android-calculate the number of days between two dates

To calculate the number of days between two dates, you must convert the two dates to a uniform timestamp, and then calculate their millisecond difference and change the millisecond difference to days.

System.out.print ("Start Time:"); String str1= BeginTime;//"YYYYMMDD" format such as 20131022System.out.println ("\ n End Time:"); String str2= _endtime;//"YYYYMMDD" format such as 20131022SimpleDateFormat SimpleDateFormat =NewSimpleDateFormat ("YyyyMMdd");//Enter a date formatDate date1 =NULL; Try{date1=Simpledateformat.parse (STR1); } Catch(ParseException e) {e.printstacktrace (); } Date date2=NULL; Try{date2=Simpledateformat.parse (STR2); } Catch(ParseException e) {e.printstacktrace (); } GregorianCalendar Cal1=NewGregorianCalendar (); GregorianCalendar Cal2=NewGregorianCalendar ();            Cal1.settime (date1);            Cal2.settime (DATE2); DoubleDaycount = (Cal2.gettimeinmillis ()-Cal1.gettimeinmillis ())/(1000 * 3600 * 24);//change from millisecond to interval number of daysSystem.out.println ("\ n Difference" + Daycount + "Day");

Excerpt from: http://www.2cto.com/kf/201310/252189.html

android-calculate the number of days between two dates