Re: Calendar - Roll by day bug?

"shakah" <>
4 Sep 2006 06:00:49 -0700
donlelel wrote:


Is it by design that roll by day doesnt change the month? If I roll one
day less and it gets to the point when it should decrease the month, it
just doesnt do it. Is there any other way to "roll" days in the year,
with a month change if necessary? Well, I'll rewrite the method bellow
to set the date by the number of the day in the year and check if
that's Mon, but I was just curious...

    public static Date MonOfWeek(Date aWeekDay) {
        //Calendar rightNow = Calendar.getInstance();
        GregorianCalendar rightNow = new GregorianCalendar();
        if (aWeekDay == null) {
            Trace("WARNING MonOfWeek Null date!");
            return rightNow.getTime();

        Trace("INFO MonOfWeek
        while (rightNow.MONDAY != rightNow.get(Calendar.DAY_OF_WEEK)) {

            int aYDay = rightNow.get(rightNow.DAY_OF_YEAR);

            Trace("INFO MonOfWeek rightNow=" + aYDay);
        Trace("INFO MonOfWeek
        return rightNow.getTime();

  Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=245
  Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=244
  Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=273
  Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=272
  Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=271
  Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=270
  Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=269
  Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=268
  Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=268

How about Calendar.add instead of roll:

public abstract void add(int field, int amount)

Date Arithmetic function. Adds the specified (signed) amount of time to
the given time field, based on the calendar's rules. For example, to
subtract 5 days from the current time of the calendar, you can achieve
it by calling:

  add(Calendar.DATE, -5).

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