JAVA Date時間工具類，底層使用LocalDateTime來進行轉換封裝

import java.text.ParseException;
import java.time.*;
import java.time.format.DateTimeFormatter;
import java.time.temporal.TemporalAdjusters;
import java.util.Date;

/**
 * @description: 時間工具類
 * @author: kejie.huang
 * @date: Created in 2019/10/10 11:08
 * @version:
 * @modified By:
 */
public class DateUtils {
    public static final String DATE_FORMART_YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss";
    /**
     * 指定日期加上天數後的日期
     * @param num 爲增長的天數
     * @param currentDate 建立時間
     * @return
     * @throws ParseException
     */
    public static Date plusDay(int num, Date currentDate) {
        LocalDateTime localDateTime = dateConvertLocalDateTime(currentDate);
        localDateTime = localDateTime.plusDays(num);
        return localDateTimeConvertDate(localDateTime);
    }

    /**
     * @description 根據時間字符串轉換成
     * @return
     * @author kejie.huang
     * @date 2019/10/10 11:19
     */
    public static Date dateStrConvertDate(String currentDate, String formateStr) {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(formateStr);
        LocalDateTime localDateTime = LocalDateTime.parse(currentDate, dateTimeFormatter);
        return localDateTimeConvertDate(localDateTime);
    }

    /**
     * @return
     * @description 根據date轉換成localDateTime
     * @author kejie.huang
     * @date 2019/10/14 14:31
     */
    private static LocalDateTime dateConvertLocalDateTime(Date date) {
        LocalDateTime localDateTime = Instant.ofEpochMilli(date.getTime()).atZone(ZoneId.systemDefault()).toLocalDateTime();
        return localDateTime;
    }

    /**
     * @return
     * @description 方法描述 根據localDateTime轉換成date
     * @author kejie.huang
     * @date 2019/10/14 14:31
     */
    public static Date localDateTimeConvertDate(LocalDateTime localDateTime) {
        return Date.from(getZonedDateTimeByLocalDateTime(localDateTime).toInstant());
    }
    /**
     * @description 根據時間轉換成時間字符串
     * @return
     * @author kejie.huang
     * @date 2019/10/10 11:19
     */
    public static String formatDateToParse(Date currentDate, String formateStr) {
        LocalDateTime localDateTime = dateConvertLocalDateTime(currentDate);
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(formateStr);
        return dateTimeFormatter.format(localDateTime);
    }
    /**
     * @description 根據開始時間，結束時間進行對比
     * @param startDate 開始時間
     * @param endDate 結束時間
     * @return
     * @author kejie.huang
     * @date 2019/10/10 11:16
     */
    public static boolean compareDay(Date startDate, Date endDate) {
        return startDate.before(endDate);
    }

    /**
     * @title DateUtils
     * @Description獲取本月第一天
     * @author kejie.huang
     * @Date 2019/10/14 10:52
     * @Copyright 2019-2020
     */
    public static Date getMonthFirstDay() {
        LocalDateTime date = LocalDateTime.now();
        LocalDateTime firstday = date.with(TemporalAdjusters.firstDayOfMonth());
        return localDateTimeConvertDate(firstday);
    }

    /**
     * @title DateUtils
     * @Description獲取本月最後一天
     * @author kejie.huang
     * @Date 2019/10/14 10:52
     * @Copyright 2019-2020
     */
    public static Date getMonthLastDay() {
        LocalDateTime date = LocalDateTime.now();
        LocalDateTime lastday = date.with(TemporalAdjusters.lastDayOfMonth());
        return localDateTimeConvertDate(lastday);
    }

    /**
     * @title DateUtils
     * @Description 根據localDateTime轉換成ZonedDateTime對象，用於把localDatTime轉成Date
     * @author kejie.huang
     * @Date 2019/10/14 11:03
     * @Copyright 2019-2020
     */
    public static ZonedDateTime getZonedDateTimeByLocalDateTime(LocalDateTime localDateTime) {
        ZoneId zoneId = ZoneId.systemDefault();
        ZonedDateTime zonedDateTime = localDateTime.atZone(zoneId);
        return zonedDateTime;
    }

    /**
     * @return
     * @description 得到某天最大時間 2019-10-14 23:59:59
     * @author kejie.huang
     * @date 2019/10/14 10:56
     */
    public static Date getEndOfDay(Date date) {
        LocalDateTime localDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(date.getTime()), ZoneId.systemDefault());
        ;
        LocalDateTime endOfDay = localDateTime.with(LocalTime.MAX);
        return localDateTimeConvertDate(endOfDay);
    }

    /**
     * @return
     * @description 得到某天最小時間 2019-10-14 00:00:00
     * @author kejie.huang
     * @date 2019/10/14 10:57
     */
    public static Date getStartOfDay(Date date) {
        LocalDateTime localDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(date.getTime()), ZoneId.systemDefault());
        LocalDateTime startOfDay = localDateTime.with(LocalTime.MIN);
        return localDateTimeConvertDate(startOfDay);
    }
}