Selenium java Date Conversion

public statis dateconversion(String date)
{
String ss="";
Calendar cal= Calendar.getInstance();
int day = cal.get(Calendar.DATE);
int month= cal.get(Calendar.MONTH);
int year= cal.get(Calendar.YEAR);
int n=Integer.parseInt(date);
Date d=new Date(year,month,day);
d.setDate(d.getDate()+n);
ss=d.getDate()+"-"+(d.getMonth()+1)+"-"+d.getYear();
return ss;
}