Пример #1
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  /**
   * Creates a new date by adding the specified number of months to the base date.
   *
   * <p>If the base date is close to the end of the month, the day on the result may be adjusted
   * slightly: 31 May + 1 month = 30 June.
   *
   * @param months the number of months to add (can be negative).
   * @param base the base date.
   * @return a new date.
   */
  public static SerialDate addMonths(final int months, final SerialDate base) {

    final int yy = (12 * base.getYYYY() + base.getMonth() + months - 1) / 12;
    final int mm = (12 * base.getYYYY() + base.getMonth() + months - 1) % 12 + 1;
    final int dd = Math.min(base.getDayOfMonth(), SerialDate.lastDayOfMonth(mm, yy));
    return SerialDate.createInstance(dd, mm, yy);
  }
Пример #2
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  /**
   * Creates a new date by adding the specified number of years to the base date.
   *
   * @param years the number of years to add (can be negative).
   * @param base the base date.
   * @return A new date.
   */
  public static SerialDate addYears(final int years, final SerialDate base) {

    final int baseY = base.getYYYY();
    final int baseM = base.getMonth();
    final int baseD = base.getDayOfMonth();

    final int targetY = baseY + years;
    final int targetD = Math.min(baseD, SerialDate.lastDayOfMonth(baseM, targetY));

    return SerialDate.createInstance(targetD, baseM, targetY);
  }
Пример #3
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 /**
  * Rolls the date forward to the last day of the month.
  *
  * @param base the base date.
  * @return a new serial date.
  */
 public SerialDate getEndOfCurrentMonth(final SerialDate base) {
   final int last = SerialDate.lastDayOfMonth(base.getMonth(), base.getYYYY());
   return SerialDate.createInstance(last, base.getMonth(), base.getYYYY());
 }