JVerein

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import java.util.Calendar;
import java.util.GregorianCalendar;


public class TestZeitfenster2 {

    public static void main(String[] args) {

        for (int year = 0; year< 100; year++) {
            int newYear = computeYear(year);

            System.out.println("Jahr " + year + " --> " + newYear);
        }
    }

    private static int computeYear(final int testYear) {

        final Calendar cal           = new GregorianCalendar();
        final int changeOfYear       = 30;
        final int currentYear        = cal.get(Calendar.YEAR);           // z.B. 2105
        final int yearRoundedHundred = currentYear / 100 * 100;          // z.B. 2100
        final int currentYearShort   = currentYear - yearRoundedHundred; // z.B. 5 anstatt 2105

        int year = testYear;

        /* Anpassungen des Datums */
        if (year < 100) {
            if (year > currentYearShort) {

                if (year - currentYearShort > changeOfYear) {
                    year = yearRoundedHundred - 100 + year;
                } else {
                    year = yearRoundedHundred + year;
                }

            } else {

                if (currentYearShort - year > 100 - changeOfYear) {
                    year = yearRoundedHundred + 100 + year;
                } else {
                    year = yearRoundedHundred + year;
                }
            }
        }

        return year;
    }
}