83. A time limit fixed by this Code, set by the court or agreed by the parties for the performance of an act or of a formality runs as of the act, event, decision or notification that gives rise to the time limit.
A time limit is counted by whole day or, if applicable, by month. If the time limit is expressed in days, the day that marks the start is not counted but the terminal day is. If the time limit is expressed in months, it expires on the day, in the last month, that bears the same calendar number as the day of the act, event, decision or notification having given rise to the time limit; if there is no such calendar number in that month, the time limit expires on the last day of the month.
A time limit expires at 12 midnight on the last day; a time limit that would normally expire on a Saturday or a holiday is extended until the following working day.