Learn to get all the dates between the two given dates. We will see the solutions in Java 7, Java 8, and Java 9.
1. LocalDate.datesUntil() – Java 9
LocalDate‘s datesUntil() method returns a sequential ordered stream of dates. The returned stream starts from startDate and goes to endDate (exclusive) by an incremental step of 1 day.
LocalDate startDate = LocalDate.now();
LocalDate endDate = startDate.plusMonths(2);
List<LocalDate> listOfDates = startDate.datesUntil(endDate)
.collect(Collectors.toList());
System.out.println(listOfDates.size()); // 61
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2. Stream.iterate() – Java 8
To get all dates, create a stream of dates adding adding 1 to startdate and so on, until end date.
LocalDate startDate = LocalDate.now();
LocalDate endDate = startDate.plusMonths(2);
long numOfDays = ChronoUnit.DAYS.between(startDate, endDate);
List<LocalDate> listOfDates1 = Stream.iterate(startDate, date -> date.plusDays(1))
.limit(numOfDays)
.collect(Collectors.toList());
System.out.println(listOfDates.size()); // 61
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The same kind of stream can be obtained in multiple ways. For example, LongStream is one of those ways.
LocalDate startDate = LocalDate.now();
LocalDate endDate = startDate.plusMonths(2);
long numOfDays = ChronoUnit.DAYS.between(startDate, endDate);
List<LocalDate> listOfDates2 = LongStream.range(0, numOfDays)
.mapToObj(startDate::plusDays)
.collect(Collectors.toList());
System.out.println(listOfDates.size()); // 61
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3. Create dates in while loop – Java 7
To get all dates from startDate to endDate in Java 7, we must write our own custom logic as their is very limited API support in JDK. Or else, consider using 3rd party libraries e.g. Joda-time.
Date todaysDate = new Date();
Date anotherDate = new Date(todaysDate.getTime() + 61*24*60*60*1000l);
List<Date> listOfDates3 = getDaysBetweenDates(todaysDate, anotherDate);
System.out.println(listOfDates3.size()); //61
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;
}
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