(1) If a period has been fixed by the week, month or year, it shall be computed according to the calendar.
(2) If a period does not commence at the beginning of a week, month or year, such period shall mature on the day in the last week, month or year preceding the day corresponding to that which it commenced.
(3) In cases where a period has been fixed by the month or year, if there is no corresponding day in the last month, the last day of the month shall be the day of maturity.