N.Y. Dom. Rel. Law § 203

§ 203. Judgment for separation revocable. Upon the joint application\nof the parties, accompanied with satisfactory evidence of their\nreconciliation, a judgment for a separation, forever, or for a limited\nperiod, rendered as prescribed in this article, may be revoked at any\ntime by the court which rendered it, subject to such regulations and\nrestrictions as the court thinks fit to impose.\n