5501.1 In computing any period of time prescribed or allowed by these rules or by any applicable statute, the day of the act, event, or default from which the designated period of time begins to run shall not be included.

5501.2 The last day of the computed period shall be included unless it is a Saturday, Sunday, or legal holiday, in which event the period shall run until the end of the next day which is not a Saturday, Sunday, or legal holiday.

5501.3 When the period of time prescribed or allowed is less than seven (7) days, intermediate Saturdays, Sundays, and legal holidays shall be excluded from the computation unless an applicable statute expressly provides otherwise.

5501.4 For the purposes of this chapter, "legal holiday" includes the following:

1. (a) New Year's Day;
2. (b) Martin Luther King's Birthday;
3. (c) President's Day;
4. (d) District of Columbia Emancipation Day;
5. (e) Memorial Day;
6. (f) Independence Day (4th of July);
7. (g) Labor Day;
8. (h) Columbus Day;
9. (i) Veterans Day;
10. (j) Thanksgiving Day;
11. (k) Christmas Day; and
12. (l) Any other day designated a legal holiday by the President of the United States or the District of Columbia government.

5501.5 When an act is required or allowed to be done at or within a specified time, the Board may at any time in its discretion and for cause shown, do either of the following:

(a) With or without motion or notice, order the period enlarged, if a request for enlargement of time is made before the expiration of the period originally prescribed or as extended by a previous order; or

(b) Upon motion made after the expiration of the specified period, permit the act to be done where the failure to act was the result of excusable neglect.

SOURCE: Final Rulemaking published at 60 DCR 747 (January 25, 2013).