How we can find currentDate is in date range or not

Question

I get three dates: From date, To date and current date.

I want to find whether current date is in between From and To dates. If current date is in between these two dates then I want to create two new From and To dates.

Example:

• From Date = 15 march
• To Date = 25 march
• current date = 21 march

Expected result should be:

1. From Date= 15 march, To Date=21 march
2. From date= 21 march, To Date=25 march

To implement this logic I want to check my current date status whether it's in middle of date range or it's before or after.

Answer 1

You said in the comments that your inputs are "in date format", but that's a very vague description, because, technically speaking, Date objects don't have a format.

If your inputs are instances of java.util.Date, then just use the methods before, after and equals to compare the dates.

If you're using Java 8, the java.time API is a much better choice. You can either use a java.time.LocalDate or even a java.time.MonthDay, if you don't care about the year.

Both classes have comparison methods: isAfter, isBefore and equals, and a now() method to get the current date. With those, you have all the tools to implement your logic.

Answer 2

Try something like this :

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

    DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    String dateString1 = "2017-02-15";
    String dateString2 = "2015-03-12";
    String dateString3 = "2016-07-19";
    Date date1 = null,date2=null,date3=null;

    try {
        date1 = sdf.parse(dateString1);
        date2 = sdf.parse(dateString2);
        date3 = sdf.parse(dateString3);
    } catch (ParseException e) {
        e.printStackTrace();
    }


    dates.add(date1);
    dates.add(date2);
    dates.add(date3);

    Collections.sort(dates, new Comparator<Date>() {
        public int compare(Date d1, Date d2) {
            return d1.compareTo(d2);
        }
    });