calculate Month from Two Dates

int calculateMonth()
{
int month;

month = this.getOpenDate().getMonth() - this.getCloseDate().getMonth();
int year =  this.getCloseDate().getYear()-this.getOpenDate().getYear();
month = month + year*12;
this.setTime(month);

return month;

}



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public Date getCloseDate()
{
SimpleDateFormat ft = new SimpleDateFormat("dd/MM/yyyy");
Date dt = null;
try
{

dt =ft.parse( this.closeDate);
}

catch (ParseException e)
{

e.printStackTrace();
}
return dt;
}

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public void setCloseDate(String closeDate) 

{

this.closeDate = closeDate;

}