Calculate Yesterday's Date

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

Code:

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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

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Yesterday, however, it calculated 083104 instead of 073104.

Anyone know of a more accurate method?

It's pretty stupid that Calendars getTime() returns a Date object
when most of the methods within the Date class are deprecated.
Anyway.....

Code:

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import java.util.*;
 import java.text.*;

 public class CalDate{
  public static void main(String[] args){
    Calendar  gc;
    Date  curDate;
    String  strCurDate = null;
    String fileDate = new String();
    SimpleDateFormat sdf2 = new SimpleDateFormat("MMddyy");
    gc = GregorianCalendar.getInstance();

    curDate = gc.getTime();
    fileDate = sdf2.format(curDate);
    System.out.println(fileDate);

    gc.setTimeInMillis(gc.getTimeInMillis() - 86400000);

    curDate = gc.getTime();
    fileDate = sdf2.format(curDate);
    System.out.println(fileDate);
  }
 }

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Eclipse doesn't like

Code:

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gc.setTimeInMillis

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I found this code that I had for another old project that I'll try and modify:

Code:

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import java.text.SimpleDateFormat;
import java.util.*;
import java.text.*;

public class DateTest
{

    public static void main(String[] args)
    {
                for(int i = 0;i<365;i++)
                {
                    System.out.println(DateRoller("20040804",i));
                }
    }
    public static String DateRoller(String strDate, int intDaysToRoll)
    {
            java.util.Date  curDate;
            SimpleDateFormat sdf2 = new SimpleDateFormat ("yyyyMMdd");
            Date dtTemp = new Date();               
            try
            {
                    dtTemp = sdf2.parse(strDate);                       
            }
            catch(ParseException e){}
           
            int y = dtTemp.getYear()+1900;
            int m = dtTemp.getMonth();
            int d = dtTemp.getDate();
            java.util.GregorianCalendar rcal = new GregorianCalendar(y,m,d);
            curDate = rcal.getTime ( );
            long msYDate = 0;
            long msCDate = curDate.getTime();
            msYDate = msCDate;
            //Transforms the current date into miliseconds
            for(int i = 0;i<intDaysToRoll;i++)
            {
                    msYDate = msYDate - 86400000; // Subtracts off X day's worth of miliseconds
            }
            java.util.Date yestDate = new java.util.Date (msYDate);                       
            return sdf2.format(yestDate);
    } //End DateRoller
}

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