android - Unparseable date. Parse Exception comparing two dates -

i trying produce list based on date. keep getting parse exception. thought had dates in exact same format. maybe missed something. have played hours no success. appreciated.

public static list<string> getmonthlydates(date startdate, date enddate) {     list<string> dates = new arraylist<string>();     calendar calendar = new gregoriancalendar();       calendar.settime(startdate);      while (calendar.gettime().before(enddate)) {         simpledateformat df = new simpledateformat("yyyy-mm-dd");         string result = df.format(calendar.gettime());         dates.add(result);         calendar.add(calendar.month, 1);     }     return dates; }  calendar mcalendar = calendar.getinstance(); string dd = editbillduedate.gettext().tostring();      //which shows correctly in format of 2015-jun-15  simpledateformat  format = new simpledateformat("yyyy-mm-dd");       //it makes no difference if format yyyy-mm-dd date date;         try {  //this line below getting error             date = format.parse(dd);             mcalendar.add(calendar.day_of_year, 365);             final date newdate2 = mcalendar.gettime();              list<string> datelist = getmonthlydates(date, newdate2);              (final string d1 : datelist) {             //does irrelevant              }             } catch (parseexception e) {             // todo auto-generated catch block             e.printstacktrace();             } 

if want parse dates in same format 2015-jun-15, should change simpledateformat have 3 characters month element this: yyyy-mmm-dd. change :

simpledateformat  format = new simpledateformat("yyyy-mm-dd");  

to:

simpledateformat  format = new simpledateformat("yyyy-mmm-dd");  

and this:

simpledateformat df = new simpledateformat("yyyy-mm-dd"); 

to:

simpledateformat df = new simpledateformat("yyyy-mmm-dd");