Section 25-A. Public holiday, Saturday or Sunday in statutes; extension of time where performance of act is due on Saturday, Sunday or public holiday

1. When any period of time, computed from a certain day, within
  which or after which or before which an act is authorized or required to
  be done, ends on a Saturday, Sunday or a public holiday, such act may be
  done  on  the  next  succeeding business day and if the period ends at a
  specified hour, such act may be done at or before the same hour of  such
  next  succeeding  business  day,  except  that  where  a  period of time
  specified by contract ends on a Saturday, Sunday or  a  public  holiday,
  the  extension of such period is governed by section twenty-five of this
  chapter.
    2. Where time is extended by virtue of the provisions of this section,
  such extended time shall not be included in the computation of interest,
  except that when the period is specified as a  number  of  months,  such
  extended time shall be included in the computation of interest.