package com.whyc.util;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.LinkedList;
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import java.util.List;
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/**
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* @Description : 时间工具类
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* @date 2020/10/15
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**/
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public class DateUtil {
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public static SimpleDateFormat YYYY_MM_DD_HH_MM_SS=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
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public static SimpleDateFormat YYYY_MM_DD_HH_MM_SS_UNION=new SimpleDateFormat("yyyyMMddHHmmss");
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public static SimpleDateFormat YYYY_MM_DD=new SimpleDateFormat("yyyy-MM-dd");
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public static List<List<Date>> getMonthTime(Date startTimeDate,Date endTimeDate) throws ParseException {
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List<List<Date>> timeList = new LinkedList<>();
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Calendar startTimeCalendar = Calendar.getInstance();
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startTimeCalendar.setTime(startTimeDate);
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Calendar endTimeCalendar = Calendar.getInstance();
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endTimeCalendar.setTime(endTimeDate);
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//按月份切分时段
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int startY = startTimeCalendar.get(Calendar.YEAR);
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int startM = startTimeCalendar.get(Calendar.MONTH)+1;
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int endY = endTimeCalendar.get(Calendar.YEAR);
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int endM = endTimeCalendar.get(Calendar.MONTH)+1;
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int Y = endY - startY;
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int len = Y*12+(endM-startM)+1;
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Calendar dateTemp = Calendar.getInstance();
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for (int i = 0; i < len; i++) {
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List<Date> SEList = new LinkedList<>();
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dateTemp.setTime(YYYY_MM_DD_HH_MM_SS.parse(startY+"-"+startM+"-01 00:00:00"));
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Date recordTime,recordTime1;
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dateTemp.add(Calendar.MONTH,i);
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recordTime = dateTemp.getTime();
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int lastDay = dateTemp.getActualMaximum(Calendar.DAY_OF_MONTH);
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dateTemp.set(Calendar.DAY_OF_MONTH,lastDay);
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dateTemp.set(Calendar.HOUR_OF_DAY,23);
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dateTemp.set(Calendar.MINUTE,59);
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dateTemp.set(Calendar.SECOND,59);
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recordTime1 = dateTemp.getTime();
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if(i==0){
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recordTime = startTimeDate;
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}
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if(i==len-1){
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recordTime1 = endTimeDate;
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}
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SEList.add(recordTime);
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SEList.add(recordTime1);
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timeList.add(SEList);
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}
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return timeList;
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}
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public static void main(String[] args) throws ParseException {
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Date d1 = YYYY_MM_DD_HH_MM_SS.parse("2021-12-25 14:12:22");
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Date d2 = YYYY_MM_DD_HH_MM_SS.parse("2022-01-10 09:12:22");
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List<List<Date>> monthTime = getMonthTime(d1, d2);
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System.out.println(monthTime);
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}
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}
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