[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。
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
在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.stream
或java.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很有趣,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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