LocalDatetimeUtils

package com.test.util;

import java.time.Duration;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Date;
import java.util.Objects;

/**
 * @className: LocalDateTimeUtil
 * @description: LocalDateTime 工具类
 * @author: tanjunjun
 * @date: 2022/7/1
 **/
public class LocalDateTimeUtil {


    /**
     *  计算两个时间相差多少个小时 结束时间 - 开始时间
     * @param start  开始时间
     * @param end   结束时间
     * @return 整数
     */
    public static Long calculateTimeDiff(LocalDateTime start, LocalDateTime end){
        if (Objects.isNull(start) || Objects.isNull(end)) {
            return 0L;
        }
        Duration duration = Duration.between(start,end);
        return duration.toHours();
    }


    /**
     *    date转localDate
     */
    public static LocalDateTime transformLocalDate(Date date){
        Instant instant = date.toInstant();
        ZoneId zone = ZoneId.systemDefault();
        //Date转换为LocalDateTime
        return LocalDateTime.ofInstant(instant, zone);
    }


    /**
     * 获取几天后的当前时间
     * @return
     */
    public static LocalDateTime getOverDays(Long days,LocalDateTime time){
        return time.plusDays(days);
    }

    /**
     * 获取指定日期的的几月几号几点几分几秒
     * @param time
     * @return
     */
    public static LocalDateTime planCompleteTime(LocalDateTime time){
        // 指定月份的4号12点
        return time.withMonth(7).withDayOfMonth(4).withHour(12).withMinute(0).withSecond(0).withNano(0);
    }
}