N.Y. General Construction Law § 25
act is due on Saturday, Sunday or public holiday. 1. Where a contract by its terms authorizes or requires the payment of money or the performance of a condition on a Saturday, Sunday or a public holiday, or authorizes or requires the payment of money or the performance of a condition within or before or after a period of time computed from a certain day, and such period of time ends on a Saturday, Sunday or a public holiday, unless the contract expressly or impliedly indicates a different intent, such payment may be made or condition performed on the next succeeding business day, and if the period ends at a specified hour, such payment may be made or condition performed, at or before the same hour of such next succeeding business day, with the same force and effect as if made or performed in accordance with the terms of the contract.