A "working day" in the context of laytime in a day on which cargo operations are carried out in the usual manner in a port and without extra payment such as for overtime. If a day on which work is carried out but at overtime or "penalty" rates, such a day may be called a "non-working". A non-working day may or may not be counted as laytime, depending on the words in the charterparty. A non-working day is not normally a "holiday" or a day of rest unless it is actually a day with such attributes. For getting further clarifications on these items one may refer to the VOYLAY Rules 1993 which provides standard explanations accepted by both parties in the charter.