Android Days between two dates

Question

I want to compare two dates for my Android application, but I got a really weird issue.

For example:

If I set the back in the past date to 127 days ago:

this.dateEvent = System.currentTimeMillis() - (127 * 24 * 3600 * 1000) 

And then compare it to the current date (Days between)

    Calendar sDate = getDatePart(new Date(this.dateEvent));     Calendar eDate = getDatePart(new Date(System.currentTimeMillis()));      int daysBetween = 0;     while (sDate.before(eDate))     {         sDate.add(Calendar.DAY_OF_MONTH, 1);         daysBetween ++;     }      while (sDate.after(eDate))     {         eDate.add(Calendar.DAY_OF_MONTH, 1);         daysBetween ++;     }      return daysBetween; 

It will return 22 which is not at all what was expected.

Did I make something wrong or is that an issue with the Calendar class ?

Answer 1

Here's a two line solution:

long msDiff = Calendar.getInstance().getTimeInMillis() - testCalendar.getTimeInMillis(); long daysDiff = TimeUnit.MILLISECONDS.toDays(msDiff); 

In this example it gets the number of days between date "testCalendar" and the current date.

Answer 2

Please refer this code, this may help you.

public String getCountOfDays(String createdDateString, String expireDateString) {     SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy", Locale.getDefault());      Date createdConvertedDate = null, expireCovertedDate = null, todayWithZeroTime = null;     try {         createdConvertedDate = dateFormat.parse(createdDateString);         expireCovertedDate = dateFormat.parse(expireDateString);          Date today = new Date();          todayWithZeroTime = dateFormat.parse(dateFormat.format(today));     } catch (ParseException e) {         e.printStackTrace();     }      int cYear = 0, cMonth = 0, cDay = 0;      if (createdConvertedDate.after(todayWithZeroTime)) {         Calendar cCal = Calendar.getInstance();         cCal.setTime(createdConvertedDate);         cYear = cCal.get(Calendar.YEAR);         cMonth = cCal.get(Calendar.MONTH);         cDay = cCal.get(Calendar.DAY_OF_MONTH);      } else {         Calendar cCal = Calendar.getInstance();         cCal.setTime(todayWithZeroTime);         cYear = cCal.get(Calendar.YEAR);         cMonth = cCal.get(Calendar.MONTH);         cDay = cCal.get(Calendar.DAY_OF_MONTH);     }       /*Calendar todayCal = Calendar.getInstance();     int todayYear = todayCal.get(Calendar.YEAR);     int today = todayCal.get(Calendar.MONTH);     int todayDay = todayCal.get(Calendar.DAY_OF_MONTH);     */      Calendar eCal = Calendar.getInstance();     eCal.setTime(expireCovertedDate);      int eYear = eCal.get(Calendar.YEAR);     int eMonth = eCal.get(Calendar.MONTH);     int eDay = eCal.get(Calendar.DAY_OF_MONTH);      Calendar date1 = Calendar.getInstance();     Calendar date2 = Calendar.getInstance();      date1.clear();     date1.set(cYear, cMonth, cDay);     date2.clear();     date2.set(eYear, eMonth, eDay);      long diff = date2.getTimeInMillis() - date1.getTimeInMillis();      float dayCount = (float) diff / (24 * 60 * 60 * 1000);      return ("" + (int) dayCount + " Days"); }