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This is the full Active Objects library, if you don't know which one to use, you probably want this one.

There is a newer version: 6.1.1

package net.java.ao.util;

import net.java.ao.ActiveObjectsException;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public final class DateUtils {
    static {
        MAX_DATE = newDate(9999, 12, 31);
    }

    public static final Date MAX_DATE;

    public static DateFormat newDateFormat(String pattern) {
        return new SimpleDateFormat(pattern);
    }

    public static Calendar checkAgainstMaxDate(Calendar c) {
        checkAgainstMaxDate(c.getTime());
        return c;
    }

    public static Date checkAgainstMaxDate(Date date) {
        if (date.compareTo(MAX_DATE) > 0) {
            throw new ActiveObjectsException("Default date value must be strictly before " + MAX_DATE);
        }
        return date;
    }

    private static Date newDate(int year, int month, int dayOfMonth) {
        return newCalendar(year, month, dayOfMonth).getTime();
    }

    private static Calendar newCalendar(int year, int month, int dayOfMonth) {
        final Calendar c = Calendar.getInstance();
        c.set(Calendar.YEAR, year);
        c.set(Calendar.MONTH, month - 1);
        c.set(Calendar.DAY_OF_MONTH, dayOfMonth);
        c.set(Calendar.MILLISECOND, 0);
        return c;
    }
}