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如何獲取 java 中兩個日期之間的日期列表

[英]how to get a list of dates between two dates in java

我想要一個介於開始日期和結束日期之間的日期列表。

結果應該是所有日期的列表,包括開始日期和結束日期。

早在 2010 年,我建議為此使用Joda-Time

請注意,Joda-Time 現在處於維護模式。 從 1.8 (2014) 開始,您應該使用java.time

一次添加一天,直到到達結束日期:

int days = Days.daysBetween(startDate, endDate).getDays();
List<LocalDate> dates = new ArrayList<LocalDate>(days);  // Set initial capacity to `days`.
for (int i=0; i < days; i++) {
    LocalDate d = startDate.withFieldAdded(DurationFieldType.days(), i);
    dates.add(d);
}

實現自己的迭代器也不會太難,那會更好。

java.time 包

如果您使用的是Java 8 ,則有一種更簡潔的方法。 Java 8 中新的java.time 包結合了Joda-Time API 的特性。

可以使用以下代碼解決您的要求:

String s = "2014-05-01";
String e = "2014-05-10";
LocalDate start = LocalDate.parse(s);
LocalDate end = LocalDate.parse(e);
List<LocalDate> totalDates = new ArrayList<>();
while (!start.isAfter(end)) {
    totalDates.add(start);
    start = start.plusDays(1);
}

獲取日期之間的天數,包括在內。

public static List<Date> getDaysBetweenDates(Date startdate, Date enddate)
{
    List<Date> dates = new ArrayList<Date>();
    Calendar calendar = new GregorianCalendar();
    calendar.setTime(startdate);

    while (calendar.getTime().before(enddate))
    {
        Date result = calendar.getTime();
        dates.add(result);
        calendar.add(Calendar.DATE, 1);
    }
    return dates;
}

編輯:Joda-Time 現在已棄用,將答案更改為使用 Java 8。

這是使用流的 Java 8 方式。

List<LocalDate> daysRange = Stream.iterate(startDate, date -> date.plusDays(1)).limit(numOfDays).collect(Collectors.toList());

請找到以下代碼。

List<Date> dates = new ArrayList<Date>();

String str_date ="27/08/2010";
String end_date ="02/09/2010";

DateFormat formatter ; 

formatter = new SimpleDateFormat("dd/MM/yyyy");
Date  startDate = (Date)formatter.parse(str_date); 
Date  endDate = (Date)formatter.parse(end_date);
long interval = 24*1000 * 60 * 60; // 1 hour in millis
long endTime =endDate.getTime() ; // create your endtime here, possibly using Calendar or Date
long curTime = startDate.getTime();
while (curTime <= endTime) {
    dates.add(new Date(curTime));
    curTime += interval;
}
for(int i=0;i<dates.size();i++){
    Date lDate =(Date)dates.get(i);
    String ds = formatter.format(lDate);    
    System.out.println(" Date is ..." + ds);
}

輸出:

日期是 ...27/08/2010
日期是 ...28/08/2010
日期是 ...29/08/2010
日期是 ...30/08/2010
日期是 ...31/08/2010
日期是 ...01/09/2010
日期是 ...02/09/2010

推薦日期流

Java 9 中,您可以使用以下新方法LocalDate::datesUntil

LocalDate start = LocalDate.of(2017, 2, 1);
LocalDate end = LocalDate.of(2017, 2, 28);

Stream<LocalDate> dates = start.datesUntil(end.plusDays(1));
List<LocalDate> list = dates.collect(Collectors.toList());

新方法datesUntil(...)使用唯一的結束日期,因此顯示了添加一天的技巧。

獲得流后,您可以利用java.util.streamjava.util.function提供的所有功能。 與基於自定義 for 或 while 循環的早期方法相比,使用流變得如此簡單。


或者,如果您正在尋找一種基於流的解決方案,該解決方案默認在包含日期上運行,但也可以以其他方式進行配置,那么您可能會發現我的庫Time4J 中的類DateInterval有趣,因為它提供了許多圍繞日期流的特殊功能,包括高性能拆分器這比在 Java-9 中更快:

PlainDate start = PlainDate.of(2017,  2, 1);
PlainDate end = start.with(PlainDate.DAY_OF_MONTH.maximized());
Stream<PlainDate> stream = DateInterval.streamDaily(start, end);

或者在整月的情況下更簡單:

Stream<PlainDate> februaryDates = CalendarMonth.of(2017, 2).streamDaily();
List<LocalDate> list = 
    februaryDates.map(PlainDate::toTemporalAccessor).collect(Collectors.toList());

使用 Java 8

public Stream<LocalDate> getDaysBetween(LocalDate startDate, LocalDate endDate) {
    return IntStream.range(0, (int) DAYS.between(startDate, endDate)).mapToObj(startDate::plusDays);
}

像這樣的事情絕對應該有效:

private List<Date> getListOfDaysBetweenTwoDates(Date startDate, Date endDate) {
    List<Date> result = new ArrayList<Date>();
    Calendar start = Calendar.getInstance();
    start.setTime(startDate);
    Calendar end = Calendar.getInstance();
    end.setTime(endDate);
    end.add(Calendar.DAY_OF_YEAR, 1); //Add 1 day to endDate to make sure endDate is included into the final list
    while (start.before(end)) {
        result.add(start.getTime());
        start.add(Calendar.DAY_OF_YEAR, 1);
    }
    return result;
}

使用Lamma,它在 Java 中是這樣的:

    for (Date d: Dates.from(2014, 6, 29).to(2014, 7, 1).build()) {
        System.out.println(d);
    }

輸出是:

    Date(2014,6,29)
    Date(2014,6,30)
    Date(2014,7,1)
 public static List<Date> getDaysBetweenDates(Date startDate, Date endDate){
        ArrayList<Date> dates = new ArrayList<Date>();
        Calendar cal1 = Calendar.getInstance();
        cal1.setTime(startDate);

        Calendar cal2 = Calendar.getInstance();
        cal2.setTime(endDate);

        while(cal1.before(cal2) || cal1.equals(cal2))
        {
            dates.add(cal1.getTime());
            cal1.add(Calendar.DATE, 1);
        }
        return dates;
    }

一種解決方案是創建一個Calendar實例,然后開始一個循環,增加它的Calendar.DATE字段,直到達到所需的日期。 此外,在每個步驟中,您都應該創建一個Date實例(帶有相應的參數),並將其放入您的列表中。

一些臟代碼:

    public List<Date> getDatesBetween(final Date date1, final Date date2) {
    List<Date> dates = new ArrayList<Date>();

    Calendar calendar = new GregorianCalendar() {{
        set(Calendar.YEAR, date1.getYear());
        set(Calendar.MONTH, date1.getMonth());
        set(Calendar.DATE, date1.getDate());
    }};

    while (calendar.get(Calendar.YEAR) != date2.getYear() && calendar.get(Calendar.MONTH) != date2.getMonth() && calendar.get(Calendar.DATE) != date2.getDate()) {
        calendar.add(Calendar.DATE, 1);
        dates.add(new Date(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DATE)));
    }

    return dates;
}

使用Joda-Time ,也許更好:

LocalDate dateStart = new LocalDate("2012-01-15");
LocalDate dateEnd = new LocalDate("2012-05-23");
// day by day:
while(dateStart.isBefore(dateEnd)){
    System.out.println(dateStart);
    dateStart = dateStart.plusDays(1);
}

這是我的解決方案......非常簡單:)

List<Date> dates = new ArrayList<Date>();
String str_date = "DD/MM/YYYY";
String end_date = "DD/MM/YYYY";
DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
Date startDate = (Date)formatter.parse(str_date); 
Date endDate = (Date)formatter.parse(end_date);
long interval = 1000 * 60 * 60; // 1 hour in milliseconds
long endTime = endDate.getTime() ; // create your endtime here, possibly using Calendar or Date
long curTime = startDate.getTime();

while (curTime <= endTime) {
    dates.add(new Date(curTime));
    curTime += interval;
}
for (int i = 0; i < dates.size(); i++){
    Date lDate = (Date)dates.get(i);
    String ds = formatter.format(lDate);    
    System.out.println("Date is ..." + ds);
    //Write your code for storing dates to list
}

就像@folone,但正確

private static List<Date> getDatesBetween(final Date date1, final Date date2) {
    List<Date> dates = new ArrayList<>();
    Calendar c1 = new GregorianCalendar();
    c1.setTime(date1);
    Calendar c2 = new GregorianCalendar();
    c2.setTime(date2);
    int a = c1.get(Calendar.DATE);
    int b = c2.get(Calendar.DATE);
    while ((c1.get(Calendar.YEAR) != c2.get(Calendar.YEAR)) || (c1.get(Calendar.MONTH) != c2.get(Calendar.MONTH)) || (c1.get(Calendar.DATE) != c2.get(Calendar.DATE))) {
        c1.add(Calendar.DATE, 1);
        dates.add(new Date(c1.getTimeInMillis()));
    }
    return dates;
}

您還可以查看Date.getTime() API。 這給出了一個可以添加增量的 long 。 然后創建一個新的日期。

List<Date> dates = new ArrayList<Date>();
long interval = 1000 * 60 * 60; // 1 hour in millis
long endtime = ; // create your endtime here, possibly using Calendar or Date
long curTime = startDate.getTime();
while (curTime <= endTime) {
  dates.add(new Date(curTime));
  curTime += interval;
}

也許 apache commons 在 DateUtils 中有這樣的東西,或者他們也有一個 CalendarUtils :)

編輯

如果您的時間間隔不完美,則可能無法包括開始和結束日期:)

這是獲取日期列表的簡單解決方案

import java.io.*;
import java.util.*;
import java.text.SimpleDateFormat;  
public class DateList
{

public static SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");

 public static void main (String[] args) throws java.lang.Exception
 {

    Date dt = new Date();
    System.out.println(dt);

        List<Date> dates = getDates("2017-01-01",dateFormat.format(new Date()));
        //IF you don't want to reverse then remove Collections.reverse(dates);
         Collections.reverse(dates);
        System.out.println(dates.size());
    for(Date date:dates)
    {
        System.out.println(date);
    }
 }
 public static List<Date> getDates(String fromDate, String toDate)
 {
    ArrayList<Date> dates = new ArrayList<Date>();

    try {

        Calendar fromCal = Calendar.getInstance();
        fromCal.setTime(dateFormat .parse(fromDate));

        Calendar toCal = Calendar.getInstance();
        toCal.setTime(dateFormat .parse(toDate));

        while(!fromCal.after(toCal))
        {
            dates.add(fromCal.getTime());
            fromCal.add(Calendar.DATE, 1);
        }


    } catch (Exception e) {
        System.out.println(e);
    }
    return dates;
 }
}

ThreeTen-Extra庫中的LocalDateRange class 表示日期范圍,可用於此目的:

LocalDateRange.ofClosed(startDate, endDate).stream().toList();

尾遞歸版本:

public static void datesBetweenRecursive(Date startDate, Date endDate, List<Date> dates) {
    if (startDate.before(endDate)) {
        dates.add(startDate);
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(startDate);
        calendar.add(Calendar.DATE, 1);
        datesBetweenRecursive(calendar.getTime(), endDate, dates);
    }
}

增強上述解決方案之一。 由於將 1 天添加到結束日期有時會在結束日期之后增加一天。

public static List getDaysBetweenDates(Date startdate, Date enddate)
    {
        List dates = new ArrayList();
        Calendar startDay = new GregorianCalendar();
        calendar.setTime(startdate);
        Calendar endDay = new GregorianCalendar();
        endDay.setTime(enddate);
        endDay.add(Calendar.DAY_OF_YEAR, 1);
        endDay.set(Calendar.HOUR_OF_DAY, 0);
        endDay.set(Calendar.MINUTE, 0);
        endDay.set(Calendar.SECOND, 0);
        endDay.set(Calendar.MILLISECOND, 0);

        while (calendar.getTime().before(endDay.getTime())) {
            Date result = startDay.getTime();
            dates.add(result);
            startDay.add(Calendar.DATE, 1);
        }
        return dates;
    }

這是我在兩個日期之間獲取日期的方法,包括 / wo 包括工作日。 它還將源和所需的日期格式作為參數。

public static List<String> getAllDatesBetweenTwoDates(String stdate,String enddate,String givenformat,String resultformat,boolean onlybunessdays) throws ParseException{
        DateFormat sdf;
        DateFormat sdf1;
        List<Date> dates = new ArrayList<Date>();
        List<String> dateList = new ArrayList<String>();
          SimpleDateFormat checkformat = new SimpleDateFormat(resultformat); 
          checkformat.applyPattern("EEE");  // to get Day of week
        try{
            sdf = new SimpleDateFormat(givenformat);
            sdf1 = new SimpleDateFormat(resultformat);
            stdate=sdf1.format(sdf.parse(stdate));
            enddate=sdf1.format(sdf.parse(enddate));

            Date  startDate = (Date)sdf1.parse( stdate); 
            Date  endDate = (Date)sdf1.parse( enddate);
            long interval = 24*1000 * 60 * 60; // 1 hour in millis
            long endTime =endDate.getTime() ; // create your endtime here, possibly using Calendar or Date
            long curTime = startDate.getTime();
            while (curTime <= endTime) {
                dates.add(new Date(curTime));
                curTime += interval;
            }
            for(int i=0;i<dates.size();i++){
                Date lDate =(Date)dates.get(i);
                String ds = sdf1.format(lDate);   
                if(onlybunessdays){
                    String day= checkformat.format(lDate); 
                    if(!day.equalsIgnoreCase("Sat") && !day.equalsIgnoreCase("Sun")){
                          dateList.add(ds);
                    }
                }else{
                      dateList.add(ds);
                }

                //System.out.println(" Date is ..." + ds);

            }


        }catch(ParseException e){
            e.printStackTrace();
            throw e;
        }finally{
            sdf=null;
            sdf1=null;
        }
        return dateList;
    }

方法調用將類似於:

public static void main(String aregs[]) throws Exception {
        System.out.println(getAllDatesBetweenTwoDates("2015/09/27","2015/10/05","yyyy/MM/dd","dd-MM-yyyy",false));
    }

您可以找到演示代碼:單擊此處

List<LocalDate> totalDates = new ArrayList<>();
popularDatas(startDate, endDate, totalDates);
System.out.println(totalDates);

private void popularDatas(LocalDate startDate, LocalDate endDate, List<LocalDate> datas) {
    if (!startDate.plusDays(1).isAfter(endDate)) {
        popularDatas(startDate.plusDays(1), endDate, datas);
    } 
    datas.add(startDate);
}

遞歸解

這將添加兩個日期之間的所有日期,並將添加當前日期,然后將根據循環條件添加新日期。

private void onDateSet(){
    Calendar endDate = Calendar.getInstance(),startDate = Calendar.getInstance();
    startDate.set(currentYear,currentMonthOfYear,currentDayOfMonth);
    endDate.set(inputYear,inputMonthOfYear,inputDayOfMonth);
    datesToAdd(startDate,endDate);
    }

    //call for get dates list
    private List<Date> datesToAdd(Calendar startDate,Calendar endDate){
                    List<Dates> datesLists = new List<>();
                    while (startDate.get(Calendar.YEAR) != endDate.get(Calendar.YEAR) ||   
                           startDate.get(Calendar.MONTH) != endDate.get(Calendar.MONTH) ||
                           startDate.get(Calendar.DAY_OF_MONTH) != endDate.get(Calendar.DAY_OF_MONTH)) {

                             datesList.add(new Date(startDate.get(Calendar.YEAR), startDate.get(Calendar.MONTH), startDate.get(Calendar.DATE));

                             startDate.add(Calendar.DATE, 1);//increas dates

                         }
                         return datesList;
                }

你可以這樣計算的java9特性

public  List<LocalDate> getDatesBetween (
 LocalDate startDate, LocalDate endDate) {

   return startDate.datesUntil(endDate)
     .collect(Collectors.toList());
}
`` 


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