TITLE XI: THE RECKONING OF TIME
Can. 202 §1 In law, a day is understood to be a space of twenty-four hours, to be reckoned continuously and, unless expressly provided otherwise, it begins at midnight; a week is a space of seven days a month is a space of thirty days, and a year a space of three hundred and sixty-five days, unless it is stated that the month and the year are to be taken as in the calendar.
§2 Unless the contrary is prescribed, the final day is to be reckoned within the
total; if the total time is one or more months, one or more years, one or more weeks, it
finishes on completion of the last day bearing the same number or, if the month does not
have the same number, on the completion of the last day of that month.