如何获取 java 中两个日期之间的日期列表

Question

I want a list of dates between start date and end date.

The result should be a list of all dates including the start and end date.

Answer 1

Back in 2010, I suggested to use Joda-Time for that.

Note that Joda-Time is now in maintenance mode. Since 1.8 (2014), you should use java.time .

Add one day at a time until reaching the end date:

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);
}

It wouldn't be too hard to implement your own iterator to do this as well, that would be even nicer.

Answer 2

java.time Package

If you are using Java 8 , there is a much cleaner approach. The new java.time package in Java 8 incorporates the features of the Joda-Time API.

Your requirement can be solved using the below code:

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);
}

Answer 3

Get the number of days between dates, inclusive.

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;
}

Answer 4

Streams

Edit: Joda-Time is now deprecated, changed the answer to use Java 8 instead.

Here is the Java 8 way, using streams.

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

Answer 5

please find the below code.

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);
}

output:

Date is ...27/08/2010
Date is ...28/08/2010
Date is ...29/08/2010
Date is ...30/08/2010
Date is ...31/08/2010
Date is ...01/09/2010
Date is ...02/09/2010

Answer 6

Recommending date streams

In Java 9 , you can use following new method, 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());

The new method datesUntil(...) works with an exclusive end date, hence the shown hack to add a day.

Once you have obtained a stream you can exploit all the features offered by java.util.stream - or java.util.function -packages. Working with streams has become so simple compared with earlier approaches based on customized for- or while-loops.

---

Or if you look for a stream-based solution which operates on inclusive dates by default but can also be configured otherwise then you might find the classDateInterval in my library Time4J interesting because it offers a lot of special features around date streams including a performant spliterator which is faster than in Java-9:

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

Or even simpler in case of full months:

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

Answer 7

With java 8

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

Answer 8

Something like this should definitely work:

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;
}

Answer 9

With Lamma it looks like this in Java:

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

and the output is:

    Date(2014,6,29)
    Date(2014,6,30)
    Date(2014,7,1)

Answer 10

 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;
    }

Answer 11

One solution would be to create a Calendar instance, and start a cycle, increasing it's Calendar.DATE field until it reaches the desired date. Also, on each step you should create a Date instance (with corresponding parameters), and put it to your list.

Some dirty code:

    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;
}

Answer 12

With Joda-Time , maybe it's better:

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);
}

It's my solution.... very easy :)

Answer 13

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
}

Answer 14

Like as @folone, but correct

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;
}

Answer 15

You can also look at the Date.getTime() API. That gives a long to which you can add your increment. Then create a new Date.

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;
}

and maybe apache commons has something like this in DateUtils, or perhaps they have a CalendarUtils too :)

EDIT

including the start and enddate may not be possible if your interval is not perfect :)

Answer 16

This is simple solution for get a list of dates

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;
 }
}

Answer 17

The LocalDateRange class in the ThreeTen-Extra library represents a range of dates, and can be used for this purpose:

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

Answer 18

A tail-recursive version:

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);
    }
}

Answer 19

Enhancing one of the above solutions. As adding 1 day to end date sometimes adds an extra day beyond the end date.

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;
    }

Answer 20

Here is my method for getting dates between two dates, including / wo including business days. It also takes source and desired date format as parameter.

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;
    }

And the method call would be like :

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));
    }

You can find the demo code : Click Here

Answer 21

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);
}

Recursive solution

Answer 22

This will add all dates between two dates and It will add current dates and then new dates will be added based on loop condition.

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;
                }

Answer 23

java9 features you can calculate like this

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

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