Calendar Month - A "month" in a time charter usually means a calendar month, which extends from the given day of the month to the day of corresponding number in next month. If that next month, being shorter, does not have a day of that number, the calendar month expires on the last day of that month. For example, if a ship is delivered on August 31st, the 1st month's hire expires September 30th; the next month's hire would be payable on October 31st, not October 30th.
Canal Transit Dues - Charge levied by a canal authority, such as that for the Suez Canal, for transiting. This charge is based on the ship's tonnage.