日期处理工具类

package com.teradata.springboot.util;


import cn.hutool.core.date.DateField;
import cn.hutool.core.date.DateTime;
import cn.hutool.core.date.DateUtil;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class TimeUtil {
    public static final String YYYY_MM_DD = "yyyyMMdd";

    /**
     * @param time 2030-04-03 20:00:00
     * @return true
     */
    public static boolean isFuture(String time) {
        long now = System.currentTimeMillis();
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date;
        try {
            date = simpleDateFormat.parse(time);
            long ts = date.getTime();
            return ts > now;
        } catch (ParseException e) {
            return false;
        }

    }

    public static boolean isPast(String endTime) {
        return !isFuture(endTime);
    }

    /**
     * 判断现在的时间是否处于 begin-end之间
     *
     * @param begin 800
     * @param end   2030
     * @return 若处于8:00- 20:30之间，则返回true
     */
    public static boolean nowIsInTimeRange(int begin, int end) {
        int hHmm = Integer.parseInt(new SimpleDateFormat("HHmm").format(new Date()));
        return begin <= hHmm && hHmm <= end;
    }

    /**
     * 获取n秒前的yyyy-MM-dd HH:mm:ss 格式数据
     *
     * @param seconds 多少秒前
     */
    public static String before(long seconds) {
        Date date = new Date();
        long time = date.getTime();
        time -= seconds * 1000;
        date.setTime(time);
        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date);
    }

    /**
     * 获取n秒前的yyyy-MM-dd HH:mm:ss 格式数据
     *
     * @param now     从某个时刻开始 2020-10-10 10:00:00
     * @param seconds 多少秒前
     */
    public static String before(String now, long seconds) throws ParseException {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date nowDate = simpleDateFormat.parse(now);
        long time = nowDate.getTime();
        time -= seconds * 1000;
        nowDate.setTime(time);
        return simpleDateFormat.format(nowDate);
    }

    /**
     * 获取n秒后的yyyy-MM-dd HH:mm:ss 格式数据
     *
     * @param now     从某个时刻开始 2020-10-10 10:00:00
     * @param seconds 多少秒前
     */
    public static String after(String now, long seconds) throws ParseException {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date nowDate = simpleDateFormat.parse(now);
        long time = nowDate.getTime();
        time += seconds * 1000;
        nowDate.setTime(time);
        return simpleDateFormat.format(nowDate);
    }

    /**
     * 若为 0点到12点，（不包括0点包括12点） 则返回当天0点
     * 若为 12点到24点，(不包括12点包括0点） 则返回当天12点
     *
     * @param time time
     */
    public static String getStartHalfDay(String time) throws ParseException {
        Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(time);
        int hHmm = Integer.parseInt(new SimpleDateFormat("HHmm").format(date));
        if (hHmm <= 12_00) {
            return new SimpleDateFormat("yyyy-MM-dd 00:00:00").format(date);
        } else {
            return new SimpleDateFormat("yyyy-MM-dd 12:00:00").format(date);
        }
    }

    /**
     * 若为 0点到12点，（不包括0点包括12点） 则返回当天12点
     * 若为 12点到24点，(不包括12点包括0点） 则返回次天0点
     *
     * @param time time
     */
    public static String getEndHalfDay(String time) throws ParseException {
        Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(time);
        int hHmm = Integer.parseInt(new SimpleDateFormat("HHmm").format(date));
        if (hHmm <= 12_00) {
            return new SimpleDateFormat("yyyy-MM-dd 12:00:00").format(date);
        } else {
            String format = new SimpleDateFormat("yyyy-MM-dd 00:00:00").format(date);
            Date parse = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(format);
            long l = parse.getTime() + 24 * 60 * 60 * 1000;
            parse.setTime(l);
            return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(parse);
        }
    }

    public static String timeChange(String time, String beforeFormat, String afterFormat) throws ParseException {
        Date parse;
        parse = new SimpleDateFormat(beforeFormat).parse(time);
        return new SimpleDateFormat(afterFormat).format(parse);

    }


    /**
     * 获取昨天0点的数据
     *
     * @param today 2020/10/11 12:10:00
     * @return 2020/10/10 00:00:00
     */
    public static String getYesterday0OClock(String today) throws ParseException {
        Date date = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").parse(today);
        date.setTime(date.getTime() - 24 * 60 * 60 * 1000);
        return new SimpleDateFormat("yyyy/MM/dd 00:00:00").format(date);
    }

    /**
     * 获取七天前0点的数据
     *
     * @param today 2020/10/11 12:10:00
     * @return 2020/10/10 00:00:00
     */
    public static String getLastWeek0OClock(String today) throws ParseException {
        Date date = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").parse(today);
        date.setTime(date.getTime() - 7 * 24 * 60 * 60 * 1000);
        return new SimpleDateFormat("yyyy/MM/dd 00:00:00").format(date);
    }


    /**
     * 获取今天0点的数据
     *
     * @param today 2020/10/10 12:10:00
     * @return 2020/10/10 00:00:00
     */
    public static String getToday0OClock(String today) throws ParseException {
        Date date = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").parse(today);
        date.setTime(date.getTime() - 24 * 60 * 60 * 1000);
        return new SimpleDateFormat("yyyy/MM/dd 00:00:00").format(date);
    }

    public static String after(int i) {
        return before(-i);
    }

    public static String getOfsetMonyyyyMMdd(int ofset) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat(YYYY_MM_DD);
        Date parse = new Date();
        Calendar cal = Calendar.getInstance();
        cal.setTime(parse);
        cal.add(Calendar.MONTH, -1 * ofset);

        return sdf.format(cal.getTime());
    }
    public static String getYesterdayByyyyyMMMdd(String day) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat(YYYY_MM_DD);
        Date date = sdf.parse(day);
        return DateUtil.offsetDay(date, -1).toString(YYYY_MM_DD);
    }

    public static String getTodayByyyyyMMdd() {
        return DateUtil.format(DateUtil.date(), "yyyyMMdd");
    }

    public static String getYesterdayByyyyyMMMdd(){
        return DateUtil.format(DateUtil.yesterday(), "yyyyMMdd");    }    


public static String getTodayByyyyy_MM_dd(){        
return DateUtil.format(DateUtil.date(),"yyyy-MM-dd");    }    


public static String getToday(){        
return DateUtil.format(DateUtil.date(),"yyyy-MM-dd HH:mm:ss");    }    

public static String getDay(){        
return DateUtil.format(DateUtil.date(),"yyyyMMdd");    }    


/**
     * 根据时间戳去生成年月日
*
     * @param offset 偏移天数
* @return
     */
public static long getYYYYMMddByOffset(long offset) {        
long timeStamp = System.currentTimeMillis();        
long l = timeStamp + offset * DAY;        
return getYYYYMMddByTimeStamp(l);    }    




public static String getYYYYMMByOffset(int i){        
DateTime dataTime=DateUtil.offset(DateUtil.date(), DateField.MONTH,i);        
return DateUtil.format(dataTime,"yyyyMM");    }    

/**
     * 根据时间戳去生成年月日
*
     * @param timeStamp 1579154871974
     * @return 20200116
     */
public static long getYYYYMMddByTimeStamp(long timeStamp) {        
Date date = new Date();        
date.setTime(timeStamp);        
return Long.parseLong(new SimpleDateFormat(YYYY_MM_DD).format(date));    }    


public static String getOfsetMonyyyyMMdd2(int ofset) throws ParseException {        
SimpleDateFormat sdf = new SimpleDateFormat(YYYY_MM_DD);        
Date parse = new Date();        
Calendar cal = Calendar.getInstance();        
cal.setTime(parse);        
cal.add(Calendar.MONTH, -1 * ofset);        

return sdf.format(cal.getTime());    }    




public static final long DAY = 1000 * 60 * 60 * 24;}