RSA 21:35: Time, How Reckoned; Days Included and Excluded.

I. Except where specifically stated to the contrary, when a period or limit of time is to be reckoned from a day or date, that day or date shall be excluded from and the day on which an act should occur shall be included in the computation of the period or limit of time.

II. If a statute specifies a date for filing documents or paying fees and the specified date falls on a Saturday, Sunday, or legal holiday, the document or fee shall be deemed timely filed if it is received by the next business day.