Calculate Yesterday's Date

[rockies1]

I have the following code for calculating yesterday's date:

public static String CalcYestDate()
{
	//Set up date to run for
	java.util.Calendar  gc;
	java.util.Date  curDate;
	String  strCurDate = null;
	String fileDate = new String();

	gc = GregorianCalendar.getInstance ( ); // Gets the current Calendar instance
	gc.roll(gc.DATE,false);
	
	curDate = gc.getTime ( ); // Gets the Date time part of gc
	SimpleDateFormat sdf2 = new SimpleDateFormat ( "MMddyy" ); //sets up the correct format for the date
	fileDate = sdf2.format ( curDate );  //Changes the date into the correct date format
			
	return(fileDate);
}//End CalcYestDate

Yesterday, however, it calculated 083104 instead of 073104.

Anyone know of a more accurate method?