTime.MAX);
    }

    /**
     * 上月开始时间
     *
     * @return
     */
    public static LocalDateTime lastMonthStartTime() {
        return LocalDateTime.of(LocalDate.now().minus(1L, ChronoUnit.MONTHS).with(TemporalAdjusters.firstDayOfMonth()), LocalTime.MIN);
    }

    /**
     * 上月结束时间
     *
     * @return
     */
    public static LocalDateTime lastMonthEndTime() {
        return LocalDateTime.of(LocalDate.now().minus(1L, ChronoUnit.MONTHS).with(TemporalAdjusters.lastDayOfMonth()), LocalTime.MAX);
    }

    /**
     * 上季度开始时间
     *
     * @return
     */
    public static LocalDateTime lastQuarterStartTime() {
        LocalDate now = LocalDate.now();
        Month firstMonthOfQuarter = Month.of(now.getMonth().firstMonthOfQuarter().getValue());
        Month firstMonthOfLastQuarter = firstMonthOfQuarter.minus(3L);
        int yearOfLastQuarter = firstMonthOfQuarter.getValue() < 4 ? now.getYear() - 1 : now.getYear();
        return LocalDateTime.of(LocalDate.of(yearOfLastQuarter, firstMonthOfLastQuarter, 1), LocalTime.MIN);
    }

    /**
     * 上季度结束时间
     *
     * @return
     */
    public static LocalDateTime lastQuarterEndTime() {
        LocalDate now = LocalDate.now();
        Month firstMonthOfQuarter = Month.of(now.getMonth().firstMonthOfQuarter().getValue());
        Month firstMonthOfLastQuarter = firstMonthOfQuarter.minus(1L);
        int yearOfLastQuarter = firstMonthOfQuarter.getValue() < 4 ? now.getYear() - 1 : now.getYear();
        return LocalDateTime.of(LocalDate.of(yearOfLastQuarter, firstMonthOfLastQuarter, firstMonthOfLastQuarter.maxLength()), LocalTime.MAX);
    }

    /**
     * 上半年开始时间
     *
     * @return
     */
    public static LocalDateTime lastHalfYearStartTime() {
        LocalDate now = LocalDate.now();
        int lastHalfYear = (now.getMonthValue() > 6) ? now.getYear() : now.getYear() - 1;
        Month firstMonthOfLastHalfYear = (now.getMonthValue() > 6) ? Month.JANUARY : Month.JULY;
        return LocalDateTime.of(LocalDate.of(lastHalfYear, firstMonthOfLastHalfYear, 1), LocalTime.MIN);
    }

    /**
     * 上半年结束时间
     *
     * @return
     */
    public static LocalDateTime lastHalfYearEndTime() {
        LocalDate now = LocalDate.now();
        int lastHalfYear = (now.getMonthValue() > 6) ? now.getYear() : now.getYear() - 1;
        Month lastMonthOfLastHalfYear = (now.getMonthValue() > 6) ? Month.JUNE : Month.DECEMBER;
        return LocalDateTime.of(LocalDate.of(lastHalfYear, lastMonthOfLastHalfYear, lastMonthOfLastHalfYear.maxLength()), LocalTime.MAX);
    }

    /**
     * 上一年开始时间
     *
     * @return
     */
    public static LocalDateTime lastYearStartTime() {
        return LocalDateTime.of(LocalDate.now().minus(1L, ChronoUnit.YEARS).with(TemporalAdjusters.firstDayOfYear()), LocalTime.MIN);
    }

    /**
     * 上一年结束时间
     *
     * @return
     */
    public static LocalDateTime lastYearEndTime() {
        return LocalDateTime.of(LocalDate.now().minus(1L, ChronoUnit.YEARS).with(TemporalAdjusters.lastDayOfYear()), LocalTime.MAX);
    }

    /**
     * 下周开始时间
     *
     * @return
     */
    public static LocalDateTime nextWeekStartTime() {
        LocalDate nextWeek = LocalDate.now().plus(1L, ChronoUnit.WEEKS);
        return LocalDateTime.of(nextWeek.minusDays(nextWeek.getDayOfWeek().getValue() - 1), LocalTime.MIN);
    }

    /**
     * 下周结束时间
     *
     * @return
     */
    public static LocalDateTime nextWeekEndTime() {
        LocalDate nextWeek = LocalDate.now().plus(1L, ChronoUnit.WEEKS);
        return LocalDateTime.of(nextWeek.plusDays(7 - nextWeek.getDayOfWeek().getValue()), LocalTime.MAX);
    }

    /**
     * 下月开始时间
     *
     * @return
     */
    public static LocalDateTime nextMonthStartTime() {
        return LocalDateTime.of(LocalDate.now().plus(1L, ChronoUnit.MONTHS).with(TemporalAdjusters.firstDayOfMonth()), LocalTime.MIN);
    }

    /**
     * 下月结束时间
     *
     * @return
     */
    public static LocalDateTime nextMonthEndTime() {
        return LocalDateTime.of(LocalDate.now().plus(1L, ChronoUnit.MONTHS).with(TemporalAdjusters.lastDayOfMonth()), LocalTime.MAX);
    }

    /**
     * 下季度开始时间
     *
     * @return
     */
    public static LocalDateTime nextQuarterStartTime() {
        LocalDate now = LocalDate.now();
        Month firstMonthOfQuarter = Month.of(now.getMonth().firstMonthOfQuarter().getValue());
        Month firstMonthOfNextQuarter = firstMonthOfQuarter.plus(3L);
        int yearOfNextQuarter = firstMonthOfQuarter.getValue() > 9 ? now.getYear() + 1 : now.getYear();
        return LocalDateTime.of(LocalDate.of(yearOfNextQuarter, firstMonthOfNextQuarter, 1), LocalTime.MIN);
    }

    /**
     * 下季度结束时间
     *
     * @return
     */
    public static LocalDateTime nextQuarterEndTime() {
        LocalDate now = LocalDate.now();
        Month firstMonthOfQuarter = Month.of(now.getMonth().firstMonthOfQuarter().getValue());
        Month firstMonthOfNextQuarter = firstMonthOfQuarter.plus(5L);
        int yearOfNextQuarter = firstMonthOfQuarter.getValue() > 9 ? now.getYear() + 1 : now.getYear();
        return LocalDateTime.of(LocalDate.of(yearOfNextQuarter, firstMonthOfNextQuarter, firstMonthOfNextQuarter.maxLength()), LocalTime.MAX);
    }

    /**
     * 上半年开始时间
     *
     * @return
     */
    public static LocalDateTime nextHalfYearStartTime() {
        LocalDate now = LocalDate.now();
        int nextHalfYear = (now.getMonthValue() > 6) ? now.getYear() + 1 : now.getYear();
        Month firstMonthOfNextHalfYear = (now.getMonthValue() > 6) ? Month.JANUARY : Month.JULY;
        return LocalDateTime.of(LocalDate.of(nextHalfYear, firstMonthOfNextHalfYear, 1), LocalTime.MIN);
    }

    /**
     * 上半年结束时间
     *
     * @return
     */
    public static LocalDateTime nextHalfYearEndTime() {
        LocalDate now = LocalDate.now();
        int lastHalfYear = (now.getMonthValue() > 6) ? now.getYear() + 1 : now.getYear();
        Month lastMonthOfNextHalfYear = (now.getMonthValue() > 6) ? Month.JUNE : Month.DECEMBER;
        return LocalDateTime.of(LocalDate.of(lastHalfYear, lastMonthOfNextHalfYear, lastMonthOfNextHalfYear.maxLength()), LocalTime.MAX);
    }

    /**
     * 下一年开始时间
     *
     * @return
     */
    public static LocalDateTime nextYearStartTime() {
        return LocalDateTime.of(LocalDate.now().plus(1L, ChronoUnit.YEARS).with(TemporalAdjusters.firstDayOfYear()), LocalTime.MIN);
    }

    /**
     * 下一年结束时间
     *
     * @return
     */
    public static LocalDateTime nextYearEndTime() {
        return LocalDateTime.of(LocalDate.now().plus(1L, ChronoUnit.YEARS).with(TemporalAdjusters.lastDayOfYear()), LocalTime.MAX);
    }

    public static void main(String[] args) {
        System.out.println("当前时间：" + now());
        System.out.println("Date 转 LocalDateTime：" + convert(new Date()));
        System.out.println("LocalDateTime 转 Date：" + convert(LocalDateTime.now()));
        System.out.println("今天开始时间：" + todayStartTime());
        System.out.println("今天结束时间：" + todayEndTime());
        System.out.println("昨天开始时间：" + yesterdayStartTime());
        System.out.println("昨天结束时间：" + yesterdayEndTime());
        System.out.println("最近7天开始时间：" + last7DaysStartTime());
        System.out.println("最近7天结束时间：" + last7DaysEndTime());
        System.out.println("最近30天开始时间：" + last30DaysStartTime());
        System.out.println("最近30天天结束时间：" + last30DaysEndTime());
        System.out.println("最近一年开始时间：" + last1YearStartTime());
        System.out.println("最近一年结束时间：" + last1YearEndTime());
        System.out.println("本周开始时间：" + weekStartTime());
        System.out.println("本周结束时间：" + weekEndTime());
        System.out.println("本月开始时间：" + monthStartTime());
        System.out.println("本月结束时间：" + monthEndTime());
        System.out.println("本季度开始时间：" + quarterStartTime());
        System.out.println("本季度结束时间：" + quarterEndTime());
        System.out.println("本半年开始时间：" + halfYearStartTime());
        System.out.println("本半年结束时间：" + halfYearEndTime());
        System.out.println("本年开始时间：" + yearStartTime());
        System.out.println("本年结束时间：" + yearEndTime());
        System.out.println("上周开始时间：" + lastWeekStartTime());
        System.out.println("上周结束时间：" + lastWeekEndTime());
        System.out.println("上月开始时间：" + lastMonthStartTime());
        System.out.println("上月结束时间：" + lastMonthEndTime());
        System.out.println("上季度开始时间：" + lastQuarterStartTime());
        System.out.println("上季度结束时间：" + lastQuarterEndTime());
        System.out.println("上半年开始时间：" + lastHalfYearStartTime());
        System.out.println("上半年结束时间：" + lastHalfYearEndTime());
        System.out.println("上一年开始时间：" + lastYearStartTime());
        System.out.println("上一年结束时间：" + lastYearEndTime());
        System.out.println("下周开始时间：" + nextWeekStartTime());
        System.out.println("下周结束时间：" + nextWeekEndTime());
        System.out.println("下月开始时间：" + nextMonthStartTime());
        System.out.println("下月结束时间：" + nextMonthEndTime());
        System.out.println("下季度开始时间：" + nextQuarterStartTime());
        System.out.println("下季度结束时间：" + nextQuarterEndTime());
        System.out.println("下半年开始时间：" + nextHalfYearStartTime());
        System.out.println("下半年结束时间：" + nextHalfYearEndTime());
        System.out.println("下一年开始时间：" + nextYearStartTime());
        System.out.println("下一年结束时间：" + nextYearEndTime());
    }

}

LocalDate,LocalDateTime获取每周，每月，每年的第一天和最后一天，获取一周七天的日期，获取每月的所有日期

最近再弄日历相关的东西，然后就在获取每月所有日期，每周所有日期，每周，每月，每年的第一天和最后一天等，工具类没有这些方法，就写下来记录一下：

    /**
     * 一周的第一天
     *
     * @param localDate 当地日期
     * @return {@link LocalDate}
     */
    public static LocalDate firstDayOfWeek(LocalDate localDate){
        return localDate.with(DayOfWeek.MONDAY);
    }

    /**
     * 一周的最后一天
     *
     * @param localDate 当地日期
     * @return {@link LocalDate}
     */
    public static LocalDate lastDayOfWeek(LocalDate localDate){
        return localDate.with(DayOfWeek.SUNDAY);
    }

    /**
     * 月的第一天
     *
     * @param localDate 当地日期
     * @return {@link LocalDate}
     */
    public static LocalDate firstDayOfMonth(LocalDate localDate){
        return localDate.with(TemporalAdjusters.firstDayOfMonth());
    }

    /**
     * 月的最后一天
     *
     * @param localDate 当地日期
     * @return {@link LocalDate}
     */
    public static LocalDate lastDayOfMonth(LocalDate localDate){
        return localDate.with(TemporalAdjusters.lastDayOfMonth());
    }

    /**
     * 每年的第一天
     *
     * @param localDate 当地日期
     * @return {@link LocalDate}
     */
    public static LocalDate firstDayOfYear(LocalDate localDate){
        return localDate.with(TemporalAdjusters.firstDayOfYear());
    }

    /**
     * 每年的最后一天
     *
     * @param localDate 当地日期
     * @return {@link LocalDate}
     */
    public static LocalDate lastDayOfYear(LocalDate localDate){
        return localDate.with(TemporalAdjusters.lastDayOfYear());
    }


    /**
     * 每周的所有日期  即周一到周日
     *
     * @param localDate 当地日期
     * @return {@link List<LocalDate>}
     */
    public static List<LocalDate> allDaysOfWeek(LocalDate localDate){
        List<LocalDate> allDays=new ArrayList<>();
        allDays.add(localDate.with(DayOfWeek.MONDAY));
        allDays.add(localDate.with(DayOfWeek.TUESDAY));
        allDays.add(localDate.with(DayOfWeek.WEDNESDAY));
        allDays.add(localDate.with(DayOfWeek.THURSDAY));
        allDays.add(localDate.with(DayOfWeek.FRIDAY));
        allDays.add(localDate.with(DayOfWeek.SATURDAY));
        allDays.add(localDate.with(DayOfWeek.SUNDAY));
        return allDays;
    }

    /**
     * 每月的所有日期  即1日到31日
     *
     * @param localDate 当地日期
     * @return {@link List<LocalDate>}
     */
    public static List<LocalDate> allDaysOfMonth(LocalDate localDate){
        List<LocalDate> allDays=new ArrayList<>();
        LocalDate firstDayOfMonth = firstDayOfMonth(localDate);
        LocalDate lastDayOfMonth = lastDayOfMonth(localDate);
        allDays.add(firstDayOfMonth);
        int i = 1;
        LocalDate temp = firstDayOfMonth;
        while (!temp.isEqual(lastDayOfMonth)){
            LocalDate day = firstDayOfMonth.plusDays(i);
            allDays.add(day);
            temp=day;
            i++;
        }
        return allDays;
    }

如何获取农历日期，生肖，传统节日

hutool工具包有相关的现成的工具包可以使用！！！！

LocalDateTime获取当前月的第一天和最后一天

		DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd 		HH:mm:ss");
        LocalDateTime now = LocalDateTime.now();
        LocalDateTime firstday = now.with(TemporalAdjusters.firstDayOfMonth()).withHour(0).withMinute(0).withSecond(0);
        LocalDateTime lastDay = now.with(TemporalAdjusters.lastDayOfMonth()).withHour(23).withMinute(59).withSecond(59);