In computing a period of time allowed or prescribed by law or by order of court, the date of the act, event, or default after which the period begins to run is not to be included. The last day of the period is to be included, unless it is a legal holiday, in which event the period runs until the end of the next day which is not a legal holiday.

A half-holiday is considered as a legal holiday.

A legal holiday is to be included in the computation of a period of time allowed or prescribed, except when: