How to find difference two dates on android app

Question

Possible Duplicate:
Calculate date/time difference in java

I am a new on Android and I want to make a new app for me. I want to subtruct two dates (dd/mm/yyyy) format by using currentDate. For example I want to find the differences of the days between 01/02/2013 and currentDate. How can I do it?

Ram kiran Pachigolla · Accepted Answer · 2012-10-16T02:52:47.803

20

SimpleDateFormat dfDate  = new SimpleDateFormat("dd/MM/yyyy");
    java.util.Date d = null;
    java.util.Date d1 = null;
    Calendar cal = Calendar.getInstance();
    try {
            d = dfDate.parse("01/02/2012 ");
            d1 = dfDate.parse(dfDate.format(cal.getTime()));//Returns 15/10/2012
        } catch (java.text.ParseException e) {
            e.printStackTrace();
        }

    int diffInDays = (int) ((d.getTime() - d1.getTime())/ (1000 * 60 * 60 * 24));
    System.out.println(diffInDays);

Check Ex1 and Ex2 for more detailed example

edited Oct 16 '12 at 02:52

answered Oct 15 '12 at 09:03

Ram kiran Pachigolla

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01/02/2013 date is fix date but I dont want to fix current date in my code by hand. I want that when I run the app, it takes the current date from system and it calculate dhe diffirences. How can I get the current date from system and fix in the code? – Çağatay Aktaş Oct 15 '12 at 09:10
i changed the code, check it again – Ram kiran Pachigolla Oct 15 '12 at 09:11
thanx so much. i hope it runs – Çağatay Aktaş Oct 15 '12 at 09:13
That's fine buddy. enjoy the day – Ram kiran Pachigolla Oct 15 '12 at 09:15
when I run this code I face the null pointer exception. why? – Çağatay Aktaş Oct 15 '12 at 14:30

score 1 · Answer 2 · answered Oct 15 '12 at 09:16

You may take a look into DateUtils, that offers some utility methods to compute elapsed time between two dates, but only for representation. Do not use the direct approach to convert between days/milliseconds since it does not take into consideration leap years, leap seconds, summer/winter time changes, etc. Those considerations are handled by Calendar classes.

Update You can use Joda library to perform relative date and time calculations like the one you need.

How to find difference two dates on android app

2 Answers2