CODEWITHSUNDEEP
javasortingdatejodatime
chrisgiffy
chrisgiffy

Reputation: 150

Collections.sort(<StringDate>, new Comparator) is not comparing the dates properly

I have a List of dates in dd.MM.YYYY HH:mm format stored as a string When I try to sort these dates I get all the values sorted properly except for the 00 hours and 12 hours values

The array comes in a 15 minute interval so after sorting i get something like

00:15, 12:15, 00:30, 12:30, 00:45, 12:45, 1:00, 1:15, 1:30....

Below is the code for the sorting

Collections.sort(dates, new Comparator<String>() {
            DateFormat f = new SimpleDateFormat("dd.MM.yyyy hh:mm");
            @Override
            public int compare(String o1, String o2) {
                try {
                    return f.parse(o1).compareTo(f.parse(o2));
                } catch (ParseException e) {
                    throw new IllegalArgumentException(e);
                }
            }
        });

Please help me out here how do i go ahead with this

Upvotes: 1

Views: 472

Answers (1)

Robby Cornelissen
Robby Cornelissen

Reputation: 97202

In your SimpleDateFormat, use HH for hours instead of hh:

DateFormat f = new SimpleDateFormat("dd.MM.yyyy HH:mm");

As mentioned in the documentation:

H   Hour in day (0-23)
h   Hour in am/pm (1-12)

Upvotes: 2

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