New York Consolidated Laws, General Construction Law - GCN § 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.