05- 071 C.M.R. ch. 4, § A-12
When these regulations established any time limit for the filing, submission, or production of any document, record, file or other possible source of evidence, or for the filing of any request with the Commission, such item must be received in the office of the Commission before the close of business on the last day of the time limit.
In computing any period of time prescribed or allowed by this rule, the day of the act, event, or default from or after which the designated period of time begins to run shall not he included. The last day of the period shall be included, unless it is a Saturday, Sunday, or legal state or federal holiday, in which event the period shall run until the end of the next day that is not a Saturday, Sunday, or legal state or federal holiday.
The Commission's Executive Director or her/his designee, or the Commission, may extend any time limit established in this chapter for good cause shown, and shall notify the parties of any such extension.
05- 071 C.M.R. ch. 4, § A-12