(a) General rule. In computing any period of time prescribed by this part, or by order of the Associate Director or Director, the date of the act or event that commences the designated period of time is not included. The last day so computed is included unless it is a Saturday, Sunday, or Federal holiday as set forth in 5 U.S.C. § 6103(a). When the last day is a Saturday, Sunday, or Federal holiday, the period runs until the end of the next day that is not a Saturday, Sunday, or Federal holiday. Intermediate Saturdays, Sundays, and Federal holidays are included in the computation of time, except when the time period within which an act is to be performed is ten days or less, not including any additional time allowed for in paragraph (c) of this section.

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(b) Filing or service of papers. Filing and service are deemed to be effective:

(1) In the case of personal service or same day commercial courier delivery, upon actual receipt by the person served;

(2) In the case of overnight commercial delivery service, U.S. Postal Service Express Mail delivery, or First Class, Registered, or Certified Mail, upon deposit in or delivery to an appropriate point of collection; or

(3) In the case of electronic transmission, including email, upon transmission.

(c) Calculation of time for service and filing of responsive papers. Whenever a time limit is measured by a prescribed period from the service of any notice or paper, the applicable time limits are calculated as follows:

(1) If service is made by U.S. Postal Service First Class, Registered, or Certified Mail, add three calendar days to the prescribed period;

(2) If service is made by Express Mail or overnight delivery service, add one calendar day to the prescribed period; or

(3) If service is made by electronic transmission, add one calendar day to the prescribed period.