class TsPeriod implements Serializable, Cloneable, IPeriod,
        Comparable<TsPeriod> {

    public boolean isBefore(final Date date) {
        return isBefore(new Day(date));
    }

    public  TsPeriod(final TsFrequency frequency);
    public  TsPeriod(final TsFrequency frequency, final Date date);
    public  TsPeriod(final TsFrequency frequency, final Day day);
      TsPeriod(final TsFrequency frequency, final int id);
    public  TsPeriod(final TsFrequency frequency, final int year,
            final int position);
    public  TsPeriod(final TsFrequency frequency, final TsPeriod p);

}