java 8 LocalDate工具类

package com.wisetv.selectmiddleware.util;

import java.time.*;
import java.time.format.DateTimeFormatter;
import java.time.temporal.TemporalAdjusters;


public class DateTimeUtil {

    /**
     *  计算指定日期的所在周的周一
     * @param localDate
     * @return
     */
    public static LocalDate dayOfWeekMonday(LocalDate localDate){
        return localDate.with(TemporalAdjusters.previousOrSame(DayOfWeek.MONDAY));
    }

    /**
     * 计算指定日期的周末
     * @param localDate
     * @return
     */
    public static LocalDate dayOfWeekSunday(LocalDate localDate){
        return localDate.with(TemporalAdjusters.nextOrSame(DayOfWeek.SUNDAY));
    }

    /**
     * 计算指定日期的月初
     * @param localDate
     * @return
     */
    public static LocalDate dayOfMonthFirst(LocalDate localDate){
        return localDate.with(TemporalAdjusters.firstDayOfMonth());
    }

    /**
     * 计算指定日期的月末
     * @param localDate
     * @return
     */
    public static LocalDate dayOfMonthLast(LocalDate localDate){
        return localDate.with(TemporalAdjusters.lastDayOfMonth());
    }

    /**
     * 计算指定日期的上个月月初
     * @param localDate
     * @return
     */
    public static LocalDate dayOfLastMonthFirst(LocalDate localDate){
        return localDate.minusMonths(1).with(TemporalAdjusters.firstDayOfMonth());
    }

    /**
     * 计算指定日期的上个月月末
     * @param localDate
     * @return
     */
    public static LocalDate dayOfLastMonthLast(LocalDate localDate){
        return localDate.minusMonths(1).with(TemporalAdjusters.lastDayOfMonth());
    }

    /**
     * 计算今年第一天
     * @param localDate
     * @return
     */
    public static LocalDate dayOfYearFirst(LocalDate localDate){
        return localDate.with(TemporalAdjusters.firstDayOfYear());
    }

    /**
     * 计算今年最后一天
     * @param localDate
     * @return
     */
    public static LocalDate dayOfYearLast(LocalDate localDate){
        return localDate.with(TemporalAdjusters.lastDayOfYear());
    }

    /**
     * 计算去年第一天
     * @param localDate
     * @return
     */
    public static LocalDate dayOfLastYearFirst(LocalDate localDate){
        return localDate.minusYears(1).with(TemporalAdjusters.firstDayOfYear());
    }

    /**
     * 计算去年最后一天
     * @param localDate
     * @return
     */
    public static LocalDate dayOfLastYearLast(LocalDate localDate){
        return localDate.minusMonths(1).with(TemporalAdjusters.lastDayOfYear());
    }


    /**
     * 根据格式化字符串格式化日期
     * @param localDate
     * @param pattern
     * @return
     */
    public static String formatDate(LocalDate localDate,String pattern){
        return localDate.format(DateTimeFormatter.ofPattern(pattern));
    }

    /**
     * 根据格式化字符串格式化日期
     * @param localDate
     * @param pattern
     * @return
     */
    public static String formatDateTime(LocalDateTime localDate,String pattern){
        return localDate.format(DateTimeFormatter.ofPattern(pattern));
    }
    /**
     * 将字符串转为日期
     * @param date
     * @param pattern
     * @return
     */
    public static LocalDate parseDate(String date,String pattern){
        LocalDate parse = LocalDate.parse(date, DateTimeFormatter.ofPattern(pattern));
        return parse;
    }

    /**
     * 将字符串转为日期
     * @param date
     * @param pattern
     * @return
     */
    public static LocalDateTime parseDateTime(String date,String pattern){
        LocalDateTime parse = LocalDateTime.parse(date, DateTimeFormatter.ofPattern(pattern));
        return parse;
    }
}