java - Android : date format in a String -

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Due to the format of these dates, there is a problem sorting my date.

I receive the date: 

  last calendar c = calendar.Ast Instance (); Mayer = C. Gate (Calendar: IEER); MMonth = c.get (calendar .mONTH); Mday = c.get (Calendar DAY_OF_MONTH);   
 And I create the string with these values.   dateRappDB = (new stringbuilder () .append (mYear) .append (".") Append (MMONTH + 1). APPEND ("."). APPEND (MDA). APPEND "")). Toasting ();   
 The problem is that if the month is for February then the MMOUT value is 2. Therefore dates from the months like October (10) dates before my list.  
 What do I need that the day and day are made like MM and DD but I do not know how to do it in my case.  
  Edit :  
  I resolved the problem using a date format   
 I It has changed:  
  dateRappDB = (new stringbilder) .append (mYear) .append (".") .append (mMonth + 1) .append (".") .append (MDay) .append ("")) ToString (); From   
 From:  
  Date Date = New Date (MAYYAR - 1900, MM, MDA); DateFacDB = DateFormat.format ("yyyy.MM.dd", date) .toString ();   
 And it works thanks to all of you for your help :)   
 
 
 An easy way to convert a date to a string is:  
  SimpleDateFormat simpleDate = New SimpleDateFormat (" dd / MM / yyyy ");   
  string strDt = simpleDate.format (dt);

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