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Java Events Calendar January 31st

I have the following code: -

        Calendar calc = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat("MMM-yyyy");
        calc.set(Calendar.YEAR, calc.get(Calendar.YEAR) - 1);
        calc.set(Calendar.MONTH, Calendar.NOVEMBER);
        System.out.println("---NOV? : " + sdf.format(calc.getTime()));

        Calendar calc1 = Calendar.getInstance();
        calc1.set(Calendar.YEAR, calc1.get(Calendar.YEAR) - 1);
        calc1.set(Calendar.MONTH, Calendar.DECEMBER);
        System.out.println("-- DEC : " + sdf.format(calc1.getTime()));

Output of the above code: -

> ---NOV? : Dec-2012
> -- DEC : Dec-2012

This only happens on January 31st, can anyone explain why this might be happening?

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2 answers


The calendar is set up for a soft interpretation, so if you tell it to the 31st day of November, well, November only has 30 days, so it will roll over until December 1st.



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I suspect that the first case is being rounded from November 31st to "December 1st" since you are not changing the day on your calendar.



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