(a) In computing any time period provided for by this part, or any order issued under this part, the time begins with the day following the act, event, or default, and includes the last day of the period, unless that day is a Saturday, Sunday, or Federal holiday, in which case it includes the next business day.

(b) When the applicable time period is less than seven days, intermediate Saturdays, Sundays, and Federal holidays will be excluded from the computation.