Question

我尝试获取两个日期之间的日期列表。但是，列表中的所有值都是开始日期。

例如

datefrom = 06-10-2017

dateto = 10-10-2017

==＆GT;列表的所有值都是datefrom（06-10-2017）

预期---------------------------------------实际

日期[0] = 06-10-2017 ------------------- dates [0] = 06-10-2017

日期[1] = 07-10-2017 ------------------- dates [1] = 06-10-2017

日期[2] = 08-10-2017 ------------------- dates [2] = 06-10-2017

日期[3] = 09-10-2017 ------------------- dates [3] = 06-10-2017

日期[4] = 10-10-2017 ------------------- dates [4] = 06-10-2017

任何帮助都将不胜感激。

public class fragTable extends Fragment{
...
private String mdateFrom = "06-10-2017";
private String mdateTo = "10-10-2017";

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    List<String> dates = new ArrayList<String>();    
    dates = getDaysBetweenDates(stringToDaTe(mdateFrom),stringToDaTe(mdateTo));
}

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

    while (calendar.getTime().before(enddate))
    {
        Date result = calendar.getTime();
        dates.add( datetoString(result));
        calendar.add(Calendar.DATE, 1);
    }
    return dates;
}
 //Convert String to Date  
 public Date stringToDaTe(String dateString)
{
    SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
    Date date = new Date();
    try {
        date = sdf.parse(dateString);
    } catch (ParseException e) {
        e.printStackTrace();
    }
    return date;
}
  //Convert Date to String
  public String datetoString(Date date)
{
    SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy");
    Date today = Calendar.getInstance().getTime();
    String result = df.format(today);
    return result;
}
}

Answer 1

检查dateToString方法：

public String datetoString(Date date)
{
    SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy");
    Date today = Calendar.getInstance().getTime();
    String result = df.format(today);       // <= You're actually formatting "today" date, not "date"
    return result;
}

将该行更改为

String result = df.format(date);

你的问题应该解决

Answer 2

以下是获取2个日期之间日期的代码。

public class test {
    private static String mdateFrom = "06-10-2017";
    private static String mdateTo = "10-10-2017";

    public static void main(String[] args) {
        List<String> dates = getDaysBetweenDates(stringToDaTe(mdateFrom), stringToDaTe(mdateTo));
        System.out.println(dates);
    }

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

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

    public static Date stringToDaTe(String dateString) {
        SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
        Date date = new Date();
        try {
            date = sdf.parse(dateString);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return date;
    }

    public static String formatDate(Date result) {
        String date = "";
        DateFormat df = new SimpleDateFormat("dd-MM/yyyy");
        date = df.format(result);
        return date;
    }
}

输出是：

[06-10/2017, 07-10/2017, 08-10/2017, 09-10/2017]

Answer 3

在不知道如何打印输出的情况下，我猜您使用的是datetoString()。

它有

Date today = Calendar.getInstance().getTime();
String result = df.format(today);
return result; // returns always today, not given date

也许应该有

String result = df.format(date) // the input ;
return result;

Answer 4

推荐使用java 8中的LocalDate 代码变得更简单，轻量级，无需从String来回转换。另外，您可以避免潜在的时区问题

public List<LocalDate> getDaysBetweenDates(Date startdate, Date enddate)
{
    LocalDate dateFrom  =stringToDaTe(mdateFrom).toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
    LocalDate dateTo  =stringToDaTe(mdateTo).toInstant().atZone(ZoneId.systemDefault()).toLocalDate();

    long days = Duration.between(dateFrom.atStartOfDay(), dateTo.atStartOfDay()).toDays();
    List<LocalDate> resultList= new ArrayList<LocalDate>();
    long i=0;
    do {
        resultList.add(dateFrom);
        dateFrom = dateFrom.plusDays(1);
        i++;

    } while (i < days+1);
    return resultList;      
}

获取2个日期之间的日期列表有错误

4 个答案: